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Connecticut Hydrography Line
SDE Feature Class - depgis.DEP.HYDROGRAPHY_LINE
FGDC, ESRI Metadata
DescriptionGraphicSpatialData StructureData QualityData SourceData DistributionMetadata
+ Resource Description
Citation
Information used to reference the data.
Title: Connecticut Hydrography Line
Originators: State of Connecticut, Department of Environmental Protection (data editor and publisher)
U.S. Geological Survey, National Mapping Program (data compiler)
Publisher: State of Connecticut, Department of Environmental Protection
Publication place: Hartford, Connecticut, USA
Publication date: 19940101
Edition: 2005
Data type: vector digital data
Data location: http://www.ct.gov/deep
Other citation details:
The USGS is the collector of the data (compiler). The State of Connecticut, Department of Environmental Protection is the creator and maintainer of the data layer (editor) and producer (publisher) of this information for use. The 2005 Edition essentially includes the same set of geographic features published in 1994. However, the 2005 Edition differs from information published in 1994 primarily as a result of corrections and improvements to feature geometry and feature attribute information. Previously undetected errors have been corrected. Also, some feature attribute information (data fields) have been slightly modified and made easier to use. Except for periodic corrections, this layer includes information that is relatively static and does not change over time. Data compiled at 1:24,000 scale.
Description
A characterization of the data, including its intended use and limitations.
Abstract:
Connecticut Hydrography Line includes the line features of a layer named Hydrography. Hydrography is a 1:24,000-scale, polygon and line feature-based layer that includes all hydrography features depicted on the U.S. Geological Survey (USGS) 7.5 minute topographic quadrangle maps for the State of Connecticut. This layer only includes features located in Connecticut. These hydrography features include waterbodies, inundation areas, marshes, dams, aqueducts, canals, ditches, shorelines, tidal flats, shoals, rocks, channels, and islands. Hydrography is comprised of polygon and line features. Polygon features represent areas of water for rivers, streams, brooks, reservoirs, lakes, ponds, bays, coves, and harbors. Polygon features also depict inundation areas, marshes, dams, aqueducts, canals, tidal flats, shoals, rocks, channels, and islands shown on the USGS 7.5 minute topographic quadrangle maps. Line features represent single-line rivers and streams, aqueducts, canals, and ditches. Line features also enclose all polygon features in the form of natural shorelines, manmade shorelines, dams, closure lines separating adjacent waterbodies, and the apparent limits for tidal flats, rocks, and areas of marsh. The layer is based on information from USGS topographic quadrangle maps published between 1969 and 1984 so it does not depict conditions at any one particular point in time. Also, the layer does not reflect recent changes with the course of streams or location of shorelines impacted by natural events or changes in development since the time the USGS 7.5 minute topographic quadrangle maps were published. Attribute information is comprised of codes to identify hydrography features by type, cartographically represent (symbolize) hydrography features on a map, select waterbodies appropriate to display at different map scales, identify individual waterbodies on a map by name, and describe feature area and length. The names assigned to individual waterbodies are based on information published on the USGS 7.5 minute topographic quadrangle maps or other state and local maps. The layer does not include bathymetric, stream gradient, water flow, water quality, or biological habitat information. This layer was originally published in 1994. The 2005 edition includes the same water features published in 1994, however some attribute information has been slightly modified and made easier to use. Also, the 2005 edition corrects previously undetected attribute coding errors.
Purpose:
Connecticut Hydrography is 1:24,000-scale base map data. It depicts all of the hydrography information published on the USGS topographic quadrangle maps. For base map purposes, use this layer with other 1:24,000-scale base map data such as Roads and Trails, Railroads, Airports, and Towns. This layer may be used as a possible data source for other 1:24,000-scale layers with features that must coincide and line up with stream and shoreline features published on the USGS topographic quadrangle maps. For example, the layer includes a set of connecting line features referred to as Coastline Arcs, which define a shoreline between the Connecticut landmass and Long Island Sound. These Coastline Arc features are commonly used to close polygon features in other 1:24,000-scale layers published by the State of Connecticut, Department of Environmental Protection. For example, Coastline Arcs from the original Hydrography Master layer define the shoreline in the Waterbody, Named Waterbody, Towns, Basins, and Bedrock Geology layers. Note that related hydrography layers such as Waterbody, Waterbody Master, Named Waterbody, Named Waterbody Master, and Hydrography are all ultimately derived from the polygon and line features of the Hydrography Master layer. Typically, layers derived from Hydrography Master define a subset of polygon and line features for either the geographic area encompassed by all USGS topographic quadrangle maps that cover the State of Connecticut (a master layer) or the geographic area of the State of Connecticut, in which case the layer is clipped to the State boundary. The Hydrography layer is not intended for maps printed at map scales greater or more detailed than 1:24,000 scale (1 inch = 2,000 feet.)
Supplemental information:
In 2004, the State of Connecticut Department of Environmental Protection developed automated procedures to systematically maintain feature topology and attribute integrity for a set of related hydrography data maintained by the agency. These layers include Hydrography Master, Hydrography, Waterbody Master, Waterbody, Named Waterbody Master, and Named Waterbody. Automated procedures were developed using ArcInfo Workstation 8.3 software and the Arc Macro Language (AML) as a scripting environment and recorded in an AML file named MAKECOVER.AML for the hydrography category of data for the State of Connecticut, Department of Environmental Protection. The MAKECOVER.AML derives all related hydrography layers from one Hydrography Master layer. For additional information related to the original source of data from the U.S. Geological Survey, refer to the Data User Guides and Standards for 1:24,000-Scale Digital Line Graphs and Quadrangle Maps available from the U.S. Geological Survey, National Mapping Program.
Dataset credit:
The named waterbody information incorporated into the Hydrography, Waterbody and Named Waterbody layers was originally compiled and mapped by James Bogar, a Cartographer with the State of Connecticut, Department of Environmental Protection.
Language of dataset: en
Point Of Contact
Contact information for the individual or organization that is knowledgeable about the data.
Organization: State of Connecticut, Department of Environmental Protection
Person: Howie Sternberg
Phone: 860-424-3540
Fax: 860-424-4058
Email: dep.gisdata@po.state.ct.us
Hours of service: Monday to Friday, 08:30 to 16:30 Eastern Standard Time
Address type: mailing and physical address
Address:
79 Elm Street
City: Hartford
State or Province: Connecticut
Postal code: 06106
Country: USA
Data Type
How the data are represented, formatted and maintained by the data producing organization.
File or table name: depgis.DEP.HYDROGRAPHY_LINE
Data type: vector digital data
Data format: SDE Feature Class
Native dataset environment: These data are maintained by the State of Connecticut using ArcGIS software developed by Environmental Systems Research Institute (ESRI) in a Microsoft Windows operating system environment.
Time Period of Data
Time period(s) for which the data corresponds to the currentness reference.
Beginning date: 1969
Ending date: 1984
Currentness reference:
Publication dates of the USGS 7.5 minute topographic quadrangle maps for the State of Connecticut through 1984.
Status
The state of and maintenance information for the data.
Data status: Complete
Update frequency: None planned
Key Words
Words or phrases that summarize certain aspects of the data.
Theme:
Keywords: digital line graph, DLG, large scale, hydrography, river, stream, lake, pond, water, waterbody, base map
Keyword thesaurus: None
Theme:
Keywords: inlandWaters
Keyword thesaurus: ISO 19115 Topic Category
Place:
Keywords: Connecticut, CT
Keyword thesaurus: U.S. Department of Commerce, 1987, Codes for the Identification of the States, the District of Columbia and the Outlying Areas of The United States, and Associated Areas (Federal Information Processing Standard 5-2): Washington, DC, National Institute of Standards and Technology.
Place:
Keywords: United States of America, USA
Keyword thesaurus: U.S. Department of Commerce, 1995, Countries, Dependencies, Areas of Special Sovereignty, and Their Principal Administrative Divisions (Federal Information Processing Standard (FIPS) 10-4): Washington, D.C., National Institute of Standards and Technology.
Data Access Constraints
Restrictions and legal prerequisites for accessing or using the data after access is granted.
Access constraints:
None. The data is in the public domain and may be redistributed.
Use constraints:
No restrictions or legal prerequisites for using the data. The data is suitable for use at appropriate scale, and is not intended for maps printed at scales greater or more detailed than 1:24,000 scale (1 inch = 2,000 feet). Although this data set has been used by the State of Connecticut, Department of Environmental Protection, no warranty, expressed or implied, is made by the State of Connecticut, Department of Environmental Protection as to the accuracy of the data and or related materials. The act of distribution shall not constitute any such warranty, and no responsibility is assumed by the State of Connecticut, Department of Environmental Protection in the use of these data or related materials. The user assumes the entire risk related to the use of these data. Once the data is distributed to the user, modifications made to the data by the user should be noted in the metadata. When printing this data on a map or using it in a software application, analysis, or report, please acknowledge the State of Connecticut, Department of Environmental Protection and the U.S. Geological Survey, National Mapping Program as the source for this information. For example, include the following data source description when printing this layer on a map: Hydrography - From the Hydrography layer, compiled and published by CT DEP and USGS. Source map scale is 1:24,000.
+ Graphic Example
Browse Graphic
Graphic illustration of the data.
Browse graphic 1
Open - Full view of Connecticut Hydrography polygon and line features
Graphic Image

Browse graphic 2
Open - Detail view of Connecticut Hydrography polygon and line features
Graphic Image

Browse graphic 3
Open - View of Connecticut Hydrography at a map scale appropriate for displaying a subset of hydrography polygon and line features defined by scalelevel <= 1.
Graphic Image

Browse graphic 4
Open - View of Connecticut Hydrography at a map scale appropriate for displaying a subset of hydrography polygon and line features defined by scalelevel <= 2.
Graphic Image

Browse graphic 5
Open - View of Connecticut Hydrography at a map scale appropriate for displaying a subset of hydrography polygon and line features defined by scalelevel <= 3.
Graphic Image

Browse graphic 6
Open - View of Connecticut Hydrography at a map scale appropriate for displaying a subset of hydrography polygon and line features defined by scalelevel <= 4.
Graphic Image

Browse graphic 7
Open - View of Connecticut Hydrography at a map scale appropriate for displaying a subset of hydrography polygon and line features defined by scalelevel <= 5.
Graphic Image

Browse graphic 8
Open - View of Connecticut Hydrography at a map scale appropriate for displaying a subset of hydrography polygon and line features defined by scalelevel <= 6.
Graphic Image

Browse graphic 9
Open - View of Connecticut Hydrography at a map scale appropriate for displaying a subset of hydrography polygon and line features defined by scalelevel <= 7.
Graphic Image

Browse graphic 10
Open - View of Connecticut Hydrography at a map scale appropriate for displaying a subset of hydrography polygon and line features defined by scalelevel <= 7 with waterbody name labels from the Connecticut Geographic Names layer.
