[GRASS-user] measuring area on a 3d polygon

[Benjamin Ducke]

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 at 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 at fastmail.fm


On Wednesday, November 16, 2011 11:01 AM, "maning sambale"
<emmanuel.sambale at 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/
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