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Tidal Wetlands 1990s
SDE Feature Class - depgis.DEP.TIDAL_WETLANDS_1990S
FGDC, ESRI Metadata
DescriptionGraphicSpatialData StructureData QualityData SourceData DistributionMetadata
+ Resource Description
Citation
Information used to reference the data.
Title: Tidal Wetlands 1990s
Originators: State of Connecticut, Department of Environmental Protection (data compiler, editor and publisher)
Publisher: State of Connecticut, Department of Environmental Protection
Publication place: Hartford, Connecticut, USA
Publication date: 1999
Data type: vector digital data
Data location: http://www.ct.gov/deep
Other citation details: The State of Connecticut, Department of Environmental Protection is the collector of the data (compiler), the creator and maintainer of the data layer (editor), and producer (publisher) of this information for use. Data compiled at 1:12,000 scale.
Description
A characterization of the data, including its intended use and limitations.
Abstract: In 1995 it was recognized that current Connecticut tidal wetland boundary information was critical to ensure the appropriate management and protection of the tidal wetlands resource. At this time the 1970's maps had become increasingly dated, with the growth of new tidal wetland areas and the restoration of others. The maps were contributing to the confusion over state versus municipal wetland jurisdiction. It was in this climate that the current project was conceived. The aim of this mapping effort was to provide current, geometrically correct tidal wetland map products that would serve as a guide to the jurisdictional boundaries for federal, state and municipal regulators and private land holders.
'Tidal Wetlands' are defined as follows: 'Tidal Wetlands' means 'wetland' as defined by C.G.S.Sec. 22a-29. C.G.S.Sec.22a-93(7)(E). 'Wetland' means those areas which border or lie beneath tidal waters, such as, but not limited to banks, bogs, salt marshes, swamps, meadows, flats, or other low lands subject to tidal action, including those areas now or formerly connected to tidal waters, and whose surface is at or below an elevation of one foot above local extreme high water; and upon which may grow or be capable of growing some but not necessarily all, of the following: (See the statute for a complete listing of tidally influenced plant species) C.G.S.Sec.22a-29(2).
Thus, the actual tidal wetland boundary is determined by the application of these criteria, including identifying the presence or absence of tidally influenced plants. While the field determination of these criteria results in the most accurate tidal wetland boundary delineation, the identification of different plant types and low lying areas can also be achieved, at a high level of accuracy, through the use of large scale, stereo aerial photography. This latter method was determined as being the most efficient method to delineate vegetated tidal wetlands across the entire state of Connecticut. It should be noted that similarly to the previous tidal wetlands mapping efforts, no attempt was made to delineate those areas that were formerly connected to tidal flow, as these areas are difficult to identify by either field or photo interpretation techniques.
The area mapped in the Tidal Wetlands 1990's datalayer includes all tidal, coastal and navigable waters and tidal wetlands of Connecticut with the exception of the Lower Connecticut River, which was mapped as part of the 1994 Ramsar Convention program. Between both programs, a total of 15,178 acres of tidal wetlands were mapped.
Purpose: Tidal Wetlands 1990's is 1:12,000-scale data. Use this layer to depict the location of tidal wetlands as they existed in the 1990's. Not intended for maps printed at map scales greater or more detailed than 1:12,000 scale (1 inch = 1,000 feet.)
Supplemental information: The emphasis of this mapping was to capture more detail regarding the emergent wetland areas. It provides a higher level of detail regarding emergent wetlands areas than the the 1970's mapping that combined open waters, tidal creeks and emergent wetlands into single polygons. This approach is most useful in areas such as western LIS where low marsh is gradually drowning.
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: Kevin O'Brien
Phone: 860-424-3034
Fax: 860-424-4054
Email: dep.gisdata@ct.gov
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: 06106-5127
Country: USA
Data Type
How the data are represented, formatted and maintained by the data producing organization.
