Maps and GIS
A topographical map is the main type of map used to depict elevation, often through use of contour lines. In a Geographic Information System (GIS), digital elevation models (DEM) are commonly used to represent the surface (topography) of a place, through a raster (grid) dataset of elevations. Digital terrain models are another way to represent terrain in GIS.
To determine elevation of a place, it must be surveyed, in reference to a ground control point.
Read more about this topic: Elevation
Famous quotes containing the word maps:
“The faces of most American women over thirty are relief maps of petulant and bewildered unhappiness.”
—F. Scott Fitzgerald (1896–1940)