Digital Elevation Model : A model of terrain relief in the form of a MATRIX Easch element of the DEM is regared as a node of an imaginary grid The gird is defined by identifying one of its corner (lower left usually), the distance between nodes in both the X and Y directions, the number of nodes in both the X and Y directions and the gird orientation
digital elevation model - This term is used very generally to describe a great variety of terrain files and file formats There are also a number of mutually incompatible file formats that use the dem file name extension
Digital Elevation Model data DEMs are continuous raster layers in which data file values represent elevation DEMs are available from the USGS at 1: 24,000 and 1: 250,000 scale, can be produced with terrain analysis programs, and IMAGINE OrthoMAX
DEM means "Digital Elevation Model" It is a "grid" of points (usually on an even spacing) that contains both horizontal and vertical data about the earth's surface DEMs are commonly used for the creation of "ortho" photos A sketch of a DEM is shown below
Digital Elevation Model A digital representation of a continuous variable over a two-dimensional surface by a regular array of z values referenced to a common datum Digital elevation models are typically used to represent terrain relief The format of the USGS digital elevation data sets