• The SRTM Digital Elevation Model produced by NASA and the USGS was used for elevation analysis.

  • The PRISM Climate Group provides national gridded climate data that is based on climate monitoring networks. Monthly temperature and precipitation climate normals for the 1971 to 2000 time period were used... READ MORE »

  • The USDA Forest Service and the National Atlas of the United States® have collaborated to create, and deliver a data set that shows ecoregions, which are ecosystems of regional extent, in the United States... READ MORE »