[GRASS-user] FW: question about merging DEMs at the edges

[Michael Barton]

> In my project, we are patching together ASTER DEM¹s. The ones generated with
> the new software from USGS are very nice. However, there remain artifacts at
> the edges. Largely due to the fact that each DEM, in UTM projection, is
> projected onto the earth¹s sphere in slightly different locales, when you
> patch them together, the edge of one doesn¹t exactly match the elevations of
> the adjacent one. In a few spot tests today, the difference is pretty small <=
> 15m in elevation. But this is still enough to cause problems in hydrologic
> modeling if your watershed happens to fall in 2 different DEM¹s (as ours
> does). 
> 
> So does anyone have a suggestion as to how we can smooth out the artificial
> scarp that occurs when we patch together a couple adjacent DEM¹s like this?
> 
> Michael
> __________________________________________
> Michael Barton, Professor of Anthropology
> School of Human Evolution & Social Change
> Center for Social Dynamics and Complexity
> Arizona State University
> 
> phone: 480-965-6213
> fax: 480-965-7671
> www: http://www.public.asu.edu/~cmbarton


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