[data models]
Also known by the acronym DEM. A general term referencing modeled elevation values over a topographic surface, whether a gridded raster or an irregular TIN. DEMs can refer to bare earth or a top surface that includes trees and buildings.
[data models]
A raster dataset produced from a sample of elevations or depths taken on a regular grid, typically used to represent the bare-earth terrain, void of vegetation and human-made features; sometimes confused with digital terrain model or digital surface model.
[data models]
A format for elevation data, tiled by map sheet, produced by the National Mapping Division of the USGS.
