Tuesday, May 17, 2011

Lab#6: DEMs in ArcGIS





The Geographical Coordinate System is GCS_North_American_1983. The Datum is D_North_American_1983.
Extent (in degrees)
Top: 41.273
Left: -130.998
Right: -129.344
Bottom: 41.886

These maps show the different perspectives of the original DEM model which focus on the region that is in the middle of California, nearing Northern California. To be specific, the area is of State Route 127, which is a California state highway that connects Interstate 15 to Nevada State Route 373 that passes through Death Valley National Park and curves near the Amargosa River. It begins at I-15 in Baker, which is the end of the Greater Los Angeles and the Las Vegas metropolitan areas and the start of Death Valley. The main road runs parallel to Salt Creek and Silurian Lake as it crosses the Valjean Valley, making its way along the southeastern edge of Death Valley National Park. SR 127 cuts through the mountains as it enters Inyo County then concurrently with State Route 178 through Shoshone. In the DEM Hillshade and 3-D models, areas that higher and lower in elevation are easy to pin point. On the slope map, we can see that there are many areas of high slope, because SR 127 cuts through mountain ranges. The aspect map is not a good representation of SR 127 because it does not clearly distinguish the high mountain slopes and the flat road.

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