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What is the difference between a DEM and a DTM?

A digital terrain model, or DTM, may be a different type of model from a DEM, such as an irregularly spaced vector model of bare earth points. The USGS distributes Alaska elevation datasets that are labeled as DTM in the file names; however, these files are raster models with elevations at regularly spaced intervals. Therefore, the Alaska datasets labeled as DTMs are equivalent to USGS DEMs in format and surface representation.

Tags: Maps, Topographic, Data Products