I think Michael's reply (see below) to my message is
actually the answer to your question 
Ben
On Wednesday, November 16, 2011 10:13 AM, "Michael Barton"
<michael.barton@asu.edu> wrote:
r.surf.area
will calculate a topographically corrected area for rasters. So if you
convert your vector areas to raster, this will do the trick.
Michael
______________________________
C. Michael Barton
Director, Center for Social Dynamics & Complexity
Professor of Anthropology, School of Human Evolution & Social Change
Arizona State University
Tempe, AZ 85287-2402
USA
voice: 480-965-6262 (SHESC), 480-727-9746 (CSDC)
fax: 480-965-7671(SHESC), 480-727-0709 (CSDC)
www: http://csdc.asu.edu, http://shesc.asu.edu
http://www.public.asu.edu/~cmbarton
--
Benjamin Ducke
{*} Geospatial Consultant
{*} GIS Developer
benducke@fastmail.fm
On Wednesday, November 16, 2011 11:01 AM, "maning sambale"
<emmanuel.sambale@gmail.com> wrote:
Hi,
I have a series polygons located in a mountainous terrain. I can
convert the 2d vector into 2.5d using v.drape and a DEM, however, it
only converts 2D vector point or line data and not areas. My task is
to calculate the area in hectares of the polygon incorporating the
elevation/surface of the polygon. I then need to subdivide the main
polygon into smaller polygons using a preferred area in hectares.
How to calculate 2.5d polygon areas in grass?
--
cheers,
maning
------------------------------------------------------
"Freedom is still the most radical idea of all" -N.Branden
wiki: http://esambale.wikispaces.com/
blog: http://epsg4253.wordpress.com/
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