Graphic Image
+ Spatial Reference Information
Horizontal Coordinate System
Reference system from which linear or angular quantities are measured and assigned to the position that a point occupies.
Projected coordinate system:
Name: NAD 1983 StatePlane Connecticut FIPS 0600 Feet
Map units: survey feet
Geographic coordinate system:
Name: GCS North American 1983
Coordinate System Details
Map projection
Map projection name: Lambert Conformal Conic
Standard parallel: 41.200000
Standard parallel: 41.866667
Longitude of central meridian: -72.750000
Latitude of projection origin: 40.833333
False easting: 999999.999996
False northing: 499999.999998
Planar Coordinate Information
Planar coordinate encoding method: coordinate pair
Coordinate representation:
Abscissa resolution: 0.000250
Ordinate resolution: 0.000250
Planar distance units: survey feet
Geodetic model
Horizontal datum name: North American Datum of 1983
Ellipsoid name: Geodetic Reference System 80
Semi-major axis: 6378137.000000
Denominator of flattening ratio: 298.257222
Vertical Coordinate System
Reference system from which vertical distances (altitudes or depths) are measured.
Altitude system definition:
Altitude resolution: 1.000000
Altitude encoding method: Explicit elevation coordinate included with horizontal coordinates
Spatial Domain
The geographic areal domain of the data that describes the western, eastern, northern, and southern geographic limits of data coverage.
Bounding Coordinates
In Projected or local coordinates
NAD 1983 StatePlane Connecticut FIPS 0600 Feet
BoundaryCoordinate
Left731994.625000 (survey feet)
Right1263065.875000 (survey feet)
Top944248.750000 (survey feet)
Bottom554854.688000 (survey feet)
In Unprojected coordinates (geographic)
GCS North American 1983
BoundaryCoordinate
West-73.736713 (longitude)
East-71.781471 (longitude)
North42.052529 (latitude)
South40.979753 (latitude)
+ Data Structure and Attribute Information
Overview
Summary of the information content of the data, including other references to complete descriptions of entity types, attributes, and attribute values for the data.
Entity and attribute overview:
Includes linear and polygonal features for rivers, streams, brooks, reservoirs, lakes, ponds, bays, coves, harbors, marshes, dams, aqueducts, canals, drainage ditches, shorelines, tidal flats, submerged rocks, channels, and islands published on the U.S. Geological Survey 7.5 minute topographic quadrangle maps. Information encoded about features includes hydrography type classification, two standard symbology classification schemes, waterbody names, flags for named features, levels for mapping at different scales, feature area in acreage, and feature length in miles. Use the AV_LEGEND attribute to symbolize features by type. Use the IMS_LEGEND attribute to more generally symbolize the features by type. To define a layer that only includes named waterbodies, query line and polygon features for NAMEDP_COD and NAMEDA_COD values greater than 0. To define a layer that only includes named lakes, query the line and polygon features for LAKE_NO and LAKE_NO2 values greater than 0. To define a layer that only includes named streams, query the line and polygon features for STREAM_NO and STREAM_NO2 values greater than 0, and so on. To define a layer that only includes the Connecticut River, query line and polygon features for STREAM_NO and STREAM_NO2 equal to 374. The Stream number for the Connecticut River is 374. Each stream, lake, bay, and harbor can be queried by Id number. To define a layer that includes features typically displayed on a map, exclude all unnecessary features by querying the line and polygon features for AV_LEGEND not equal to "No Show" or IMS_LEGEND not equal to "No Show". Typically, line features with the "No Show" classification enclose Hydrography polygon features that are not outlined on a map. Examples of line features typically not shown on a map include closure lines separating adjacent open water polygons, boundaries defining bay and harbor extents, apparent limits of marsh polygons, apparent limits of rock polygons, apparent limits of tidal flat polygons, underground shorelines, and submerged streams. Define layers of hydrography for various map scale ranges by querying line and polygon features on SCALELEVEL values.
Entity and attribute detailed citation:
For additional information related to the original source of data from the U.S. Geological Survey, refer to the Data User Guides and Standards for 1:24,000-Scale Digital Line Graphs and Quadrangle Maps available from the U.S. Geological Survey, National Mapping Program.
Direct spatial reference method: Vector
Indirect spatial reference method: Connecticut Stream, Lake, and Bay names and numbers
Attributes of Connecticut Hydrography Line
Detailed descriptions of entity type, attributes, and attribute values for the data.
Name: depgis.DEP.HYDROGRAPHY_LINE
Type of object: Feature Class
Geometry type: Polyline
Number of records: 102082
Description:
Hydrography represented as line features. Line features represent single-line rivers and streams, aqueducts, canals, and ditches. Line features also enclose all polygon features in the form of natural shorelines, manmade shorelines, dams, closure lines separating adjacent waterbodies, and the apparent limits for tidal flats, rocks, and areas of marsh.
Source:
State of Connecticut, Department of Environmental Protection and U.S. Geological Survey, National Mapping Program
Attributes
OBJECTID
Definition:
Internal feature number.
Alias: OBJECTID Type: OID Width: 4 Precision: 10 Scale: 0
Attribute values: Sequential unique whole numbers that are automatically generated.
Attribute definition source:
ESRI
SHAPE
Definition:
Feature geometry.
Alias: SHAPE Type: Geometry Width: 4 Precision: 0 Scale: 0
Attribute values: Coordinates defining the features.
Attribute definition source:
ESRI
HYARC_COD
Definition:
Hydrography Arc Code. Numeric values that identify hydrography line feature types. These codes are based on the original 1:24,000-scale USGS DLG Hydrography Major and Minor codes, but have been modified by CT DEP to add to or combine USGS classifications.
Alias: HYARC_COD Type: Double Width: 8 Precision: 16 Scale: 5Output width: 10
Attribute domain values
ValueDefinition
0
Not Hydrography
Definition Source:
CT DEP
109
Sewage Disposal Pond border
Definition Source:
CT DEP, USGS
200
Shoreline for Stream, Lake and Open Water polys
Definition Source:
CT DEP, USGS
201
Manmade Shoreline
Definition Source:
CT DEP, USGS
202
Closure Line separating adjacent Open Water polys
Definition Source:
CT DEP, USGS
203
Indefinite Shoreline
Definition Source:
CT DEP, USGS
204
Apparent Limit of Flat and Sand polygon areas
Definition Source:
CT DEP, USGS
205
Defines extent of coastal bays and harbors
Definition Source:
CT DEP, USGS
206
Apparent Limit of Marsh polygon areas
Definition Source:
CT DEP, USGS
401
Falls
Definition Source:
CT DEP, USGS
406
Dam or Weir
Definition Source:
CT DEP, USGS
407
Canal, Lock, or Sluice Gate
Definition Source:
CT DEP, USGS
408
Spillway
Definition Source:
CT DEP, USGS
409
Gate (Flood, Tidal, Head, Check)
Definition Source:
CT DEP, USGS
410
Boundary of Rock in Open Water
Definition Source:
CT DEP, USGS
412
Single line Rivers, Streams and Brooks
Definition Source:
CT DEP, USGS
414
Ditch or Canal
Definition Source:
CT DEP, USGS
415
Aqueduct
Definition Source:
CT DEP, USGS
417
Penstock
Definition Source:
CT DEP, USGS
418
Siphon
Definition Source:
CT DEP, USGS
419
Boundary of Channel in Open Water
Definition Source:
CT DEP, USGS
601200
Underground Shoreline
Definition Source:
CT DEP, USGS
601412
Underground Stream
Definition Source:
CT DEP, USGS
601415
Underground Aqueduct
Definition Source:
CT DEP, USGS
610200
Intermittent Shoreline
Definition Source:
CT DEP, USGS
610412
Intermittent Stream
Definition Source:
CT DEP, USGS
610414
Intermittent Ditch or Canal
Definition Source:
CT DEP, USGS
611414
Abandoned or Discontinued Ditch
Definition Source:
CT DEP, USGS
611415
Abandoned Aqueduct
Definition Source:
CT DEP, USGS
612200
Submerged or Sunken Shoreline
Definition Source:
CT DEP, USGS
612412
Submerged or Sunken Stream
Definition Source:
CT DEP, USGS
Attribute definition source:
State of Connecticut, Department of Environmental Protection
HYDRO_ARC
Definition:
Hydrography Arc Type. Text values that correspond to the numeric HYARC_COD attribute values. HYDRO_ARC is the English language equivalent of (decodes) the HYARC_COD field.
Alias: HYDRO_ARC Type: String Width: 50 Precision: 0 Scale: 0Output width: 50
Attribute values: See Enumerated Domain Value Definitions for HYARC_COD attribute.
Attribute definition source:
State of Connecticut, Department of Environmental Protection
AV_LEGEND
Definition:
ArcView Legend. Text field for symbolizing hydrography line feature types on a map.
Alias: AV_LEGEND Type: String Width: 20 Precision: 0 Scale: 0Output width: 20
Attribute domain values
ValueDefinition
Aqueduct
This category includes HYARC_COD values 415, 601415, and 611415.
Definition Source:
CT DEP
Dam
This category includes HYARC_COD value 406.
Definition Source:
CT DEP
Drainage Ditch
This category includes HYARC_COD 414 and 611414.
Definition Source:
CT DEP
Dredged Channel
This category includes HYARC_COD 419.
Definition Source:
CT DEP
Intermittent Water
This category includes HYARC_COD 610412 and 610414.
Definition Source:
CT DEP
No Show
This category includes HYARC_COD value 0, 202, 204, 205, 206, 409, 410, 612200, and 612412.
Definition Source:
CT DEP
Shore
This category includes HYARC_COD value 200, 201, 203, 417, 601200, and 610200.
Definition Source:
CT DEP
Water
This category includes HYARC_COD value 109, 401, 407, 408, 412, 418, and 601412.
Definition Source:
CT DEP
Attribute definition source:
State of Connecticut, Department of Environmental Protection
IMS_LEGEND
Definition:
Internet Mapping Software Legend. Text field for classifying and symbolizing hydrography line feature types in a simple manner for an Internet map.
Alias: IMS_LEGEND Type: String Width: 20 Precision: 0 Scale: 0Output width: 20
Attribute domain values
ValueDefinition
Aqueduct
This category includes HYARC_COD values 415, 601415, and 611415.
Definition Source:
CT DEP
Dam
This category includes HYARC_COD value 406.
Definition Source:
CT DEP
Dredged Channel
This category includes HYARC_COD values 419.
Definition Source:
CT DEP
No Show
This category includes HYARC_COD values 0, 202, 204, 205, 206, 409, 410, 612200, and 612412.
Definition Source:
CT DEP
Water
This category includes HYARC_COD values 109, 200, 201, 203, 401, 407, 408, 412, 414, 417, 418, 601200, 601412, 610200, 610412, 610414, and 611414.
