Digital elevation models contain finely gridded elevation values and can be derived from sources such as satellite data or ...

A digital map of the elevation of an area on the earth. The data are either collected by a private party or purchased from an organization such as the U.S. Geological Survey (USGS) that has ...

He made good on that promise this week with the release of the first set of maps, called Arctic digital elevation models or ArcticDEMs, created through the National Science Foundation and National ...