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digital terrain model
life.sc.	digitaalinen maastomalli
life.sc., construct.	numeerinen maastomalli
English thesaurus
Digital Terrain Model
ocean., abbr.	DTM
digital terrain model
avia.	The representation of terrain surface by continuous elevation values at all intersections of a defined grid, referenced to common datum. (Digital Terrain Model (DTM) is sometimes referred to as DEM.)