to my mind, one has to be cautious with this module, and be aware of how surfaces are estimated. It appears that results show a big variability given the current region resolution. (just try r.surf.area on a sloppy plane [generated with r.plane], knowing its inclination and thus its actual surface in advance)
Bye, Vincent Le mardi 16 septembre 2008 à 02:28 -0700, Alex Mandel a écrit : > Alex Mandel wrote: > > Maciej Tomaszczyk wrote: > >> hello > >> I have DEM of some part of mountains chain and i would like to calculate a > >> real area of this (area in 3d not plane area). > >> I wonder if Grass can do it. > >> best > >> maciej > >> > >> Maciej Tomaszczyk > >> Polish Geological Institute > >> Geological Mapping Department > >> http://www.pgi.gov.pl > >> http://www.opengeology.pl > >> > >> > >> > > > > Just to clarify, you mean surface area as opposed to footprint of the > > mountain range. So the sum of all the surfaces of the 3d model? > > > > Alex > > > > > > The solution to that problem would be r.surf.area which should give you > both the 2D and 3D area. > You'll have to actually try this as I just read about it in Markus and > Helena's book. > > Alex > _______________________________________________ > grass-user mailing list > [email protected] > http://lists.osgeo.org/mailman/listinfo/grass-user > _______________________________________________ grass-user mailing list [email protected] http://lists.osgeo.org/mailman/listinfo/grass-user