File or table name: depgis.DEP.TIDAL_WETLANDS_1990S
Data type: vector digital data
Data format: SDE Feature Class
Native dataset environment: Microsoft Windows XP Version 5.1 (Build 2600) Service Pack 3; ESRI ArcCatalog 9.3.1.3000
Time Period of Data
Time period(s) for which the data corresponds to the currentness reference.
Beginning date: 1990
Ending date: 1999
Currentness reference: ground condition
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: biota, boundaries, environment
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. No restrictions or legal prerequisites for accessing the data. The data is in the public domain and may be redistributed.
Use constraints: The acreage from this mapping is not intended to represent the acreage of tidal wetlands which includes the open water of large internal tidal ponds and tidal creeks, which are an integral component/habitat of tidal wetland. The acreage of wetlands from this report are on the order of 2000 acres less than that computed from the 1970's mapping. When examining the two data layers, this difference should not be interpreted as wetland loss nor should the numbers from this data be used to describe the total acres of tidal wetland in CT.
No restrictions or legal prerequisites for using the data after access is granted. The data is suitable for use at appropriate scale, and is not intended for maps printed at scales greater or more detailed than 1:12,000 scale (1 inch = 1,000 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 as the source for this information.
These data are suitable for planning purposes only, and should not be used to make regulatory or jurisdictional boundary determinations.
Data Security Information
Handling restrictions imposed on the data because of national security, privacy or other concerns.
Security classifiction system: None
Security classification: None
Security handling: No restrictions for handling the data.
+ Graphic Example
Browse Graphic
Graphic illustration of the data.
Browse graphic 1
Open - Full View of Tidal Wetlands 1990's
Graphic Image
Browse graphic 2
Open - Detail view of Tidal Wetlands 1990's
Graphic Image
Browse graphic 3
Open - Displays the project area, based on the originator.
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
Left749216.188000 (survey feet)
Right1252511.875000 (survey feet)
Top835028.000000 (survey feet)
Bottom554925.750000 (survey feet)
In Unprojected coordinates (geographic)
GCS North American 1983
BoundaryCoordinate
West-73.669037 (longitude)
East-71.824631 (longitude)
North41.752808 (latitude)
South40.980412 (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 boundaries of tidal wetlands that were compiled in 1995. Information encoded about these features includes a class code, a legend field, and an acreage field. Use the AV_LEGEND attribute to symbolize features by type on a map. The Class attribute is the code that corresponds to the values in Av_Legend. The Acreage attribute denotes the size of the feature in acres.
Direct spatial reference method: Vector
Attributes of depgis.DEP.TIDAL_WETLANDS_1990S
Detailed descriptions of entity type, attributes, and attribute values for the data.
Name: depgis.DEP.TIDAL_WETLANDS_1990S
Type of object: Feature Class
Geometry type: Polygon
Number of records: 2827
Description: Tidal Wetlands 1990's represented as polygon features.
Source: State of Connecticut, Department of Environmental Protection
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
AV_LEGEND
Definition: Description of area in terms of wetland or upland.
Alias: AV_LEGEND Type: String Width: 20 Precision: 0 Scale: 0
Beginning date of attribute values: 1969
Ending date of attribute values: 1975
Attribute domain values
ValueDefinition
UplandUpland area.
Definition Source: Connecticut Department of Environmental Protection
Tidal WetlandTidal wetland area.
Definition Source: Connecticut Department of Environmental Protection
Attribute definition source: Connecticut Department of Environmental Protection
CLASS
Definition: The code that specifies an area as either tidal wetland or upland.
Alias: CLASS Type: SmallInteger Width: 2 Precision: 5 Scale: 0
Attribute domain values
ValueDefinition
111Tidal Wetland Area
Definition Source: Connecticut Department of Environmental Protection
0Not a tidal wetland area; upland area.
Definition Source: Connecticut Department of Environmental Protection
Attribute definition source: Connecticut Department of Environmental Protection
ACREAGE
Definition: Size of polygon in acres.
