ConserveOnline - Terrain Analysis (DEMs and SAR), by Rick Guritz

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Terrain Analysis (DEMs and SAR), by Rick Guritz

By Web Admin on 6/5/2007 | Keyword(s): Session iii: statewide spatial datasets

High quality digital elevation models are a critical foundation layer to any modeling effort that utilizes remote sensing data, especially when it includes hydrology and watershed analysis. U.S. Geological Survey (USGS) maps of Alaska are over 40 year’s old, do not meet national Map Accuracy Standards, and there is no existing or planned program to replace them. The most recent statewide high resolution imagery available is 25 years old and does not reflect the current Alaska landscape. This imagery was acquired through the Alaska High Altitude Aerial Photography Program and is not in digital form, a prerequisite for modern technology. It should also be noted that the present funding situations in federal and state agencies have not allowed Alaska to be a participant in the National Aerial Photography Program and the National Digital Orthophoto Program. These programs provide complete aerial photography and orthoimagery coverage for the lower forty-eight states on a regular basis.

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