Digital Elevation Maps are high-resolution raster-based images produced by the USGS that are used to represent terrain elevations. These hypsometric maps are often 3-D rather than 2-D. This particular topographic map incorporates color to further illustrate dimensions. I am assuming that the white areas are highest in altitude while the brown/gray areas are lowest or flat.
Source
*click the link that says '10 m resolution DEM of Chittenden quad as an image file (chittenden_dem.jpg)' to see photo.
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