Alias: ACREAGE Type: Double Width: 8 Precision: 14 Scale: 3
Attribute values: Calculated numbers in acreage.
Attribute definition source: Connecticut Department of Environmental Protection
SOURCE
Definition: Source used when digitizing the polygons.
Alias: SOURCE Type: String Width: 30 Precision: 0 Scale: 0
Attribute domain values
ValueDefinition
Null valueNo source specificed
Definition Source: Connecticut Department of Environmental Protection
OLISP 1995 Air PhotosThe 1995 Air Photos from the Office of Long Island Sound Programs was used as a digitizing source.
Definition Source: Connecticut Department of Environmental Protection
Attribute definition source: Connecticut Department of Environmental Protection
SHAPE
Definition: Feature geometry.
Alias: Shape Type: Geometry Width: 4 Precision: 0 Scale: 0
Attribute values: Coordinates defining the features.
Attribute definition source: ESRI
SHAPE.area
Definition: Area of polygon in square feet
Alias: SHAPE.area Type: Double Width: 0 Precision: 0 Scale: 0
Attribute values: Automatically generated.
Attribute definition source: ESRI
SHAPE.len
Definition: Perimeter of polygon in feet.
Alias: SHAPE.len Type: Double Width: 0 Precision: 0 Scale: 0
Attribute values: Automatically generated.
Attribute definition source: ESRI
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.TIDAL_WETLANDS_1990S
ESRI feature type: Simple
Geometry type: Polygon
Topology: FALSE
Feature count: 2827
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.TIDAL_WETLANDS_1990S
Type: G-polygon
Count: 2827
+ 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.
Establishment of logical consistency was performed by the State of Connecticut, Department of Environmental Protection using ESRI ArcGIS software to manually create and control feature topology in SHAPEFILE format. No automated procedures or tests were performed to guarantee desired topology other than visual inspection.
Completeness report: The completeness of the data reflects the feature content of the data sources, which include maps, CAD files, and previous digital data. The TIDAL_WETLANDS_1990S layer is complete in the sense that it accurately reflects the contents of the information available at the time the State of Connecticut, Department of Environmental Protection created the layer. However, compared to current conditions, the TIDAL_WETLANDS_1990S layer may not be accurate. This data is not updated.
Attribute Accuracy
Accuracy of the identification of data entities, features and assignment of attribute values.
Attribute accuracy report: The TIDAL_WETLANDS_1990S layer retains the feature types and information identified by the State of Connecticut, Department of Environmental Protection and obtained from the maps & reports. All attributes have valid values. Values are within defined domains.
The ACREAGE (area in acres) field was automatically calculated for each polygon feature based on computer generated feature area in square feet.
Positional Accuracy
Accuracy of the positional aspects of the data.
Horizontal accuracy report: The horizontal positional accuracy of this data is unknown.
+ Data Source and Process Information
Data Sources
Information about the source data used to construct or derive the data.
Data source information
Source 1 - False Color Infrared Stereo Aerial Photographs
Title: False Color Infrared Stereo Aerial Photographs
Originators: State of Connecticut Department of Environmental Protection
Publisher: State of Connecticut, Department of Environmental Protection
Publication place: Hartford, Connecticut, USA
Publication date: 1995, 1990, 1986, 1981
Data type: map
Map scale denominator: 1:12,000
Media: paper
Source contribution: These photographs were used with a stereoscope to identify areas of tidal wetlands based on vegetation growth that displays on infrared images.
Date: 1995
Date: 1990
Date: 1986
Date: 1981
Currentness reference: ground condition
Source 2 - 1970's Tidal Wetlands datalayer
Title: 1970's Tidal Wetlands
Originators: State of Connecticut, Department of Environmental Protection (data compiler, editor and publisher)
Publisher: State of Connecticut, Department of Environmental Protection
Publication place: Hartford, Connecticut, USA
Publication date: Unpublished Material
Data type: vector digital data
Data location: http://www.ct.gov/deep
Map scale denominator: 1:24,000
Media: disc
Source contribution: The precursor to the 1990's Tidal Wetlands data upon which the current data was overlaid to detect omissions and/or to reinforce accuracy in ambiguous locations.