Definition Source:
CT DEP
Attribute definition source:
State of Connecticut, Department of Environmental Protection
COASTA_COD
Definition:
Coastal Arc Code. Identifies line features that are landward and seaward of a series of connecting hydrography line features that define a shoreline along the coast. These connecting hydrography line features that define the shoreline along the coast are referred to as Coastline Arcs and have a COASTA_COD value of 2. Coastline Arcs define a cartographic boundary that separates inland (landward) hydrography from coastal (seaward) hydrography features. This shoreline boundary does not represent a line of demarcation between tidal and non-tidal waters or between fresh, saline and brackish waters. Rather, these features define a standard shoreline boundary that is often incorporated into other layers compiled at 1:24,000 scale for consistency.
Alias: COASTA_COD Type: SmallInteger Width: 2 Precision: 5 Scale: 0Output width: 1
Attribute domain values
ValueDefinition
1
Inland Arcs. Line features that are inland (landward) of the line of Coastline Arcs, which have COASTA_COD values of 2.
Definition Source:
CT DEP
2
Coastline Arcs. Line features that define a coastline that separates inland from coastal hydrography features. This is a cartographic boundary that often defines the shoreline in other 1:24,000-scale datalayers published by the State of Connecticut, Department of Environmental Protection. Note, this boundary line does not represent a line of demarcation between tidal and non-tidal waters or between fresh, saline and brackish waters.
Definition Source:
CT DEP
3
Island Interior Arcs. Line features that separate smaller polygon features within Coastal Island polygons. For example, a line that separates a marsh area on an island from the area where there is not marsh on the island.
Definition Source:
CT DEP
4
Island Coastline Arcs. Line features that define the shorelines for Coastal Island Polygon features. Coastal Island Polygon features have a COASTP_COD value of 2.
Definition Source:
CT DEP
5
Open Water Arcs. Line features seaward of the line of Coastline Arcs that outline Coastal Water Polygon features. Coastal Water Polygon features are Hydrography polygon features with a COASTP_COD valule of 3. For example, types of Open Water Arcs include a line separating a tidal flat polygon from an open water polygon (apparent tidal flat limit), or a line between an open water polygon that represents a coastal bay from the larger open water polygon representing the larger area of Long Island Sound.
Definition Source:
CT DEP
Attribute definition source:
State of Connecticut, Department of Environmental Protection
COAST_ARC
Definition:
Coastal Arc Type. Text values that correspond to the numeric COASTA_COD attribute values. COAST_ARC is the English language equivalent of (decodes) the COASTA_COD field.
Alias: COAST_ARC Type: String Width: 30 Precision: 0 Scale: 0Output width: 30
Attribute domain values
ValueDefinition
Inland Arcs
Inland Arcs
Definition Source:
CT DEP
Coastline Arcs
Coastline Arcs
Definition Source:
CT DEP
Island Interior Arcs
Island Interior Arcs
Definition Source:
CT DEP
Island Coastline Arcs
Island Coastline Arcs
Definition Source:
CT DEP
Open Water Arcs
Open Water Arcs
Definition Source:
CT DEP
Attribute definition source:
State of Connecticut, Department of Environmental Protection
NAMEDA_COD
Definition:
Named Waterbody Arc Code - A numeric code used to flag and classify hydrography line features that are part of named and unnamed waterbodies. Named waterbodies are defined as features with STREAM_NO, STREAM_NO2, LAKE_NO, LAKE_NO2, BAY_NO, BAY_NO2, HARBOR_NO, HARBOR_NO2, SOUND_NO, or SOUND_NO2 values greater than 0.
Alias: NAMEDA_COD Type: SmallInteger Width: 2 Precision: 5 Scale: 0Output width: 1
Attribute domain values
ValueDefinition
1
Unnamed Feature. A Hydrography feature that is not part of a named or unnamed waterbody. Typically, these are apparent limits of marsh polygons.
Definition Source:
CT DEP
2
Named Single Line Stream. A named river, stream or brook represented as a single line feature.
Definition Source:
CT DEP
3
Named Waterbody Shoreline. The shoreline of a named waterbody polygon feature.
Definition Source:
CT DEP
4
Named Waterbody Interior Line. A hydrography line feature that is part of a named waterbody, but not typically displayed on a map such as a closure line separating open water polygons or an apparent limit of tidal flats or sand polygons.
Definition Source:
CT DEP
5
Significant Unnamed Waterbody. An unnamed hydrography feature that is significant because it connects to (is between) hydrography features that are named.
Definition Source:
CT DEP
7
Unnamed Single Line Stream.  An unnamed river, stream or brook represented as a single line feature.
Definition Source:
CT DEP
8
Unnamed Waterbody Shoreline. The shoreline of an unnamed waterbody polygon feature.
Definition Source:
CT DEP
Attribute definition source:
State of Connecticut, Department of Environmental Protection
NAMED_ARC
Definition:
Named Waterbody Arc Type. NAMED_ARC is the English language equivalent of (decodes) the NAMEDA_COD field.
Alias: NAMED_ARC Type: String Width: 40 Precision: 0 Scale: 0Output width: 40
Attribute values: See Enumerated Domain Value Definitions for NAMEDA_COD attribute.
Attribute definition source:
State of Connecticut, Department of Environmental Protection
SCALELEVEL
Definition:
Scale Level. A numeric code that defines scale range levels for features. Scale Level values range from 1 to 6. More features are included in the higher Scale Levels. For example, Scale Level 1 includes only a few major rivers and is intended for a small map of Connecticut. Conversely, Scale Level 6 includes all waterbodies and is intended for more detailed maps displayed at about 1:24,000 scale. Use the Scale Level attribute to specify a definition query that displays a particular set of features, for example SCALELEVEL = 1. Then set the appropriate range of scale (e.g. from 1,000,001 to 3,000,000 scale) for the layer, according to application (mapping) need. Note, Scale Levels are additive so include all Scale Levels below the desired level in a definition query. For example, use the following SQL expression to query for Scale Level 4 features - SCALELEVEL IN (1,2,3,4). Note the use of the IN (INCLUDE) operator in the SQL expression.
Alias: SCALELEVEL Type: SmallInteger Width: 2 Precision: 5 Scale: 0Output width: 1
Attribute domain values
ValueDefinition
1
Scale Level 1. Recommended scale range - 1:1,000,001 to 1:3,000,000. Includes 11 rivers.
Definition Source:
CT DEP
2
Scale Level 2. Recommended scale range - 1:500,001 to 1:1,000,000. Includes 19 rivers and 5 lakes.
Definition Source:
CT DEP
3
Scale Level 3. Recommended scale range - 1:200,001 to 1:500,000. Includes 109 rivers and 13 lakes.
Definition Source:
CT DEP
4
Scale Level 4. Recommended scale range - 1:100,001 to 1:200,000. Includes mainstem rivers for each Subregional Drainage Basin. Includes 301 rivers and 137 lakes.
Definition Source:
CT DEP
5
Scale Level 5. Recommended scale range - 1:50,001 to 1:100,000. Includes 1532 rivers and 1076 lakes greater than 5 acres in size.
Definition Source:
CT DEP
6
Scale Level 6. Recommended scale range - 1:1 to 50,000. Includes all rivers and lakes.
Definition Source:
CT DEP
Attribute definition source:
State of Connecticut, Department of Environmental Protection
STREAM_NO
Definition:
Stream Number - ID Number of named stream (for single-line stream) or named stream on left side of line feature.
Alias: STREAM_NO Type: Integer Width: 4 Precision: 10 Scale: 0Output width: 5
Attribute values: Numeric value
Attribute definition source:
State of Connecticut, Department of Environmental Protection
STREAM
Definition:
Stream Name - Name of stream (for single-line stream) or name of stream on left side of line feature. STREAM is the English language equivalent of (decodes) the STREAM_NO field.
Alias: STREAM Type: String Width: 40 Precision: 0 Scale: 0Output width: 40
Attribute values: Text value
Attribute definition source:
State of Connecticut, Department of Environmental Protection
STREAM_NO2
Definition:
Stream Number 2 - ID Number of named stream on right side of line feature.
Alias: STREAM_NO2 Type: Integer Width: 4 Precision: 10 Scale: 0Output width: 5
Attribute values: Numeric value
Attribute definition source:
State of Connecticut, Department of Environmental Protection
STREAM2
Definition:
Stream Name 2 - Name of stream on right side of line feature. STREAM2 is the English language equivalent of (decodes) the STREAM_NO2 field.
Alias: STREAM2 Type: String Width: 40 Precision: 0 Scale: 0Output width: 40
Attribute values: Text value
Attribute definition source:
State of Connecticut, Department of Environmental Protection
LAKE_NO
Definition:
Lake Number - ID Number of named lake on left side of line feature.
Alias: LAKE_NO Type: Integer Width: 4 Precision: 10 Scale: 0Output width: 5
Attribute values: Numeric value
Attribute definition source:
State of Connecticut, Department of Environmental Protection
LAKE
Definition:
Lake Name - Name of lake on left side of line feature. LAKE is the English language equivalent of (decodes) the LAKE_NO field.
Alias: LAKE Type: String Width: 40 Precision: 0 Scale: 0Output width: 40
Attribute values: Text value
Attribute definition source:
State of Connecticut, Department of Environmental Protection
LAKE_NO2
Definition:
Lake Number 2 - ID Number of named lake on right side of line feature.
Alias: LAKE_NO2 Type: Integer Width: 4 Precision: 10 Scale: 0Output width: 5
Attribute values: Numeric value
Attribute definition source:
State of Connecticut, Department of Environmental Protection
LAKE2
Definition:
Lake Name 2 - Name of lake on right side of line feature. LAKE2 is the English language equivalent of (decodes) the LAKE_NO2 field.
Alias: LAKE2 Type: String Width: 40 Precision: 0 Scale: 0Output width: 40
Attribute values: Text value
Attribute definition source:
State of Connecticut, Department of Environmental Protection
BAY_NO
Definition:
Bay Number - ID Number of named bay or cove on left side of line feature. Bays are subunits of Harbors.
Alias: BAY_NO Type: Integer Width: 4 Precision: 10 Scale: 0Output width: 5
Attribute values: Numeric value
Attribute definition source:
State of Connecticut, Department of Environmental Protection
BAY
Definition:
Bay Name - Name of bay or cove on left side of line feature. Bays are subunits of Harbors. BAY is the English language equivalent of (decodes) the BAY_NO field.
Alias: BAY Type: String Width: 40 Precision: 0 Scale: 0Output width: 40
Attribute values: Text value
Attribute definition source:
State of Connecticut, Department of Environmental Protection
BAY_NO2
Definition:
Bay Number 2 - ID Number of named bay or cove on right side of line feature. Bays are subunits of Harbors.
