[GRASS-user] how to calculate areas

[Alex Mandel]

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