Beginning date: 1960's
Ending date: 1974
Currentness reference: ground condition
Source 3 - National Wetlands Inventory, Coastal Photo Interpretation
Title: National Wetlands Inventory, Coastal Photo Interpretation
Originators: Connecticut Department of Environmental Protection
Data location: http://www.ct.gov/deep
Map scale denominator: 1:12,000
Media: Photos
Source contribution: This inventory mapping was used as an additional verification source, although it is not rectified and exists only as a series of transparent overlays to the 1981 aerial photographs.
Date: 1981
Source 4 - Groton-New London Airport Wetlands Mapping CAD Files
Title: Groton-New London Airport Wetlands Mapping CAD Files
Map scale denominator: Varied
Media: Maps
Source contribution: These CAD files were produced from detailed field survey and delineation, but do not differentiate between tidal and inland wetlands. Used as a reference only.
Date: 1996
Source 5 - Tweed New Haven Airfield Tidal Wetlands Mapping
Title: Tweed New Haven Airfield Tidal Wetlands Mapping
Map scale denominator: 1:2,400
Media: Maps
Source contribution: This is an extensive area of tidal wetlands that had been drained by tide gates. A model was used to determine the upstream limits of tidal action in the absence of the tide gates under a 1 year frequency tidal flood to determine the extent of potentially restorable tidal wetlands. Used as a reference only.
Date: 1997
Source 6 - 1990 Digital Orthophoto Quarter Quadrangles
Title: 1990 Digital Orthophoto Quarter Quadrangles
Publication date: 1999
Data location: http://www.ct.gov/deep
Map scale denominator: 1:12,000
Media: disc
Source contribution: Used as a base for the digitizing phase.
Date: 1990
Source 7 - Preliminary ArcEdit Coverage of Tidal Wetlands 1990's
Title: Preliminary ArcEdit Coverage of Tidal Wetlands 1990's
Originators: Connecticut Department of Environmental Protection
Publication date: 1999
Map scale denominator: 1:12,000
Media: disc
Source contribution: Preliminary digital Coverage
Date: 1999
Source 8 - ArcEdit Coverage, Tidal Wetlands 1990s
Title: ArcEdit Coverage, Tidal Wetlands 1990s
Originators: Connecticut Department of Environmental Protection
Publication date: 1999
Map scale denominator: 1:12,000
Media: disc
Source contribution: Final Product in ArcEdit Coverage format.
Source 9 - Tidal Wetlands 1990s Shapefile
Title: Tidal Wetlands 1990s Shapefile
Originators: Connecticut Department of Environmental Protection
Publication date: 1999
Map scale denominator: 1:12,000
Media: disc
Source contribution: Conversion to ArcView Shapefile format, NAD 83.
Source 10 - Tidal Wetlands 1990s, SDE Feature Class
Title: Tidal Wetlands 1990s, SDE Feature Class
Originators: Connecticut Department of Environmental Protection
Publication date: 2009
Data location: http://www.ct.gov/deep
Map scale denominator: 1:12,000
Media: disc
Source contribution: Final SDE Feature Class.
Currentness reference: 1999
Process Steps
Information about events, parameters, tolerances and techniques applied to construct or derive the data.
Process step information
Process Step 1
Process description: Identifying Tidal Wetlands on 1995 False Color Infrared Maps
Before mapping could begin it was necessary to develop skills in interpreting the 1995 aerial photographs, which were chosen as the primary data source for the tidal wetland boundary information. False color infrared imagery is particularly useful for discriminating vegetation types, and the summer date of the 1995 photographs ensured that the wetland vegetation would have a strong infrared response. Accuracy and consistency at interpreting aerial photographs was developed by looking at the color and texture characteristics of the photographs for areas known to be tidal wetlands.
