";s:4:"text";s:2969:"The digital elevation model itself consists of a matrix of numbers, but the data from a DEM is often rendered in visual form to make it understandable to humans.
In these oblique visualizations, elevations are sometimes scaled using "Mappers may prepare digital elevation models in a number of ways, but they frequently use One powerful technique for generating digital elevation models is The HRS instrument on SPOT 5 has acquired over 100 million square kilometers of stereo pairs. This visualization may be in the form of a contoured Visualizations are sometime also done as oblique views, reconstructing a synthetic visual image of the terrain as it would appear looking down at an angle. In gravimetry e.g., the primary grid may be 50 m, but is switched to 100 or 500 meters in distances of about 5 or 10 kilometers. The most common grid (raster) spacing is between 50 and 500 meters. Heidelberg.Adrian W. Graham, Nicholas C. Kirkman, Peter M. Paul (2007):