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Wednesday, March 27 • 14:30 - 15:00
The National Hydrography Dataset (NHD) and National Hydrography Dataset Plus High Resolution

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The National Hydrography Dataset (NHD) is the U.S. Geological Survey’s geospatial dataset used to portray surface water in The National Map. The NHD represents the drainage network with features such as rivers, streams, canals, lakes, ponds, coastline, dams, and streamgages. The NHD also includes a linear referencing system based on reach codes that functions like a street address, and network connectivity information that enable analysis and discovery of information upstream or downstream of a point of interest.
The National Hydrography Dataset Plus (NHDPlus) enhances the NHD by incorporating two other USGS datasets, seamless elevation data from the 3D Elevation Program (3DEP), and delineations of drainage divides from the Watershed Boundary Dataset (WBD). The NHDPlus comprises an integrated suite of hydrologic geospatial data sets, including a hydrographic stream network, polygonal catchment areas representing incremental drainage areas for each stream network element, and Digital Elevation Model (DEM) derivatives including flow direction and flow accumulation grids. The USGS and U.S. Environmental Protection Agency (USEPA) collaborated to produce two versions of the National Hydrography Dataset Plus (NHDPlus V1 and NHDPlus V2), using the Medium-Resolution NHD at 1:100,000 scale, 30-meter elevation data from 3DEP, and WBD. Now the USGS has begun work on NHDPlus High Resolution (NHDPlus HR), which uses techniques and software from NHDPlus V2 with the NHD High Resolution (1:24,000-scale or better), 10-meter elevation data from 3DEP, and WBD.
This presentation will provide an introduction to both NHD and NHDPlus HR, as well as current production status and plans for NHDPlus HR.

Presenters
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Alan Rea

US Geological Survey, USGS National Geospatial Program


Wednesday March 27, 2019 14:30 - 15:00
Bitterroot Room Red Lion Downtowner, 1800 W Fairview Ave

Attendees (4)