Photo interpretation was done using a stereoscope with either 3 or 8 times magnification lenses. In most cases the 3 times magnification lens was adequate to identify the tidal wetlands. The higher magnification lens was only used if the area was particularly difficult to interpret. The use of stereo imagery greatly assisted the interpretation of tidal wetlands, as low lying areas and vegetation textures become very distinct when viewed through a stereoscope. If the aerial photographs were difficult to interpret, assistance from other reference sources, such as previous mapping of the area (1970's Tidal Wetlands data), previous aerial photographs or site knowledge, was sought. If the boundary of the tidal wetland was not clear, after reference to all of these sources, the site was inspected in the field.
Organization: State of Connecticut, Department of Environmental Protection
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: 1995-1999
Data Source used
Source 1 - False Color Infrared Stereo Aerial Photographs
Title: False Color Infrared Stereo Aerial Photographs
Originators: State of Connecticut Department of Environmental Protection
Publisher: State of Connecticut, Department of Environmental Protection
Publication place: Hartford, Connecticut, USA
Publication date: 1995, 1990, 1986, 1981
Data type: map
Map scale denominator: 1:12,000
Media: paper
Source contribution: These photographs were used with a stereoscope to identify areas of tidal wetlands based on vegetation growth that displays on infrared images.
Date: 1995
Date: 1990
Date: 1986
Date: 1981
Currentness reference: ground condition
Source 2 - 1970's Tidal Wetlands datalayer
Title: 1970's Tidal Wetlands
Originators: State of Connecticut, Department of Environmental Protection (data compiler, editor and publisher)
Publisher: State of Connecticut, Department of Environmental Protection
Publication place: Hartford, Connecticut, USA
Publication date: Unpublished Material
Data type: vector digital data
Data location: http://www.ct.gov/deep
Map scale denominator: 1:24,000
Media: disc
Source contribution: The precursor to the 1990's Tidal Wetlands data upon which the current data was overlaid to detect omissions and/or to reinforce accuracy in ambiguous locations.
Beginning date: 1960's
Ending date: 1974
Currentness reference: ground condition
Process Step 2
Process description: Digitizing the Tidal Wetlands Boundaries onto Digital Orthophoto Quarter Quadrangles
Digital orthophoto quarter quadrangles were displayed in ARCEDIT and overlaid with the 1970's digitial tidal wetlands coverage. The equivalent tidal wetland boundaries that were interpreted from the 1995 aerial photographs were located on the DOQQ image, and digitized on-screen or on-the-fly in ARCEDIT. The DOQQ image could be viewed and digitized at a range of scales. Generally most of the digitizing was performed at 1:6,000 scale, although larger scales were used for smaller tidal wetland polygons, or in areas where the tidal wetland boundary was less distinct. All tidal wetland areas larger than 400 square feet were identified and digitized. Large waterbodies were excluded from the mapping although creeks, streams and ditches narrower than 40 feet were included. In instances where the boundary was not visible on the digital orthophoto, the location of the boundary was interpolated from its proximity to other features that could be seen on both the aerials and the DOQQ image. The 1970's coverage was used for reference and orientation purposes, and the 1981 NWI Coastal Inventory data was used as reference material to ensure that no previously mapped areas would be overlooked.
The use of the DOQQ's as a base map eliminated the usual rectification phase of the mapping process which is necessary if the wetland boundaries are mapped directly from the aerial photographs. Unlike the aerial photographs, the DOQQ's have been geometrically corrected and thus provide the best representation of topographic features for mapping purposes. The use of the DOQQ's as a mapping base saved time and increased the accuracy of the mapping process.
