LongValley Caldera Digital Elevation Data (DEM)



DEM data format

 Digital Elevation Model

Digital Elevation Models (DEMs) consist of a raster grid of regularly spaced elevation values that have been primarily derived from the USGS topographic map series.  Elevation data on this CD-ROM are from theUSGS National Elevation Dataset (NED).  The NED is a seamless raster dataset developed by merging the highest-resolution, best-quality 1:24,000-scale Digital Elevation Model (DEM) data available across the United States.  From this DEM, a shaded relief model was created and is available in the DEM folder as well.

dem usa

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