The elevation value are stored as a matrix of regularly spaced ground positions Each data point represents the elevation of the grid cell in which it is located . 1. Digital Elevation Models (DEM). 1. DEM 1:24,000 . 1:24,000 DEM http://edc.usgs.gov/guides/images/dem/utm.gif- Produced and distributed by USGS - regular grids in UTM coordinates system - 7.5 minute quadrangle coverage - 30 meter by 30 meter resolution - elevation unit is meter - profiles do not always hav31501
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