Alias: BAY_NO2 Type: Integer Width: 4 Precision: 10 Scale: 0Output width: 5
Attribute values: Numeric value
Attribute definition source:
State of Connecticut, Department of Environmental Protection
BAY2
Definition:
Bay Name 2 - Name of bay or cove on right side of line feature. Bays are subunits of Harbors. BAY2 is the English language equivalent of (decodes) the BAY_NO2 field.
Alias: BAY2 Type: String Width: 40 Precision: 0 Scale: 0Output width: 40
Attribute values: Text value
Attribute definition source:
State of Connecticut, Department of Environmental Protection
HARBOR_NO
Definition:
Harbor Number - ID Number of named harbor on left side of line feature. Harbors are comprised of Bays.
Alias: HARBOR_NO Type: Integer Width: 4 Precision: 10 Scale: 0Output width: 5
Attribute values: Numeric value
Attribute definition source:
State of Connecticut, Department of Environmental Protection
HARBOR
Definition:
Harbor Name - Name of harbor on left side of line feature. Harbors are comprised of Bays. HARBOR is the English language equivalent of (decodes) the HARBOR_NO field.
Alias: HARBOR Type: String Width: 40 Precision: 0 Scale: 0Output width: 40
Attribute values: Text value
Attribute definition source:
State of Connecticut, Department of Environmental Protection
HARBOR_NO2
Definition:
Harbor Number 2 - ID Number of named harbor on right side of line feature. Harbors are comprised of Bays.
Alias: HARBOR_NO2 Type: Integer Width: 4 Precision: 10 Scale: 0Output width: 5
Attribute values: Numeric value
Attribute definition source:
State of Connecticut, Department of Environmental Protection
HARBOR2
Definition:
Harbor Number 2 - Name of harbor on right side of line feature. Harbors are comprised of Bays. HARBOR2 is the English language equivalent of (decodes) the HARBOR_NO2 field.
Alias: HARBOR2 Type: String Width: 40 Precision: 0 Scale: 0Output width: 40
Attribute values: Text value
Attribute definition source:
State of Connecticut, Department of Environmental Protection
SOUND_NO
Definition:
Sound Number - ID Number of sound on left side of line feature.
Alias: SOUND_NO Type: Integer Width: 4 Precision: 10 Scale: 0Output width: 5
Attribute values: Numeric value
Attribute definition source:
State of Connecticut, Department of Environmental Protection
SOUND
Definition:
Sound - Name of sound on left side of line feature. SOUND is the English language equivalent of (decodes) the SOUND_NO field.
Alias: SOUND Type: String Width: 30 Precision: 0 Scale: 0Output width: 30
Attribute values: Text value
Attribute definition source:
State of Connecticut, Department of Environmental Protection
SOUND_NO2
Definition:
Sound Number 2 - ID Number of sound on right side of line feature.
Alias: SOUND_NO2 Type: Integer Width: 4 Precision: 10 Scale: 0Output width: 5
Attribute values: Numeric value
Attribute definition source:
State of Connecticut, Department of Environmental Protection
SOUND2
Definition:
Sound - Name of sound on right side of line feature. SOUND2 is the English language equivalent of (decodes) the SOUND_NO2 field.
Alias: SOUND2 Type: String Width: 30 Precision: 0 Scale: 0Output width: 30
Attribute values: Text value
Attribute definition source:
State of Connecticut, Department of Environmental Protection
LENGTH_MI
Definition:
Calculated length of feature in miles. Note, LENGTH_MI values are not automatically updated after modifying feature geometry (shape). Values must be recalculated after features are edited, simplified, generalized, clipped, dissolved, etc.
Alias: LENGTH_MI Type: Double Width: 8 Precision: 38 Scale: 8Output width: 8
Attribute values: Numeric value
Attribute definition source:
State of Connecticut, Department of Environmental Protection
SHAPE.len
Alias: SHAPE.len Type: Double Width: 0 Precision: 0 Scale: 0
ESRI Feature Description
Description of spatial objects in the data using the Environmental Systems Research Institute (ESRI) terminology.
Environmental Systems Research Institute (ESRI) terms
depgis.DEP.HYDROGRAPHY_LINE
ESRI feature type: Simple
Geometry type: Polyline
Topology: FALSE
Feature count: 102082
Spatial index: TRUE
Linear referencing: FALSE
SDTS Feature Description
Description of point and vector spatial objects in the data using the Spatial Data Transfer Standards (SDTS) terminology.
Spatial data transfer standard (SDTS) terms
depgis.DEP.HYDROGRAPHY_LINE
Type: String
Count: 102082
+ Data Quality and Accuracy Information
General
Information about the fidelity of relationships, data quality and accuracy tests, omissions, selection criteria, generalization, and definitions used to derive the data.
Logical consistency report:
Polygon features conform to the following topological rules. Polygons are single part. There are no duplicate polygons. Polygons do not self overlap. Polygons do not overlap other polygons. Polygons are bound by lines. Line features conform to the following topological rules. Lines are single part. There are no duplicate lines. Lines do not self overlap. Lines do not overlap other lines. Lines intersect only at nodes, and nodes anchor the ends of all lines. Lines do not overshoot or undershoot other lines they are supposed to meet and intersect. The tests of logical consistency were performed by the State of Connecticut using ESRI ArcInfo software to maintain feature topology in ArcInfo coverage format. The data is topologically clean. The ArcInfo Clean function was repeatedly used following edits to verify topology and enforce a minimum distance between vertices of 4 feet (fuzzy tolerance) and a minimum allowed overshoot length of 10 feet (dangle length).
Completeness report:
The completeness of the data reflects the USGS National Mapping Division standards for feature content of the data sources, which are the Large Scale (7.5 minute) Digital Line Graph (DLG) files available from the USGS. For Connecticut, the Large Scale DLG files used to create this layer are for the 1:24,000-scale topographic quadrangle maps published between 1969 and 1984.  The layer is complete in the sense that it accurately reflects the contents of the most recently published USGS topographic quadrangle maps available at the time the State of Connecticut, Department of Environmental Protection began creating the layer. More recent quadrangle maps have been published by the USGS since 1984; however, the State of Connecticut did not incorporate this information into the layer. So compared to the most recent set of topographic quadrangle maps available today, the layer is incomplete, and substantially incomplete when compared to waterbodies present today. This data is not updated.
Attribute Accuracy
Accuracy of the identification of data entities, features and assignment of attribute values.
Attribute accuracy report:
The layer retains the feature types identified by the USGS. All attributes have valid values. Values are within defined domains. The accuracy test for the HYARC_COD and HYPOLY_COD attribute values was conducted by comparing the waterbodies published on the source topographic quadrangle maps with 1:24,000-scale check plots or interactive displays of the Hydrography data on a computer graphic system. These checkplots and computer displays depicted the hydrography features in different colors based on their respective HYARC_COD and HYPOLY_COD values for comparison with the paper quadrangle maps. The HYDRO_ARC, HYDRO_POLY, AV_LEGEND, and IMS_LEGEND attribute values are based on HYARC_COD and HYPOLY_COD values. HYDRO_POLY is the English language equivalent of (decodes) the HYPOLY_COD field for polygon features. HYDRO_ARC is the English language equivalent of (decodes) the HYARC_COD field for line features. AV_LEGEND and IMS_LEGEND are broad classifications of HYPOLY_COD and HYARC_COD values for polygon and line features, respectively. Based on the HYPOLY_COD and HYARC_COD attribute values, the  HYDRO_POLY, HYDRO_ARC, AV_LEGEND, and IMS_LEGEND fields were populated through table joins to lookup tables. These decode values were not manually entered. Similarly, the COASTP_COD and COASTA_COD attribute values were manually entered, and the COAST_POLY and COAST_ARC attributes that decode these values were populated through table joins to lookup tables. The COAST_POLY field decodes the COASTP_COD field for polygon features. The COAST_ARC field decodes the COASTA_COD field line features. Polygon features were manually selected and populated with STREAM_NO, LAKE_NO, HARBOR_NO, BAY_NO, and SOUND_NO attributes values that identify individually named streams, lakes, harbors, bays and sounds. Named streams represented as a series of single-line features were manually selected and attributed with the corresponding stream number values. The STREAM_NO, STREAM_NO2, LAKE_NO, LAKE_NO2, HARBOR_NO, HARBOR_NO2, BAY_NO, BAY_NO2, SOUND_NO, and SOUND_NO2 for all other line features were attributed through an automated process based on STREAM_NO, LAKE_NO, HARBOR_NO, BAY_NO and SOUND_NO attribute values of the polygon features on the left and right side of line features. For example, shoreline features for all named streams and lakes were attributed with STREAM_NO and LAKE_NO values based on values that were carefully attributed for polygon features that define the waterbody areas. Additional fields that store waterbody names decode these waterbody number values and were populated though table joins to lookup tables.  For example, STREAM decodes STREAM_NO. STREAM2 decodes STREAM_NO2. LAKE decodes LAKE_NO. LAKE2 decodes LAKE_NO2. HARBOR decodes HARB0R_NO. HARBOR2 decodes HARBOR_NO2. BAY decodes BAY_NO. BAY2 decodes BAY_N02. SOUND decodes SOUND_NO. SOUND2 decodes SOUND_NO2.  The NAMEDP_COD and NAMEDA_COD attribute values are based on the values of STREAM_NO, LAKE_NO, BAY_NO, HARBOR_NO, SOUND_NO, and IMS_LEGEND. NAMED_POLY and NAMED_ARC attributes decode these values and were populated though table joins to lookup tables. The NAMED_POLY field decodes the NAMEDP_COD field for polygon features. The NAMED_ARC field decodes the NAMEDA_COD field for line features. The SCALELEVEL field encodes a cartographic preference defined by the State of Connecticut, Department of Environmental Protection for displaying 1:24,000-scale features at different map scales. There are 6 Scale Levels. Each Scale Level represents a chosen set of waterbodies based on STREAM_NO, LAKE_NO, BAY_NO, HARBOR_NO, and SOUND_NO values. The ACREAGE (area in acres) field was automatically calculated for each polygon feature based on computer generated feature area in square feet. The LENGTH_MI (length in miles) field was automatically calculated for each line feature base on computer generated feature length in feet.
Positional Accuracy
Accuracy of the positional aspects of the data.
Horizontal accuracy report:
This data complies with United States National Map Accuracy Standards for 1:24,000 scale maps. According to this standard, not more than 10 percent of the points tested are to be in error by more than 1/50 inch (40 feet) measured on the publication scale of a USGS 7.5 minute topographic quadrangle map.
+ Data Source and Process Information
Data Sources
Information about the source data used to construct or derive the data.
