Since 1989, the USGS EROS Data Center has been mapping the vegetation condition of the conterminous United States (lower 48 states) using satellite information. The vegetation condition maps, or more ...
This is a prototype land-cover database for the conterminous
United States designed for use in a variety of global modeling,
monitoring, mapping and analytical endeavors has been created. ...
The reference layer is for the Shuttle Radar Topography Mission (SRTM)
elevation 1 arc second (30 meter) dataset. SRTM aboard the Space Shuttle
Endeavour, launched on Feb. 11, 2000, used the same ...