[GRASS-user] [GRASSLIST:1159] Surface area of a DEM

[Jonathan Greenberg]

I'd like to estimate the surface area of each cell in a DEM (r.surf.area
seems to just give you the value for the entire dem, no?) -- by surface area
I am referring to the "true" ground area as opposed to the planar projected
ground area (which is constant for all cells) -- flat areas the area = the
planar projected area (e.g. a 30m cell that is flat has 900m2 of surface
area, but an inclined slope will have > 900m2).  Is there a grass module to
do this, or any recommendation on how to calculate this?  Thanks!

--j

--

Jonathan A. Greenberg, PhD
NRC Research Associate
NASA Ames Research Center
MS 242-4
Moffett Field, CA 94035-1000
Phone: 415-794-5043
AIM: jgrn3007
MSN: jgrn3007 at hotmail.com