For these reasons, a DTM represents the earth’s true surface, regardless of all of these objects and their changing natures. Skyscraper’s are built, and even false covering can obscure the land beneath. Houses come and go, bridges come and go and trees just grow and die. The obvious question is, why use a DTM instead in the first place? So let’s start there. For all intents and purposes a DTM represents the earth’s land surface. The processing involved to turn a DEM into a DTM means added cost to a project. It is possible to process DEM, so they are DTM. Alternatively, a DEM represents a surface where objects are included in the surface measurement. With each technological advancement, the digital elevation models have improved in accuracy, resulting in a much more useful model of the Earth.”Ī digital terrain model (DTM) is different than a digital elevation model (DEM), the first representating a continuous surface as if all the objects are removed – a bare surface. 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.
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