Data source information
Source 1 - DLG data for 112 of 115 quadrangle areas
Title: USGS Large Scale Digital Line Graph (DLG)
Originators: U.S. Geological Survey, National Mapping Program (data compiler and publisher)
Publisher: U.S Geological Survey
Publication date: 1969-1984
Data type: file
Map scale denominator: 24000
Media: digital tape media
Source contribution:
USGS Large Scale Digital Line Graph (DLG) data are digital representations of the cartographic (base map) information published on the 1:24,000-scale, 7.5 minute topographic quadrangle maps. The USGS produces DLG data per 7.5 minute quadrangle. DLG data is organized into categories such as hydrography, boundaries, and transportation. At the time the State of Connecticut began developing the Hydrography Master layer in the late 1980's, Large Scale DLG files were available for 112 of the 115 topographic quadrangle maps necessary to cover Connecticut. Large Scale DLG files were not available for the West Springfield Mass-Conn, Springfield South Mass-Conn, and Hamden Mass-Conn quadrangle. It is important to note that the Large-Scale DLGs were produced in the 1980's at a time when the USGS was developing standards, conventions, and procedures to convert topographic quadrangle maps into digital spatial data. The Connecticut DLG files were produced by digitizing from stable-base Mylars using a digitizing tablet to capture the digital data. The features were manually digitized and attributed. Today, there are other methods available for producing DLGs. For additional DLG documentation, refer to the Data User Guides and Standards for 1:24,000-Scale Digital Line Graphs and Quadrangle Maps available from the U.S. Geological Survey, National Mapping Program.
Beginning date: 1969
Ending date: 1984
Currentness reference:
Publication dates of the USGS 7.5 minute topographic quadrangle maps for the State of Connecticut through 1984.
Source 2 - Topo image data for 3 of 115 quadrangle areas
Title: Scanned USGS Topographic Quadrangle Map Mylars
Originators: U.S. Geological Survey, National Mapping Program (data compiler)
Publication date: Unpublished Material
Data type: raster digital data
Map scale denominator: 24000
Media: digital tape media
Source contribution:
In the absence of Large Scale DLG data, the USGS provided the State of Connecticut with raster image scans of the Mylar separates used to publish the black, red, brown, and blue inks for 3 of the 115 topographic quadrangle maps that cover Connecticut. These quadrangles include West Springfield Mass-Conn, Springfield South Mass-Conn, and Hamden Mass-Conn.
Date: 1979
Currentness reference:
publication date
Source 3 - Feature data for 115 quadrangle areas
Title: Hydrography 7.5 minute quadrangle Coverages
Originators: State of Connecticut, Department of Environmental Protection (data editor)
U.S. Geological Survey, National Mapping Program (data compiler)
Publication date: Unpublished Material
Data type: vector digital data
Map scale denominator: 24000
Media: disc
Source contribution:
Hydrography features for each quadrangle map. Each quadrangle hydrography layer is in ArcInfo Coverage format.
Beginning date: 1969
Ending date: 1984
Currentness reference:
Publication dates of the USGS 7.5 minute topographic quadrangle maps for the State of Connecticut through 1984.
Source 4 - Hydrography Master
Title: Connecticut Hydrography Master layer
Originators: State of Connecticut, Department of Environmental Protection (data editor and publisher)
U.S. Geological Survey, National Mapping Program (data compiler)
Publisher: State of Connecticut, Department of Environmental Protection
Publication place: Hartford, Connecticut, USA
Publication date: 19940101
Data type: vector digital data
Data location: http://www.ct.gov/deep
Map scale denominator: 24000
Media: disc
Source contribution:
Hydrography Master is a 1:24,000-scale, polygon and line feature-based layer that includes all hydrography features depicted on all of the U.S. Geological Survey (USGS) 7.5 minute topographic quadrangle maps that cover the State of Connecticut. This data source refers to all Hydrography features combined in one statewide layer. Since initial publication in 1994, subsequent editions of the Hydrography Master layer were generated by the State of Connecticut in order to change data format, convert from NAD 27 to NAD 83, and improve the quality and accuracy of both feature geometry and feature attribute information. Consequently, over a period of many years, different versions of the Hydrography Master layer were produced. Various editions of Hydrography are reflected by those process steps in which the Hydrography Master layer is identified as both the Source Used and the Source Produced. Hydrography Master is in ArcInfo Coverage format.
Beginning date: 1969
Ending date: 1984
Currentness reference:
Publication dates of the USGS 7.5 minute topographic quadrangle maps for the State of Connecticut through 1984.
Source 5 - Named Streams, Lakes and Ponds Mylar manuscripts
Title: Named Streams, Lakes and Ponds Mylar manuscripts
Originators: State of Connecticut, Department of Environmental Protection (data compiler)
Publisher: State of Connecticut, Department of Environmental Protection
Publication place: Hartford, Connecticut, USA
Publication date: Unpublished Material
Data type: map
Map scale denominator: 24000
Media: unstable-base material
Source contribution:
This data source is a set of Mylar overlays delineating all rivers, streams, brooks, reservoirs, lakes, and ponds that appear on the 1:24,000-scale 7.5 minute topographic quadrangle maps published by the USGS for Connecticut. The names of the waterbodies shown on these Mylars are based on either waterbody names that appear on the 1:24,000-scale 7.5 minute topographic quadrangle maps, names that appear on a state map of officially named waterbodies published by the State of Connecticut in the 1930's, or local names brought to the attention of the cartographer responsible for compiling the Named Streams, Lakes and Ponds Mylars. The Named Streams, Lakes and Ponds Mylars were originally compiled and mapped by James Bogar, a Cartographer with the State of Connecticut, Department of Environmental Protection.
Date: 1995
Currentness reference:
publication date
Source 6 - Connecticut
Title: Connecticut State layer
Originators: State of Connecticut, Department of Environmental Protection (data editor and publisher)
U.S. Geological Survey, National Mapping Program (data compiler)
Publisher: State of Connecticut, Department of Environmental Protection
Publication place: Hartford, Connecticut, USA
Publication date: 19940101
Edition: 2005
Data type: vector digital data
Data location: http://www.ct.gov/deep
Map scale denominator: 24000
Media: disc
Source contribution:
Connecticut is a 1:24,000-scale, polygon feature-based layer representing the geographic area encompassed by the State of Connecticut. The State of Connecticut is represented as a single polygon feature. The State boundary on the Connecticut mainland is based on 1:24,000-scale information depicted on the USGS 7.5 minute topographic maps. The State boundary in Long Island Sound is based on latitude and longitude coordinates. Connecticut is in ArcInfo Coverage format
Beginning date: 1969
Ending date: 1984
Currentness reference:
Publication dates of the USGS 7.5 minute topographic quadrangle maps for the State of Connecticut through 1984.
Source 7 - Hydrography
Title: Connecticut Hydrography layer
Originators: State of Connecticut, Department of Environmental Protection (data editor and publisher)
U.S. Geological Survey, National Mapping Program (data compiler)
Publisher: State of Connecticut, Department of Environmental Protection
Publication place: Hartford, Connecticut, USA
Publication date: 19940101
Edition: 2005
Data type: vector digital data
Data location: http://www.ct.gov/deep
Map scale denominator: 24000
Media: disc
Source contribution:
Hydrography is a 1:24,000-scale, polygon and line feature-based layer that includes all hydrography features depicted on the U.S. Geological Survey (USGS) 7.5 minute topographic quadrangle maps for the State of Connecticut. The geographic extent of the data is limited (clipped) to within the State of Connecticut boundary.
Beginning date: 1969
Ending date: 1984
Currentness reference:
Publication dates of the USGS 7.5 minute topographic quadrangle maps for the State of Connecticut through 1984.
Source 8 - Hydrography_Line.shp
Title: Connecticut Hydrography Line
Originators: State of Connecticut, Department of Environmental Protection (data editor and publisher)
U.S. Geological Survey, National Mapping Program (data compiler)
Publisher: State of Connecticut, Department of Environmental Protection
Publication place: Hartford, Connecticut, USA
Publication date: 19940101
Edition: 2005
Data type: vector digital data
Data location: http://www.ct.gov/deep
Map scale denominator: 24000
Media: disc
Source contribution:
Includes all line features from Hydrography where the AV_LEGEND attribute was not equal to a value of "No Show" (AV_LEGEND <> "No Show"). This selection criterion primarily includes streams, shore and dam features; and excludes closure lines separating adjacent open water polygon features and at the limit of the data layer, apparent limits of marsh polygon areas, apparent limits of flats and sand polygon areas, and extents of coastal bays and harbors. Hydrography_Line.shp is in Shapefile format.
Beginning date: 1969
Ending date: 1984
Currentness reference:
Publication dates of the USGS 7.5 minute topographic quadrangle maps for the State of Connecticut through 1984.
Source 9 - Hydrography_Line
Title: Connecticut Hydrography Line
Originators: State of Connecticut, Department of Environmental Protection (data editor and publisher)
U.S. Geological Survey, National Mapping Program (data compiler)
Publisher: State of Connecticut, Department of Environmental Protection
Publication place: Hartford, Connecticut, USA
Publication date: 19940101
Edition: 2005
Data type: vector digital data
Data location: http://www.ct.gov/deep
Map scale denominator: 24000
Media: disc
Source contribution:
Hydrography_Line is in GeoDatabase Feature Class format.
Beginning date: 1969
Ending date: 1984
Currentness reference:
Publication dates of the USGS 7.5 minute topographic quadrangle maps for the State of Connecticut through 1984.
Process Steps
Information about events, parameters, tolerances and techniques applied to construct or derive the data.
Process step information
Process Step 1
Process description:
DLG to ArcInfo coverage format conversion - Using ESRI ArcInfo software, the State of Connecticut, Department of Enviromental Protection converted the Hydrography category for each Large Scale DLG file to ArcInfo Coverage format, resulting in one ArcInfo Coverage of polygon and line features for 112 of the 115 quadrangle areas that cover Connecticut. Each Coverage was converted from UTM to Connecticut State Plane, North American Datum of 1927 (NAD27).
