Information used to reference the data.
Title: Connecticut Hydrography Network Line
Originators: State of Connecticut, Department of Environmental Protection (data editor, publisher, compiler)
U.S. Geological Survey, National Mapping Program (data compiler)
Publisher: State of Connecticut, Department of Environmental Protection
Publication place: Hartford, Connecticut, USA
Publication date: 20000101
Edition: 2005
Data type: vector digital data
Other citation details: The USGS is the collector of the data (compiler) that is the basis for Hydrography Network. 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 2000. However, the 2005 Edition differs from information published in 2000 primarily as a result of the addition of metadata. This layer includes information that is relatively static and does not change over time. Data compiled at 1:24,000 scale. The 2005 Edition is the last version of this data layer.
A characterization of the data, including its intended use and limitations.
Abstract: Hydrography Network is a 1:24,000-scale, line feature-based layer that is composed of line hydrography features and centerlines for polygon hydrography features depicted on the U.S. Geological Survey (USGS) 7.5 minute topographic quadrangle maps for the State of Connecticut. It is a single-line model of Connecticut's hydrography indicating hydrologic connectivity and direction of flow. This data layer is a subset of hydrography features from the 1:24,000-scale DEP Hydrography layer (based on the topographic maps) plus connecting lines in place of marshes, small ponds and gaps. There are no polygon features. The Hydrography Network is composed of three sets of lines: 1) line hydrography features for single-line rivers, streams, canals and ditches, 2) computer generated centerline representations for the polygon hydrography features for rivers, streams, brooks, reservoirs, lakes, ponds, bays, coves, and harbors and 3) digitized centerlines for the polygon hydrography feature for marshes and connectors where the actual stream channel does not appear in the Hydrography layer but can be inferred reasonably from the topographic maps. Only hydrography features that are part of the surface water drainage are included. Isolated lakes and ponds without obvious or inferable connection to the streams, marshes at headwaters, and manmade features such as aqueducts or canals were not centerlined or included. In cases of multiple paths through a section of hydrography (i.e. multiple outlets from a lake to the same river or a braided stream), a single path was chosen and used. For lake headwaters the centerline begins at the center of the far shore. The centerlines were generated based on the shoreline of water polygons after removal of island, rocks, tidal flats, etc., consequently lines will run across some islands when displayed with the Hydrography layer. All line features are oriented from headwater to outlet (in the ArcInfo coverage) for use in upstream/downstream tracing. The Hydrography Network layer is based on Hydrography layer 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 composed of codes to identify hydrography network features by major drainage basin. The layer does not include reach code or stream order attribute information. The Hydrography Network is fully hydrologically connected within each major basin and where major basins flow into each other within the State of Connecticut. This layer was originally published in 2000. The 2005 edition includes the same water features published in 2000. For stream modeling, routing, and analysis work this data is supplanted by the more detailed National Hydrography Dataset (NHD) published by the U.S. Geological Survey. The 2005 Edition is the last version of the DEP Hydrography Network data layer.
Purpose: Hydrography Network is 1:24,000-scale hydrologic model data. It represents a hydrologically connected, directional model of the hydrography information published on the USGS topographic quadrangle maps. Use this layer with other 1:24,000-scale base map data such as Roads and Trails, Railroads, Airports, and Towns. The Hydrography Network layer is not intended for maps printed at map scales greater or more detailed than 1:24,000 scale (1 inch = 2,000 feet). For stream modeling, routing, and analysis work this data is supplanted by the more detailed National Hydrography Dataset (NHD) published by the U.S. Geological Survey. The Hydrography Network layer could be used for simple applications where stream connectivity and flow direction (in the ArcInfo coverage) are important but the detail, attributes and complexity of NHD are not needed.
Language of dataset: en
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@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
How the data are represented, formatted and maintained by the data producing organization.
File or table name: depgis.DEP.HYDROGRAPHYNETWORK_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(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.
The state of and maintenance information for the data.
Data status: Complete
Update frequency: None planned
Words or phrases that summarize certain aspects of the data.
Theme:
Keywords: centerline, flow direction, large scale, hydrography, network
Keyword thesaurus: None
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.
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 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 Network layer, compiled and published by CT DEP and USGS. Source map scale is 1:24,000.