Original hydrographic data were compiled to meet National Map Accuracy standards. These standards have been maintained in the process of creating the NHD. At 1:100,000 scale, ninety percent of well-defined features are within 167 feet (0.02 inches at map scale) of their true geographic position. When higher resolution data are created and submitted, the positional accuracy may vary due to processing procedures of the contributing sources. USGS Map Accuracy standards for 1:24,000 scale require ninety percent of well-defined features to lie within 40 feet of their true geographic position.
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How do I download hydrography data products?
Download USGS hydrography data (datasets representing U.S. surface water for mapping and modeling applications) using The National Map Downloader or using download links that are listed at Access National Hydrography Products. Learn more: The National Map: Hydrography Training Videos National Hydrography Dataset User Guide For streamflow data, see: Where can I get real-time and historical...
How should I cite datasets and services from The National Map?
The USGS does not require a specific format when citing data obtained through The National Map. You should follow the citation guidelines provided by instructors or publication editors as appropriate. The following should help you find the information that you need: Citation for Datasets Author: U.S. Geological Survey Release date: the first four numbers of <pubdate> from dataset metadata for the...
What formats are available for hydrography data products in The National Map?
Depending on the product type, hydrography data are offered in Esri File Geodatabase 10.1, Shapefile or GeoPackage formats. National Hydrography Dataset (NHD) data is available as national extracts, state extracts, 4-digit sub-regions, 8-digit sub-basins, or in a specified extent from The National Map Downloader. A national extent of medium and high resolution NHD data in File Geodatabase format...
What sources were used to produce the National Hydrography Dataset (NHD)?
The National Hydrography Dataset (NHD) is a combination of USGS hydrologic digital line graph (DLG) files and Environmental Protection Agency (EPA) reach files, version 3.0 (RF3). U.S. Forest Service Cartographic Feature Files (CFF) and USGS Tagged Vector Hydro (TVH) captured from 7.5-minute printed maps were also used. Some states also contributed their own stream layer data to the compilation of...
What is the National Hydrography Dataset (NHD)?
The National Hydrography Dataset (NHD) is a digital vector dataset used by Geographic Information Systems (GIS) to define the spatial locations of surface waters and is designed to provide comprehensive coverage of surface water data for the U.S. The NHD contains features such as lakes, ponds, streams, rivers, canals, dams, and stream gages in a relational database model system. These data are...
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- FAQ
How do I download hydrography data products?
Download USGS hydrography data (datasets representing U.S. surface water for mapping and modeling applications) using The National Map Downloader or using download links that are listed at Access National Hydrography Products. Learn more: The National Map: Hydrography Training Videos National Hydrography Dataset User Guide For streamflow data, see: Where can I get real-time and historical...
How should I cite datasets and services from The National Map?
The USGS does not require a specific format when citing data obtained through The National Map. You should follow the citation guidelines provided by instructors or publication editors as appropriate. The following should help you find the information that you need: Citation for Datasets Author: U.S. Geological Survey Release date: the first four numbers of <pubdate> from dataset metadata for the...
What formats are available for hydrography data products in The National Map?
Depending on the product type, hydrography data are offered in Esri File Geodatabase 10.1, Shapefile or GeoPackage formats. National Hydrography Dataset (NHD) data is available as national extracts, state extracts, 4-digit sub-regions, 8-digit sub-basins, or in a specified extent from The National Map Downloader. A national extent of medium and high resolution NHD data in File Geodatabase format...
What sources were used to produce the National Hydrography Dataset (NHD)?
The National Hydrography Dataset (NHD) is a combination of USGS hydrologic digital line graph (DLG) files and Environmental Protection Agency (EPA) reach files, version 3.0 (RF3). U.S. Forest Service Cartographic Feature Files (CFF) and USGS Tagged Vector Hydro (TVH) captured from 7.5-minute printed maps were also used. Some states also contributed their own stream layer data to the compilation of...
What is the National Hydrography Dataset (NHD)?
The National Hydrography Dataset (NHD) is a digital vector dataset used by Geographic Information Systems (GIS) to define the spatial locations of surface waters and is designed to provide comprehensive coverage of surface water data for the U.S. The NHD contains features such as lakes, ponds, streams, rivers, canals, dams, and stream gages in a relational database model system. These data are...
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