Organization: State of Connecticut, Department of Environmental Protection
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: 1996
Process software and version: ArcEdit
Data Source used
Source 1 - False Color Infrared Stereo Aerial Photographs
Title: False Color Infrared Stereo Aerial Photographs
Originators: State of Connecticut Department of Environmental Protection
Publisher: State of Connecticut, Department of Environmental Protection
Publication place: Hartford, Connecticut, USA
Publication date: 1995, 1990, 1986, 1981
Data type: map
Map scale denominator: 1:12,000
Media: paper
Source contribution: These photographs were used with a stereoscope to identify areas of tidal wetlands based on vegetation growth that displays on infrared images.
Date: 1995
Date: 1990
Date: 1986
Date: 1981
Currentness reference: ground condition
Source 2 - 1970's Tidal Wetlands datalayer
Title: 1970's Tidal Wetlands
Originators: State of Connecticut, Department of Environmental Protection (data compiler, editor and publisher)
Publisher: State of Connecticut, Department of Environmental Protection
Publication place: Hartford, Connecticut, USA
Publication date: Unpublished Material
Data type: vector digital data
Data location: http://www.ct.gov/deep
Map scale denominator: 1:24,000
Media: disc
Source contribution: The precursor to the 1990's Tidal Wetlands data upon which the current data was overlaid to detect omissions and/or to reinforce accuracy in ambiguous locations.
Beginning date: 1960's
Ending date: 1974
Currentness reference: ground condition
Source 3 - National Wetlands Inventory, Coastal Photo Interpretation
Title: National Wetlands Inventory, Coastal Photo Interpretation
Originators: Connecticut Department of Environmental Protection
Data location: http://www.ct.gov/deep
Map scale denominator: 1:12,000
Media: Photos
Source contribution: This inventory mapping was used as an additional verification source, although it is not rectified and exists only as a series of transparent overlays to the 1981 aerial photographs.
Date: 1981
Source 4 - Groton-New London Airport Wetlands Mapping CAD Files
Title: Groton-New London Airport Wetlands Mapping CAD Files
Map scale denominator: Varied
Media: Maps
Source contribution: These CAD files were produced from detailed field survey and delineation, but do not differentiate between tidal and inland wetlands. Used as a reference only.
Date: 1996
Source 5 - Tweed New Haven Airfield Tidal Wetlands Mapping
Title: Tweed New Haven Airfield Tidal Wetlands Mapping
Map scale denominator: 1:2,400
Media: Maps
Source contribution: This is an extensive area of tidal wetlands that had been drained by tide gates. A model was used to determine the upstream limits of tidal action in the absence of the tide gates under a 1 year frequency tidal flood to determine the extent of potentially restorable tidal wetlands. Used as a reference only.
Date: 1997
Source 6 - 1990 Digital Orthophoto Quarter Quadrangles
Title: 1990 Digital Orthophoto Quarter Quadrangles
Publication date: 1999
Data location: http://www.ct.gov/deep
Map scale denominator: 1:12,000
Media: disc
Source contribution: Used as a base for the digitizing phase.
Date: 1990
Data Source produced
Source 7 - Preliminary ArcEdit Coverage of Tidal Wetlands 1990's
Title: Preliminary ArcEdit Coverage of Tidal Wetlands 1990's
Originators: Connecticut Department of Environmental Protection
Publication date: 1999
Map scale denominator: 1:12,000
Media: disc
Source contribution: Preliminary digital Coverage
Date: 1999
Process Step 3
Process description: Cleaning the GIS Data
Once all the tidal wetland boundaries had been mapped, the ARCEDIT coverage had to be cleaned and edited to ensure all the wetland boundary arcs were closed to form area polygons. Once the wetland polygons were complete an item (class) was added to the polygon attribute table and coded. All tidal wetland polygons were given a class code of 111, consistent with the codes used in the lower Connecticut River wetland coverage. All other polygons, such as small inclusions of upland, were given a class code of 0.
