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Filters: Tags: {"type":"Place","scheme":"The National Map Place Thesaurus"} (X) > partyWithName: U.S. Geological Survey, National Geospatial Technical Operations Center (X) > Types: Citation (X)

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These vector contour lines are derived from the 3D Elevation Program using automated and semi-automated processes. They were created to support 1:24,000-scale CONUS and Hawaii, 1:25,000-scale Alaska, and 1:20,000-scale Puerto Rico / US Virgin Island topographic map products, but are also published in this GIS vector format. Contour intervals are assigned by 7.5-minute quadrangle, so this vector dataset is not visually seamless across quadrangle boundaries. The vector lines have elevation attributes (in feet above mean sea level on NAVD88), but this dataset does not carry line symbols or annotation
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The Watershed Boundary Dataset (WBD) from The National Map (TNM) defines the perimeter of drainage areas formed by the terrain and other landscape characteristics. The drainage areas are nested within each other so that a large drainage area, such as the Upper Mississippi River, will be composed of multiple smaller drainage areas, such as the Wisconsin River. Each of these smaller areas can further be subdivided into smaller and smaller drainage areas. The WBD uses six different levels in this hierarchy, with the smallest averaging about 30,000 acres. The WBD is made up of polygons nested into six levels of data respectively defined by Regions, Subregions, Basins, Subbasins, Watersheds, and Subwatersheds. For additional...
    map background search result map search result map USGS 1/3 arc-second Contour Downloadable Data Collection USGS National Watershed Boundary Dataset (WBD) Downloadable Data Collection - National Geospatial Data Asset (NGDA) Watershed Boundary Dataset (WBD) USGS Land Cover - Woodland for Alabama 20160517 State or Territory Shapefile USGS Land Cover - Woodland for Mississippi 20160519 State or Territory Shapefile USGS Contours for Lethbridge E, Alberta 20121105 1 x 1 degree Shapefile USGS Contours for Lethbridge E, Alberta 20121105 1 x 1 degree Shapefile USGS Land Cover - Woodland for Mississippi 20160519 State or Territory Shapefile USGS Land Cover - Woodland for Alabama 20160517 State or Territory Shapefile USGS 1/3 arc-second Contour Downloadable Data Collection USGS National Watershed Boundary Dataset (WBD) Downloadable Data Collection - National Geospatial Data Asset (NGDA) Watershed Boundary Dataset (WBD)