digital elevation model definition
digital elevation model means the representation of terrain surface by continuous elevation values at all intersections of a defined grid, referenced to common datum;
digital elevation model. (DEM) means Digital Surface Model (DSM) or Digital Terrain Model (DTM).
digital elevation model. (“DEM”) means a general definition for a file containing ground elevation data. This may be a digital elevation model, a digital terrain model, or a reflective surface model and is meant to encompass all means of production, including LIDAR and stereo pairs.