[GRASS-user] Determine surface areas

[Markus Metz]

Nikolaus Arnold wrote:
> Finally got it.
>
> Import map:
> v.in.dxf
>
> created areas:
> v.type input=map1 output=map2 type=line,boundary
> v.clean input=map2 output=map3 tool=snap thresh=0.0001
> v.centroids input=map3 output=map4 option=add
>
> checked with v.digit (strangely v.centroids always categorized in the 
> same
> way, but in the outer ring it mixed up two areas, but that was easily
> corrected by manually changing those two categories)
would
v.centroids input=map3 output=map4 option=add cat=<cat_max_val + 1>
help?