Wednesday, November 9, 2011

Week 7 - DEMs in ArcGIS

Working with digital elevation models (DEMs)

The area I selected from the USGS Seamless Data Warehouse shows the south western coast of the United States, south of San Luis Obespo and north of Santa Barbara.  The models show the coastline met by the ocean along the left border of the map (shaded in grey on the aspect model and also very identifiable on the shaded relief model), flatland near the coast (particularly in the north western corner of the maps that could possibly be a lake), several main valleys, and progressive increases in altitude heading east (perhaps showing the south end of the Sierra Nevada Mountains).  The extent of these maps is included in the borders of -120.65444 on the left, 35.03667 on the top, -119.88028 on the right, and 34.61139 on the bottom.  The geographic coordinate system for these digital elevation models is: GCS North American 1983.  The following models work to provide viewers of an in depth look at the topography of the region, which include a shaded relief map, a slope map, an aspect map and a 3D model.



3D Model

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