Organization: State of Connecticut, Department of Environmental Protection
Person: Deborah Dumin, Jonathan Scull
Phone: 860-424-3540
Address type: mailing and physical address
Address:
79 Elm Street
City: Hartford
State or Province: Connecticut
Postal code: 06106
Country: USA
Process date: 1985-1987
Process software and version: ArcInfo 5
Data Source used
Source 1 - DLG data for 112 of 115 quadrangle areas
Title: USGS Large Scale Digital Line Graph (DLG)
Originators: U.S. Geological Survey, National Mapping Program (data compiler and publisher)
Publisher: U.S Geological Survey
Publication date: 1969-1984
Data type: file
Map scale denominator: 24000
Media: digital tape media
Source contribution:
USGS Large Scale Digital Line Graph (DLG) data are digital representations of the cartographic (base map) information published on the 1:24,000-scale, 7.5 minute topographic quadrangle maps. The USGS produces DLG data per 7.5 minute quadrangle. DLG data is organized into categories such as hydrography, boundaries, and transportation. At the time the State of Connecticut began developing the Hydrography Master layer in the late 1980's, Large Scale DLG files were available for 112 of the 115 topographic quadrangle maps necessary to cover Connecticut. Large Scale DLG files were not available for the West Springfield Mass-Conn, Springfield South Mass-Conn, and Hamden Mass-Conn quadrangle. It is important to note that the Large-Scale DLGs were produced in the 1980's at a time when the USGS was developing standards, conventions, and procedures to convert topographic quadrangle maps into digital spatial data. The Connecticut DLG files were produced by digitizing from stable-base Mylars using a digitizing tablet to capture the digital data. The features were manually digitized and attributed. Today, there are other methods available for producing DLGs. For additional DLG documentation, refer to the Data User Guides and Standards for 1:24,000-Scale Digital Line Graphs and Quadrangle Maps available from the U.S. Geological Survey, National Mapping Program.
Beginning date: 1969
Ending date: 1984
Currentness reference:
Publication dates of the USGS 7.5 minute topographic quadrangle maps for the State of Connecticut through 1984.
Data Source produced
Source 3 - Feature data for 115 quadrangle areas
Title: Hydrography 7.5 minute quadrangle Coverages
Originators: State of Connecticut, Department of Environmental Protection (data editor)
U.S. Geological Survey, National Mapping Program (data compiler)
Publication date: Unpublished Material
Data type: vector digital data
Map scale denominator: 24000
Media: disc
Source contribution:
Hydrography features for each quadrangle map. Each quadrangle hydrography layer is in ArcInfo Coverage format.
Beginning date: 1969
Ending date: 1984
Currentness reference:
Publication dates of the USGS 7.5 minute topographic quadrangle maps for the State of Connecticut through 1984.
Process Step 2
Process description:
Image to vector (ArcInfo coverage) format conversion - Using ESRI ArcInfo software, the blue ink image files that depict the waterbody and marsh features on 3 of 115 topographic quadrangle maps were georeferenced to Connecticut State Plane, North American Datum of 1927 (NAD27) by registering the image corners to the corresponding quadrangle corner tics.  In an interactive ArcInfo editing environment, the geogreferenced image of hydrography was displayed in the background in order to visually identify waterbody and marsh features to vectorize (digitize). Features that would have been included in the DLG Hydrorgraphy category by the USGS were were manually digitized on the screen (heads-up digitizing) at display scales greater than 1:24,000. Hydrography polygon and line features were assigned HYPOLY_COD and HYARC_COD values based on their cartographic representation on the topographic quadrangle maps. Check plots were produced to inspect digitizing quality and the assignment of HYPOLY_COD and HYARC_COD values.
Organization: State of Connecticut, Department of Environmental Protection
Person: Howie Sternberg
Phone: 860-424-3540
Address type: mailing and physical address
Address:
79 Elm Street
City: Hartford
State or Province: Connecticut
Postal code: 06106
Country: USA
Process date: 1988
Process software and version: ArcInfo 5
Data Source used
Source 2 - Topo image data for 3 of 115 quadrangle areas
Title: Scanned USGS Topographic Quadrangle Map Mylars
Originators: U.S. Geological Survey, National Mapping Program (data compiler)
Publication date: Unpublished Material
Data type: raster digital data
Map scale denominator: 24000
Media: digital tape media
Source contribution:
In the absence of Large Scale DLG data, the USGS provided the State of Connecticut with raster image scans of the Mylar separates used to publish the black, red, brown, and blue inks for 3 of the 115 topographic quadrangle maps that cover Connecticut. These quadrangles include West Springfield Mass-Conn, Springfield South Mass-Conn, and Hamden Mass-Conn.
Date: 1979
Currentness reference:
publication date
Data Source produced
Source 3 - Feature data for 115 quadrangle areas
Title: Hydrography 7.5 minute quadrangle Coverages
Originators: State of Connecticut, Department of Environmental Protection (data editor)
U.S. Geological Survey, National Mapping Program (data compiler)
Publication date: Unpublished Material
Data type: vector digital data
Map scale denominator: 24000
Media: disc
Source contribution:
Hydrography features for each quadrangle map. Each quadrangle hydrography layer is in ArcInfo Coverage format.
Beginning date: 1969
Ending date: 1984
Currentness reference:
Publication dates of the USGS 7.5 minute topographic quadrangle maps for the State of Connecticut through 1984.
Process Step 3
Process description:
Attribute value verification - The quality and accuracy of the digitizing and coding for all hydrography features was checked by comparing the features in each ArcInfo Coverage with the water features on the published USGS topographic quadrangle maps. Visual comparisons using 1:24,000-scale paper check plots combined with automated procedures to identify inconsistent attribute coding were the primary means of evaluating and correcting obvious errors with the original DLG data. Where necessary, corrections were made to DLG major and minor codes in the ArcInfo Coverages. The original DLG major and minor codes were modified to form the HYPOLY_COD and HYARC_COD attribute in the final Hydrography Master layer.
Organization: State of Connecticut, Department of Environmental Protection
Person: Diana Danenberg
Phone: 860-424-3540
Address type: mailing and physical address
Address:
79 Elm Street
City: Hartford
State or Province: Connecticut
Postal code: 06106
Country: USA
Process date: 1985-1988
Process software and version: ArcInfo 5, 6
Data Source used
Source 3 - Feature data for 115 quadrangle areas
Title: Hydrography 7.5 minute quadrangle Coverages
Originators: State of Connecticut, Department of Environmental Protection (data editor)
U.S. Geological Survey, National Mapping Program (data compiler)
Publication date: Unpublished Material
Data type: vector digital data
Map scale denominator: 24000
Media: disc
Source contribution:
Hydrography features for each quadrangle map. Each quadrangle hydrography layer is in ArcInfo Coverage format.
Beginning date: 1969
Ending date: 1984
Currentness reference:
Publication dates of the USGS 7.5 minute topographic quadrangle maps for the State of Connecticut through 1984.
Data Source produced
Source 3 - Feature data for 115 quadrangle areas
Title: Hydrography 7.5 minute quadrangle Coverages
Originators: State of Connecticut, Department of Environmental Protection (data editor)
U.S. Geological Survey, National Mapping Program (data compiler)
Publication date: Unpublished Material
Data type: vector digital data
Map scale denominator: 24000
Media: disc
Source contribution:
Hydrography features for each quadrangle map. Each quadrangle hydrography layer is in ArcInfo Coverage format.
Beginning date: 1969
Ending date: 1984
Currentness reference:
Publication dates of the USGS 7.5 minute topographic quadrangle maps for the State of Connecticut through 1984.
Process Step 4
Process description:
Quadrangle coverage edgematch - Using ESRI ArcInfo software, the individual 7.5 minute quadrangle coverages of Hydrography features were systematically edgematched. Line features that cross adjacent quadrangles were moved to make their end-point coordinates identical along quadrangle boundaries through a process of checkerboard style edgematching. Features along the edges of every other quadrangle were adjusted. The ends of rivers and shoreline segments were snapped to align with the connecting stationary features on adjacent quadrangles if their end-points were generally within 20 feet. Ends of line features were adjusted to match the location of the ends of the corresponding feature on adjacent quadrangles so that features would connect when the quadrangle coverages were appended in the subsequent process step. On occasion, there were no connecting features on adjacent quadrangles to match to so a few features abruptly end at quadrangle boundaries. These breaks are mostly due to variations in quadrangle publication dates.  Varying publication dates also explain inconsistent DLG major and minor codes for some features that appear on more than one topographic map. For example, a stream that appears on two adjacent quadrangle maps may appear as an intermittent stream on one map and a perennial stream on the adjacent (more recently published) map. Consequently, HYARC_COD values for some hydrography line features change when crossing quadrangle boundaries or the HYPOLY_COD value might represent a marsh for the portion of a lake published on an adjacent quadrangle map. These inconsistencies were not resolved because the purpose was to edgematch features and preserve the feature classification of USGS topographic quadrangle maps. Data was not field checked and not updated based on aerial photography. Also, line features digitized to enclose marsh areas were not edgematched along quadrangle boundaries because these boundary lines do not actually appear on the USGS topographic quadrangle maps. These are approximate (assumed) boundaries for the general areas where marsh symbols appear on the USGS topographic quadrangle maps.
Organization: State of Connecticut, Department of Environmental Protection
Person: Diana Danenberg
Phone: 860-424-3540
Address type: mailing and physical address
Address:
79 Elm Street
City: Hartford
State or Province: Connecticut
Postal code: 06106
Country: USA
Process date: 1989-1990
Process software and version: ArcInfo 5
Data Source used
Source 3 - Feature data for 115 quadrangle areas
Title: Hydrography 7.5 minute quadrangle Coverages
Originators: State of Connecticut, Department of Environmental Protection (data editor)
U.S. Geological Survey, National Mapping Program (data compiler)
Publication date: Unpublished Material
Data type: vector digital data
Map scale denominator: 24000
Media: disc
Source contribution:
Hydrography features for each quadrangle map. Each quadrangle hydrography layer is in ArcInfo Coverage format.
Beginning date: 1969
Ending date: 1984
Currentness reference:
Publication dates of the USGS 7.5 minute topographic quadrangle maps for the State of Connecticut through 1984.
Data Source produced
Source 3 - Feature data for 115 quadrangle areas
Title: Hydrography 7.5 minute quadrangle Coverages
Originators: State of Connecticut, Department of Environmental Protection (data editor)
U.S. Geological Survey, National Mapping Program (data compiler)
Publication date: Unpublished Material
Data type: vector digital data
Map scale denominator: 24000
Media: disc
Source contribution:
Hydrography features for each quadrangle map. Each quadrangle hydrography layer is in ArcInfo Coverage format.
Beginning date: 1969
Ending date: 1984
Currentness reference:
Publication dates of the USGS 7.5 minute topographic quadrangle maps for the State of Connecticut through 1984.
Process Step 5
Process description:
Statewide layer creation - Using ESRI ArcInfo sofware, all (115)  7.5 minute quadrangle coverages were appended to form a single, statewide Hydrography Master layer.  Linear features were unsplit (merged) to eliminate unnecessary pseudo nodes between similar features from adjacent quadrangle areas. Polygon features were merged across quadrangle boundaries. Final polygon and line feature topology was established with ArcInfo Fuzzy and Dangle tolerances verified at 4 and 10 feet, respectively. At this step in the process the Hydrography Master layer was fully attributed and ready for use. Not all data fields from the orginal DLG files were preserved by this step in the process. A new data field, AV_LEGEND, was added to more easily classify and cartographically represent features when mapping and displaying the information with software such as ArcView.
