Contents
Is the NHD included in the hydrography feature dataset?
The NHD file geodatabase download contains NHD data in the Hydrography feature dataset. It also includes the WBD in a second feature dataset. NHDFlowline is the fundamental flow network consisting predominantly of stream/river and artificial path vector features.
How is the NHD high resolution data used?
These data are updated and maintained through Stewardship partnerships with states and other collaborative bodies. The NHD High Resolution, along with the Watershed Boundary Dataset (WBD) and 3D Elevation Program (3DEP) data, is used to create the NHDPlus High Resolution.
Which is a feature of the NHD line?
NHD Line features NHDFlowline is the fundamental flow network consisting predominantly of stream/river and artificial path vector features. It represents the spatial geometry, carries the attributes, and contains linear referencing measures for locating features or “events” on the network.
How are waterbodies represented in NHD waterbody?
Waterbodies such as lake/pond features are represented in NHDWaterbody. They portray the spatial geometry and the attributes of the feature. These water polygons may have NHDFlowline artificial paths drawn through them to allow the representation of water flow direction.
Where can I download the NHD datasets?
NHDPlus HR raster data files are available for download as zipped (.7z) files. All NHD downloads contain a copy of the corresponding WBD dataset that is current only to the date the NHD dataset was created. The NHD can be directly downloaded in shapefile or file geodatabase (GDB) format by Hydrologic Unit (HU), state, or the entire nation.
Which is Geodatabase file contains NHD and wbd data?
The shapefile download simplifies this structure by containing all of the feature classes as separate shapefiles and tables as separate data files. The NHD file geodatabase download contains NHD data in the Hydrography feature dataset. It also includes the WBD in a second feature dataset.
When was the USGS hydrography data set created?
In the late 1990s, the USGS and the US EPA collaborated to produce the medium resolution National Hydrography Dataset at 1:100,000 scale for the conterminous U.S.
Where can I download the National Hydrography product?
The National Map Download viewer provides an online mapping tool for downloading the NHDPlus HR, NHD and WBD as a shapefile or file geodatabase by Hydrologic Unit (HU), including 4-digit Hydrologic Unit (HU4) or 8-digit Hydrologic Unit (HU8), by state, or nationally.
Which is the most current version of the National Hydrography data?
The most current version of the National Hydrography Dataset, the NHD High Resolution, is mapped at a scale of 1:24,000 scale or better (1:63,360 or better in Alaska). These data are updated and maintained through Stewardship partnerships with states and other collaborative bodies.