Tuesday, May 22, 2012

Lab #6: DEMS in ArcGIS

The maps below visualize the Bay Area Peninsula, where I grew up. San Francisco is the sparkling, urban 7x7 mile area at the tip of peninsula. When people from the bay area say they live on "the peninsula," they typically mean one of the cities south of San Francisco. So as you will see in the maps below, the top of the peninsula is not included. Instead, the main thing you see is the hills of Golden Gate National Recreation Center (blue, in the first map below). The fog rolls over these hills from the west into the reservoir (brown), which is just east, nearly on the San Andreas Fault Line. East of the reservoir is Highway 280 (not shown), which runs north and south along the peninsula separating the beautiful landscape from the residential areas. Many of these areas are on much flatter ground, which is why the rightmost portion of the map directly below looks like there might be ocean where there is really flat land. Around all of this land, of course, is the San Francisco Bay (east) and the Pacific Ocean (west).

With the exception of the 3D model, which is tilted slightly to the right to give you a better view of the interesting landscape features, each map is oriented with north at the top. For reference, the geographic coordinate system for these maps is GCS North American 1983, and the extent information is as follows: Top: 37.71 degrees;  Bottom: 37.34 degrees; Left: -122.62 degrees; Right: -122.62 degrees.




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