Organization: State of Connecticut, Department of Environmental Protection
Person: Howie Sternberg
Phone: 860-424-3540
Address type: mailing and physical address
Address:
79 Elm Street
City: Hartford
State or Province: Connecticut
Postal code: 06106
Country: USA
Process date: 1994
Process software and version: ArcInfo 6
Data Source used
Source 3 - Feature data for 115 quadrangle areas
Title: Hydrography 7.5 minute quadrangle Coverages
Originators: State of Connecticut, Department of Environmental Protection (data editor)
U.S. Geological Survey, National Mapping Program (data compiler)
Publication date: Unpublished Material
Data type: vector digital data
Map scale denominator: 24000
Media: disc
Source contribution:
Hydrography features for each quadrangle map. Each quadrangle hydrography layer is in ArcInfo Coverage format.
Beginning date: 1969
Ending date: 1984
Currentness reference:
Publication dates of the USGS 7.5 minute topographic quadrangle maps for the State of Connecticut through 1984.
Data Source produced
Source 4 - Hydrography Master
Title: Connecticut Hydrography Master layer
Originators: State of Connecticut, Department of Environmental Protection (data editor and publisher)
U.S. Geological Survey, National Mapping Program (data compiler)
Publisher: State of Connecticut, Department of Environmental Protection
Publication place: Hartford, Connecticut, USA
Publication date: 19940101
Data type: vector digital data
Data location: http://www.ct.gov/deep
Map scale denominator: 24000
Media: disc
Source contribution:
Hydrography Master is a 1:24,000-scale, polygon and line feature-based layer that includes all hydrography features depicted on all of the U.S. Geological Survey (USGS) 7.5 minute topographic quadrangle maps that cover the State of Connecticut. This data source refers to all Hydrography features combined in one statewide layer. Since initial publication in 1994, subsequent editions of the Hydrography Master layer were generated by the State of Connecticut in order to change data format, convert from NAD 27 to NAD 83, and improve the quality and accuracy of both feature geometry and feature attribute information. Consequently, over a period of many years, different versions of the Hydrography Master layer were produced. Various editions of Hydrography are reflected by those process steps in which the Hydrography Master layer is identified as both the Source Used and the Source Produced. Hydrography Master is in ArcInfo Coverage format.
Beginning date: 1969
Ending date: 1984
Currentness reference:
Publication dates of the USGS 7.5 minute topographic quadrangle maps for the State of Connecticut through 1984.
Process Step 6
Process description:
Named waterbody attribution - Lookup data tables listing named streams, named lakes, named bays, named harbors, and named sounds were manually created based on information from the Streams, Lakes and Ponds Mylars prepared by the State of Connecticut, Department of Environmental Protection. In each lookup table, unique id numbers were assigned to each waterbody based on an alphabetic sort of records by name. For example, STREAM_NO values were calculated for named streams, LAKE_NO for named lakes, BAY_NO and HARBOR_NO for named bays and harbors, and SOUND_NO for sounds such as Long Island Sound. These unique stream, lake, bay and harbor numbers were then manually transferred to the paper copies of the Streams, Lakes and Ponds Mylar overlays. On the maps, stream numbers were placed next to named streams, lake numbers were placed next to named lakes, etc. This hard copy information was prepared as a visual a guide for subsequently attributing Hydrography line and polygon features. To prepare the Hydrography Master layer for attribution, the STREAM_NO, LAKE_NO, BAY_NO, HARBOR_NO, and SOUND_NO fields were added to the Hydrography polygon feature table. The STREAM_NO, STREAM_NO2, LAKE_NO, LAKE_NO2, BAY_NO, BAY_NO2, HARBOR_NO, HARBOR_NO2, SOUND_NO, and SOUND_NOS fields were added to the Hydrography line feature table. Note, Hydrography line features require a pair of fields for each water body type (e.g. STREAM_NO and STREAM_NO2) because the line may bound more than one Hydrography polygon feature that is named. For example, at the confluence of two named streams, the line that separates the two named stream polygons is a closure line that is attributed with the stream number for the stream on the left and the stream on the right side of the line. During an interactive editing session, polygon and line features were systematically selected and attributed with the appropriate STREAM_NO, LAKE_NO, BAY_NO, HARBOR_NO, and SOUND_NO values by referencing information prepared on the paper copies of the Streams, Lakes and Ponds Mylars. Data entry errors were identified and corrected by comparing the paper copies of the Streams, Lakes and Ponds Mylars with a series of hard copy check plots of Hydrography features labeled with stream, lake, bay, harbor, and sound numbers. Once Hydrography features were properly attributed, decode fields that store the names of the streams, lakes, bays, harbors, and sounds were added to the Hydrography polygon and line feature attribute tables by joining to the original lookup data tables. These joined fields that store waterbody names include STREAM, STREAM2, LAKE, LAKE2, BAY, BAY2, HARBOR, HARBOR2, SOUND and SOUND2. The COASTP_COD and COASTPA_COD attributes were subsequently attributed by first selecting and attributing Coastline Arcs, which define a cartographic boundary separating landward from seaward hydrography features. To form a continuous boundary line along the coast, it was necessary to introduce features that cross rivers at the first bridge upstream from Long Island Sound. These linear bridge features were copied from the Roads and Trails layer, published by the State of Connecticut, Department of Environmental Protection. All other polygon and line features were manually selected and assigned COASTP_COD and COASTA_COD values based on their relative landward and seaward orientation to Coastline Arcs. Also, new HYPOLY_COD attribute values were established to describe polygon features that represented islands and marshes that encompass entire islands (HYPOLY_COD values 121 and 111121).
Organization: State of Connecticut, Department of Environmental Protection
Person: James Bogar, Diana Danenberg, Howie Sternberg
Phone: 860-424-3540
Address type: mailing and physical address
Address:
79 Elm Street
City: Hartford
State or Province: Connecticut
Postal code: 06106
Country: USA
Process date: 1995
Process software and version: ArcInfo 7
Data Source used
Source 4 - Hydrography Master
Title: Connecticut Hydrography Master layer
Originators: State of Connecticut, Department of Environmental Protection (data editor and publisher)
U.S. Geological Survey, National Mapping Program (data compiler)
Publisher: State of Connecticut, Department of Environmental Protection
Publication place: Hartford, Connecticut, USA
Publication date: 19940101
Data type: vector digital data
Data location: http://www.ct.gov/deep
Map scale denominator: 24000
Media: disc
Source contribution:
Hydrography Master is a 1:24,000-scale, polygon and line feature-based layer that includes all hydrography features depicted on all of the U.S. Geological Survey (USGS) 7.5 minute topographic quadrangle maps that cover the State of Connecticut. This data source refers to all Hydrography features combined in one statewide layer. Since initial publication in 1994, subsequent editions of the Hydrography Master layer were generated by the State of Connecticut in order to change data format, convert from NAD 27 to NAD 83, and improve the quality and accuracy of both feature geometry and feature attribute information. Consequently, over a period of many years, different versions of the Hydrography Master layer were produced. Various editions of Hydrography are reflected by those process steps in which the Hydrography Master layer is identified as both the Source Used and the Source Produced. Hydrography Master is in ArcInfo Coverage format.
Beginning date: 1969
Ending date: 1984
Currentness reference:
Publication dates of the USGS 7.5 minute topographic quadrangle maps for the State of Connecticut through 1984.
Source 5 - Named Streams, Lakes and Ponds Mylar manuscripts
Title: Named Streams, Lakes and Ponds Mylar manuscripts
Originators: State of Connecticut, Department of Environmental Protection (data compiler)
Publisher: State of Connecticut, Department of Environmental Protection
Publication place: Hartford, Connecticut, USA
Publication date: Unpublished Material
Data type: map
Map scale denominator: 24000
Media: unstable-base material
Source contribution:
This data source is a set of Mylar overlays delineating all rivers, streams, brooks, reservoirs, lakes, and ponds that appear on the 1:24,000-scale 7.5 minute topographic quadrangle maps published by the USGS for Connecticut. The names of the waterbodies shown on these Mylars are based on either waterbody names that appear on the 1:24,000-scale 7.5 minute topographic quadrangle maps, names that appear on a state map of officially named waterbodies published by the State of Connecticut in the 1930's, or local names brought to the attention of the cartographer responsible for compiling the Named Streams, Lakes and Ponds Mylars. The Named Streams, Lakes and Ponds Mylars were originally compiled and mapped by James Bogar, a Cartographer with the State of Connecticut, Department of Environmental Protection.
Date: 1995
Currentness reference:
publication date
Data Source produced
Source 4 - Hydrography Master
Title: Connecticut Hydrography Master layer
Originators: State of Connecticut, Department of Environmental Protection (data editor and publisher)
U.S. Geological Survey, National Mapping Program (data compiler)
Publisher: State of Connecticut, Department of Environmental Protection
Publication place: Hartford, Connecticut, USA
Publication date: 19940101
Data type: vector digital data
Data location: http://www.ct.gov/deep
Map scale denominator: 24000
Media: disc
Source contribution:
Hydrography Master is a 1:24,000-scale, polygon and line feature-based layer that includes all hydrography features depicted on all of the U.S. Geological Survey (USGS) 7.5 minute topographic quadrangle maps that cover the State of Connecticut. This data source refers to all Hydrography features combined in one statewide layer. Since initial publication in 1994, subsequent editions of the Hydrography Master layer were generated by the State of Connecticut in order to change data format, convert from NAD 27 to NAD 83, and improve the quality and accuracy of both feature geometry and feature attribute information. Consequently, over a period of many years, different versions of the Hydrography Master layer were produced. Various editions of Hydrography are reflected by those process steps in which the Hydrography Master layer is identified as both the Source Used and the Source Produced. Hydrography Master is in ArcInfo Coverage format.
Beginning date: 1969
Ending date: 1984
Currentness reference:
Publication dates of the USGS 7.5 minute topographic quadrangle maps for the State of Connecticut through 1984.
Process Step 7
Process description:
Datum conversion - Using ESRI ArcInfo software, the Hydrography Master layer was converted from the Connecticut State Plane Coordinate System of 1927 (NAD27) to the Connecticut State Plane Coordinate System of 1983 (NAD83). The NADCON (North American Datum CONversion) data transformation was used.
