A DEM, or Digital Elevation Model, is just that – a digital model –
created from the terrain elevation data in the chosen area. This map uses a DEM to show a close-up
of the features in the “project area” of Sacramento Valley, California. The colors make the differences in
elevation very clear – orange and red (Coast Ranges and the Sierra Nevada) mean
higher elevation, while blue (Sacramento Valley) indicate lower elevation. This kind of map is especially useful
to developers, because it allows them to see the elevation differences in a
given area at a glance, which (in California’s case) is important for
development because of such natural hazards, such as flooding, landslides and wildfires.
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