[GRASSLIST:6183] Re: pb with topology of adjacent areas

[Radim Blazek]

On Tuesday 06 May 2003 11:38 am, betored wrote:
> dear Grass users,
>
> We have some trouble with topology on vector files imported from ARC/INFO
> polygones with v.in.arc (.ply, .pnt and .txt files).
>
> It seems that for some adjacent areas,  one of these areas (A) is
> "included" in the other (B). Consequently, the surface of A (SA) is correct
> but the surface of B is underestimated ( = SB -SA).
>
> We suspect that it is related to the fact that the first node of  A is one
> one the B nodes.

That is correct. If (A) is isle in (B), area size of (B) must be SB - SA,
i.e. without isle.


Radim