Organization: State of Connecticut, Department of Environmental Protection
Person: Howie Sternberg
Phone: 860-424-3540
Address type: mailing and physical address
Address:
79 Elm Street
City: Hartford
State or Province: Connecticut
Postal code: 06106
Country: USA
Process date: 1999
Process software and version: ArcInfo 7
Data Source used
Source 4 - Hydrography Master
Title: Connecticut Hydrography Master layer
Originators: State of Connecticut, Department of Environmental Protection (data editor and publisher)
U.S. Geological Survey, National Mapping Program (data compiler)
Publisher: State of Connecticut, Department of Environmental Protection
Publication place: Hartford, Connecticut, USA
Publication date: 19940101
Data type: vector digital data
Data location: http://www.ct.gov/deep
Map scale denominator: 24000
Media: disc
Source contribution:
Hydrography Master is a 1:24,000-scale, polygon and line feature-based layer that includes all hydrography features depicted on all of the U.S. Geological Survey (USGS) 7.5 minute topographic quadrangle maps that cover the State of Connecticut. This data source refers to all Hydrography features combined in one statewide layer. Since initial publication in 1994, subsequent editions of the Hydrography Master layer were generated by the State of Connecticut in order to change data format, convert from NAD 27 to NAD 83, and improve the quality and accuracy of both feature geometry and feature attribute information. Consequently, over a period of many years, different versions of the Hydrography Master layer were produced. Various editions of Hydrography are reflected by those process steps in which the Hydrography Master layer is identified as both the Source Used and the Source Produced. Hydrography Master is in ArcInfo Coverage format.
Beginning date: 1969
Ending date: 1984
Currentness reference:
Publication dates of the USGS 7.5 minute topographic quadrangle maps for the State of Connecticut through 1984.
Data Source produced
Source 4 - Hydrography Master
Title: Connecticut Hydrography Master layer
Originators: State of Connecticut, Department of Environmental Protection (data editor and publisher)
U.S. Geological Survey, National Mapping Program (data compiler)
Publisher: State of Connecticut, Department of Environmental Protection
Publication place: Hartford, Connecticut, USA
Publication date: 19940101
Data type: vector digital data
Data location: http://www.ct.gov/deep
Map scale denominator: 24000
Media: disc
Source contribution:
Hydrography Master is a 1:24,000-scale, polygon and line feature-based layer that includes all hydrography features depicted on all of the U.S. Geological Survey (USGS) 7.5 minute topographic quadrangle maps that cover the State of Connecticut. This data source refers to all Hydrography features combined in one statewide layer. Since initial publication in 1994, subsequent editions of the Hydrography Master layer were generated by the State of Connecticut in order to change data format, convert from NAD 27 to NAD 83, and improve the quality and accuracy of both feature geometry and feature attribute information. Consequently, over a period of many years, different versions of the Hydrography Master layer were produced. Various editions of Hydrography are reflected by those process steps in which the Hydrography Master layer is identified as both the Source Used and the Source Produced. Hydrography Master is in ArcInfo Coverage format.
Beginning date: 1969
Ending date: 1984
Currentness reference:
Publication dates of the USGS 7.5 minute topographic quadrangle maps for the State of Connecticut through 1984.
Process Step 8
Process description:
Attribute enhancements - AV_LEGEND, HYDRO_POLY, HYDRO_ARC, COASTP_COD, COASTA_COD, STREAM, LAKE, HARBOR, BAY, and SOUND attributes were changed from storing abbreviated values in upper case (e.g. INTERMITTENT STREAM) to full length values in both upper and lower case (e.g. Intermittent Stream). Additionally, the IMS_LEGEND attribute was added to establish a very general classification scheme for symbolizing hydrography features with Internet mapping software environments such as ArcIMS.
Organization: State of Connecticut, Department of Environmental Protection
Person: Diana Danenberg, Elizabeth Doran
Phone: 860-424-3540
Address type: mailing and physical address
Address:
79 Elm Street
City: Hartford
State or Province: Connecticut
Postal code: 06106
Country: USA
Process date: 2001-2003
Process software and version: ArcInfo 7
Data Source used
Source 4 - Hydrography Master
Title: Connecticut Hydrography Master layer
Originators: State of Connecticut, Department of Environmental Protection (data editor and publisher)
U.S. Geological Survey, National Mapping Program (data compiler)
Publisher: State of Connecticut, Department of Environmental Protection
Publication place: Hartford, Connecticut, USA
Publication date: 19940101
Data type: vector digital data
Data location: http://www.ct.gov/deep
Map scale denominator: 24000
Media: disc
Source contribution:
Hydrography Master is a 1:24,000-scale, polygon and line feature-based layer that includes all hydrography features depicted on all of the U.S. Geological Survey (USGS) 7.5 minute topographic quadrangle maps that cover the State of Connecticut. This data source refers to all Hydrography features combined in one statewide layer. Since initial publication in 1994, subsequent editions of the Hydrography Master layer were generated by the State of Connecticut in order to change data format, convert from NAD 27 to NAD 83, and improve the quality and accuracy of both feature geometry and feature attribute information. Consequently, over a period of many years, different versions of the Hydrography Master layer were produced. Various editions of Hydrography are reflected by those process steps in which the Hydrography Master layer is identified as both the Source Used and the Source Produced. Hydrography Master is in ArcInfo Coverage format.
Beginning date: 1969
Ending date: 1984
Currentness reference:
Publication dates of the USGS 7.5 minute topographic quadrangle maps for the State of Connecticut through 1984.
Data Source produced
Source 4 - Hydrography Master
Title: Connecticut Hydrography Master layer
Originators: State of Connecticut, Department of Environmental Protection (data editor and publisher)
U.S. Geological Survey, National Mapping Program (data compiler)
Publisher: State of Connecticut, Department of Environmental Protection
Publication place: Hartford, Connecticut, USA
Publication date: 19940101
Data type: vector digital data
Data location: http://www.ct.gov/deep
Map scale denominator: 24000
Media: disc
Source contribution:
Hydrography Master is a 1:24,000-scale, polygon and line feature-based layer that includes all hydrography features depicted on all of the U.S. Geological Survey (USGS) 7.5 minute topographic quadrangle maps that cover the State of Connecticut. This data source refers to all Hydrography features combined in one statewide layer. Since initial publication in 1994, subsequent editions of the Hydrography Master layer were generated by the State of Connecticut in order to change data format, convert from NAD 27 to NAD 83, and improve the quality and accuracy of both feature geometry and feature attribute information. Consequently, over a period of many years, different versions of the Hydrography Master layer were produced. Various editions of Hydrography are reflected by those process steps in which the Hydrography Master layer is identified as both the Source Used and the Source Produced. Hydrography Master is in ArcInfo Coverage format.
Beginning date: 1969
Ending date: 1984
Currentness reference:
Publication dates of the USGS 7.5 minute topographic quadrangle maps for the State of Connecticut through 1984.
Process Step 9
Process description:
Named waterbody attribute enhancements - Previously undetected errors with STREAM_NO, STREAM_NO2, LAKE_NO, LAKE_NO2, BAY_NO, BAY_NO2 HARBOR_NO, HARBOR_NO2, SOUND_NO, and SOUND_NO2 attribute values were corrected by individually selecting, highlighting, zooming to, and inspecting features for each named waterbody. Resolving errors with these attribute values ocassionally uncovered features with errors with HYARC_COD and HYPOLY_COD attribute values, which were also corrected. Errors were discovered and corrected for hundreds of features. Two new fields, NAMEDA_COD and NAMEDP_COD and their decode fields, NAMED_ARC and NAMED_POLY, were added to easily distinguish named from unnamed waterbody features. The SCALELEVEL attribute was added to define scale range levels for Hydrography polygon and line features. Using Arc Macro Language (AML), an automated process (MAKECOVER.AML) was developed to maintain consistent attribute values by programmatically joining lookup data tables to decode numeric code fields and basing certain attribute information on polygon and line feature topology relationships. The MAKECOVER.AML also created this particular copy of Hydrography that is clipped to the State of Connecticut boundary.
Organization: State of Connecticut, Department of Environmental Protection
Person: Howie Sternberg
Phone: 860-424-3540
Address type: mailing and physical address
Address:
79 Elm Street
City: Hartford
State or Province: Connecticut
Postal code: 06106
Country: USA
Process date: 2004-2005
Process software and version: ArcInfo 8, ArcView 3.3
Data Source used
Source 4 - Hydrography Master
Title: Connecticut Hydrography Master layer
Originators: State of Connecticut, Department of Environmental Protection (data editor and publisher)
U.S. Geological Survey, National Mapping Program (data compiler)
Publisher: State of Connecticut, Department of Environmental Protection
Publication place: Hartford, Connecticut, USA
Publication date: 19940101
Data type: vector digital data
Data location: http://www.ct.gov/deep
Map scale denominator: 24000
Media: disc
Source contribution:
Hydrography Master is a 1:24,000-scale, polygon and line feature-based layer that includes all hydrography features depicted on all of the U.S. Geological Survey (USGS) 7.5 minute topographic quadrangle maps that cover the State of Connecticut. This data source refers to all Hydrography features combined in one statewide layer. Since initial publication in 1994, subsequent editions of the Hydrography Master layer were generated by the State of Connecticut in order to change data format, convert from NAD 27 to NAD 83, and improve the quality and accuracy of both feature geometry and feature attribute information. Consequently, over a period of many years, different versions of the Hydrography Master layer were produced. Various editions of Hydrography are reflected by those process steps in which the Hydrography Master layer is identified as both the Source Used and the Source Produced. Hydrography Master is in ArcInfo Coverage format.
Beginning date: 1969
Ending date: 1984
Currentness reference:
Publication dates of the USGS 7.5 minute topographic quadrangle maps for the State of Connecticut through 1984.
Data Source produced
Source 4 - Hydrography Master
Title: Connecticut Hydrography Master layer
Originators: State of Connecticut, Department of Environmental Protection (data editor and publisher)
U.S. Geological Survey, National Mapping Program (data compiler)
Publisher: State of Connecticut, Department of Environmental Protection
Publication place: Hartford, Connecticut, USA
Publication date: 19940101
Data type: vector digital data
Data location: http://www.ct.gov/deep
Map scale denominator: 24000
Media: disc
Source contribution:
Hydrography Master is a 1:24,000-scale, polygon and line feature-based layer that includes all hydrography features depicted on all of the U.S. Geological Survey (USGS) 7.5 minute topographic quadrangle maps that cover the State of Connecticut. This data source refers to all Hydrography features combined in one statewide layer. Since initial publication in 1994, subsequent editions of the Hydrography Master layer were generated by the State of Connecticut in order to change data format, convert from NAD 27 to NAD 83, and improve the quality and accuracy of both feature geometry and feature attribute information. Consequently, over a period of many years, different versions of the Hydrography Master layer were produced. Various editions of Hydrography are reflected by those process steps in which the Hydrography Master layer is identified as both the Source Used and the Source Produced. Hydrography Master is in ArcInfo Coverage format.
Beginning date: 1969
Ending date: 1984
Currentness reference:
Publication dates of the USGS 7.5 minute topographic quadrangle maps for the State of Connecticut through 1984.
Process Step 10
Process description:
Create 2005 Edition of Hydrography - The automated process (software program), MAKECOVER.AML, developed for the previous process step was executed in 2005 in order to create a 2005 edition (copy) of Hydrography that captures recent corrections and enhancements