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Both are highly useful data sets for visualizing our planet for scientific and commercial landscape study.

A digital terrain model (DTM) provides a bare earth representation of terrain or surface topography. Matt Ball - “A digital elevation model (DEM) represents the elevation of Earth’s surface, including features (vegetation, buildings, etc.). The link of DTM Surface – Processes – Other Spatial Data is critical to understand.” Today, the idea is to build valuable products upon DTM, extending their usefulness, but also addressing real issues that incorporate other spatial information. They are 3D in nature and thus lend themselves to several important uses. Jeff Thurston - “Traditionally DTM have been used to build elevation models of the Earth’s surface.