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  1. [data models] Acronym for digital elevation model. The representation of continuous elevation values over a topographic surface by a regular array of z-values, referenced to a common vertical datum. DEMs are typically used to represent the bare-earth terrain, void of vegetation and manmade features. Media\digital-elevation-model.gif
  2. [data models] A format for elevation data, tiled by map sheet, produced by the National Mapping Division of the USGS.

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