Organization: State of Connecticut, Department of Environmental Protection
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: 1996
Process software and version: ArcEdit
Data Source used
Source 7 - Preliminary ArcEdit Coverage of Tidal Wetlands 1990's
Title: Preliminary ArcEdit Coverage of Tidal Wetlands 1990's
Originators: Connecticut Department of Environmental Protection
Publication date: 1999
Map scale denominator: 1:12,000
Media: disc
Source contribution: Preliminary digital Coverage
Date: 1999
Data Source produced
Source 8 - ArcEdit Coverage, Tidal Wetlands 1990s
Title: ArcEdit Coverage, Tidal Wetlands 1990s
Originators: Connecticut Department of Environmental Protection
Publication date: 1999
Map scale denominator: 1:12,000
Media: disc
Source contribution: Final Product in ArcEdit Coverage format.
Process Step 4
Process description: Converting the NAD 27 Coverage to a NAD 83 Shapefile
The original Coverage (Source 8) was created in the State Plane Coordinate System North American Datum (NAD) 1927. This was subsequently converted to a NAD 83 Shapefile Format
Organization: Connecticut Department of Environmental Protection
Phone: 860-424-3540
Fax: 860-424-4058
Email: dep.gisdata@ct.gov
Address type: mailing and physical address
Address: 79 Elm Street
City: Hartford
State or Province: CT
Postal code: 06106
Country: USA
Process date: 1999
Process software and version: ArcView 3
Data Source used
Source 8 - ArcEdit Coverage, Tidal Wetlands 1990s
Title: ArcEdit Coverage, Tidal Wetlands 1990s
Originators: Connecticut Department of Environmental Protection
Publication date: 1999
Map scale denominator: 1:12,000
Media: disc
Source contribution: Final Product in ArcEdit Coverage format.
Data Source produced
Source 9 - Tidal Wetlands 1990s Shapefile
Title: Tidal Wetlands 1990s Shapefile
Originators: Connecticut Department of Environmental Protection
Publication date: 1999
Map scale denominator: 1:12,000
Media: disc
Source contribution: Conversion to ArcView Shapefile format, NAD 83.
Process Step 5
Process description: Conversion to ArcSDE Feature Class
Organization: Connecticut Department of Environmental Protection
Phone: 860-424-3540
Fax: 860-424-4058
Email: dep.gisdata@ct.gov
Address type: mailing and physical address
Address: 79 Elm Street
City: Hartford
State or Province: CT
Postal code: 06106
Country: USA
Process date: 2009
Process software and version: ArcGIS 9
Data Source used
Source 9 - Tidal Wetlands 1990s Shapefile
Title: Tidal Wetlands 1990s Shapefile
Originators: Connecticut Department of Environmental Protection
Publication date: 1999
Map scale denominator: 1:12,000
Media: disc
Source contribution: Conversion to ArcView Shapefile format, NAD 83.
Data Source produced
Source 10 - Tidal Wetlands 1990s, SDE Feature Class
Title: Tidal Wetlands 1990s, SDE Feature Class
Originators: Connecticut Department of Environmental Protection
Publication date: 2009
Data location: http://www.ct.gov/deep
Map scale denominator: 1:12,000
Media: disc
Source contribution: Final SDE Feature Class.
Currentness reference: 1999
+ Data Distribution Information
General
Description of the data known by the party from whom the data may be obtained, liability of party distributing data, and technical capabilities required to use the data.
Resource description: Tidal Wetlands 1990s
Distribution liability: 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.
Technical prerequisites: Geographic information sytem (GIS), computer-aided drawing or other mapping software is necessary to display, view and access the information.
Distribution Point of Contact
Contact information for the individual or organization distributing the data.
Organization: State of Connecticut, Department of Enviromental Protection
Phone: 860-424-3540
Fax: 860-424-4058
Email: dep.gisdata@ct.gov
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: 06106-5127
Country: USA
Standard Order Process
Common ways in which data may be obtained.
