Digital Elevation Model (DEM) 03 : A digital elevation model is a digital file consisting of terrain elevations for ground positions at regularly-spaced horizontal intervals
U.S. Department of the Interior, U.S. Geological Survey USGS, Landslide Hazards Program, Glossary, Washington, D.C. USA 2014. http://landslides.usgs.gov/learn/glossary.php, (ND/ Lndsld - Amer) {919}