Published By U.S. Geological Survey, Department of the Interior
Issued over 9 years ago
Summary
Description
The USGS Contours service from The National Map (TNM) consists of contours generated for the conterminous United States from the 1 arc-second National Elevation Dataset (NED). Contours are displayed between 1:289K and 1:72K scales in The National Map viewer. Contour intervals are 100-feet at 1:289K and 1:144K, and 50-feet at 1:72K. The National Map viewer allows free downloads of public domain contour data in either Esri File Geodatabase or Shapefile formats. The NED serves as the elevation layer of The National Map, and provides basic elevation information for earth science studies and mapping applications. Scientists and resource managers use NED data for global change research, hydrologic modeling, resource monitoring, mapping and visualization, and many other applications. For additional information on the NED, go to http://ned.usgs.gov.