surface area

GRASS GRASS user
1

Hi GRASS community,

is it possible to calculate the surface area of a 3d (not 2d!!) surface (DEM)?

Thanks in advance
                Frank

       Frank Lederer
       Sandweg 64
       60316 Frankfurt/Main
       Germany

    Lederer@em.uni-frankfurt.de
    phone: ++49-069-4960545

2

First, calculate the surface areas of individual cells using a slope map,
then generate a sum of the cell values, using r.stats and a spreadsheet.
Good Luck
Angus.

On Tue, 20 Jan 1998, Frank Lederer wrote:

Hi GRASS community,

is it possible to calculate the surface area of a 3d (not 2d!!) surface (DEM)?

Thanks in advance
                Frank

       Frank Lederer
       Sandweg 64
       60316 Frankfurt/Main
       Germany

    Lederer@em.uni-frankfurt.de
    phone: ++49-069-4960545

3

On Wed, 21 Jan 1998, Angus Carr wrote:

First, calculate the surface areas of individual cells using a slope map,
then generate a sum of the cell values, using r.stats and a spreadsheet.

                                                  ^^^^^^^^^^^^^^^^^^
r.stats -1z input=surface_area_map | awk '{ areasum+=$1 } END{ print
areasum}'

will save you from having to export to a spreadsheet.
  -Malcolm

Good Luck
Angus.

On Tue, 20 Jan 1998, Frank Lederer wrote:

> Hi GRASS community,
>
> is it possible to calculate the surface area of a 3d (not 2d!!) surface (DEM)?
>
> Thanks in advance
> Frank
>
>
>
> Frank Lederer
> Sandweg 64
> 60316 Frankfurt/Main
> Germany
>
>
> Lederer@em.uni-frankfurt.de
> phone: ++49-069-4960545
>
>