The National Map - Hydrography

Fact Sheet 2009-3054
By:  and 



The National Hydrography Dataset (NHD) is the surface-water component of The National Map. The NHD is a comprehensive set of digital spatial data that represents the surface water of the United States using common features such as lakes, ponds, streams, rivers, canals, streamgages, and dams. Polygons are used to represent area features such as lakes, ponds, and rivers; lines are used to represent linear features such as streams and smaller rivers; and points are used to represent point features such as streamgages and dams. Lines also are used to show the water flow through area features such as the flow of water through a lake. The combination of lines is used to create a network of water and transported material flow to allow users of the data to trace movement in downstream and upstream directions.
Publication type Report
Publication Subtype USGS Numbered Series
Title The National Map - Hydrography
Series title Fact Sheet
Series number 2009-3054
DOI 10.3133/fs20093054
Edition -
Year Published 2009
Language ENGLISH
Publisher U.S. Geological Survey
Contributing office(s) National Geospatial Technical Operations Center
Description 4 p.
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