A DSM is a topographic model of the earth's surface that can be manipulated using a computer. It is comprised of elevation measurements that are laid out on a grid. These measurements are derived from the return signals received by the two radar antennae on the aircraft. The signals bounce off the first surface they strike, making the DSM a representation of any object large enough to be resolved. The key feature of this product is that it provides a geometrically correct reference frame over which other data layers can be draped. For example, the DSM can be used to enhance a pilot's situational awareness, create 3D fly throughs, support location-based systems, augment simulated environments, and conduct viewshed analyses. It can also be used as a comparatively inexpensive means to ensure that cartographic products such as topographic line maps, or even road maps, have a much higher degree of accuracy than would otherwise be possible.
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