Digital form:
Format name: Shapefile, Feature Class
Format version number: ArcGIS
File decompression technique: Zip file
Digital transfer option:
Online option:
Computer information:
Network address:
Network resource name: http://www.ct.gov/deep
Fees: An online copy of the data may be accessed without charge.
Custom Order Process
Description of custom distribution services available.
Custom order process: The data distributor does not provide custom GIS analysis or mapping services. Data is available in a standard format and may be converted to other formats, projections, coordinate systems, or selected for specific geographic regions by the party receiving the data.
+ Metadata Reference
Metadata Date
Dates associated with creating, updating and reviewing the metadata.
Last updated: 20120119
Language of metadata: en
Metadata Point of Contact
Contact information for the individual or organization responsible for the metadata information.
Organization: State of Connecticut, Department of Environmental Protection
Phone: 860-424-3540
Fax: 860-424-4058
Email: dep.gisdata@ct.gov
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: 06106-5127
Country: USA
Metadata Access Constraints
Restrictions and legal prerequisites for accessing or using the data after access is granted.
Access constraints: None. No restrictions or legal prerequisites for accessing the metadata.
Use constraints: None. No restrictions or legal prerequisites for using the metadata after access is granted.
Metadata Security Information
Handling restrictions imposed on the metadata because of national security, privacy or other concerns.
Security classifiction system: None
Security classification: None
Security handling: No restrictions for handling the metadata.
Metadata Standards
Description of the metadata standard used to document the data and reference to any additional extended profiles to the standard used by the metadata producer.
Standard name: FGDC Content Standards for Digital Geospatial Metadata
Standard version: FGDC-STD-001-1998
Time convention: local time
Metadata profiles defining additonal information:
Profile: ESRI Metadata Profile
Online linkage: http://www.esri.com/metadata/esriprof80.html
FGDC Plus Metadata Stylesheet
Stylesheet: FGDC Plus Stylesheet
File name: FGDC Plus.xsl
Version: 2.2
Description: This metadata is displayed using the FGDC Plus Stylesheet, which is an XSL template that can be used with ArcGIS software to display metadata. It displays metadata elements defined in the Content Standard for Digital Geospatial Metadata (CSDGM) - aka FGDC Standard, the ESRI Profile of CSDGM, the Biological Data Profile of CSDGM, and the Shoreline Data Profile of CSDGM. CSDGM is the US Federal Metadata standard. The Federal Geographic Data Committee originally adopted the CSDGM in 1994 and revised it in 1998. According to Executive Order 12096 all Federal agencies are ordered to use this standard to document geospatial data created as of January, 1995. The standard is often referred to as the FGDC Metadata Standard and has been implemented beyond the federal level with State and local governments adopting the metadata standard as well. The Biological Data Profile broadens the application of the CSDGM so that it is more easily applied to biological data that are not explicitly geographic (laboratory results, field notes, specimen collections, research reports) but can be associated with a geographic location. Includes taxonomical vocabulary. The Shoreline Data Profile addresses variability in the definition and mapping of shorelines by providing a standardized set of terms and data elements required to support metadata for shoreline and coastal data sets. The FGDC Plus Stylesheet includes the Dublin Core Metadata Element Set. It supports W3C DOM compatible browsers such as IE7, IE6, Netscape 7, and Mozilla Firefox. It is in the public domain and may be freely used, modified, and redistributed. It is provided "AS-IS" without warranty or technical support.
Instructions: On the top of the page, click on the title of the dataset to toggle opening and closing of all metadata content sections or click section links listed horizontally below the title to open individual sections. Click on a section name (e.g. Description) to open and close section content. Within a section, click on a item name (Status, Key Words, etc.) to open and close individual content items. By default, the Citation information within the Description section is always open for display.
Download: FGDC Plus Stylesheet is available from the ArcScripts downloads at www.esri.com.
Federal Geographic Data Committee