[GRASS-dev] Building a vector topology (and failing)
landa.martin at gmail.com
Mon Mar 12 13:45:01 EDT 2012
2012/3/12 Seth Price <seth at pricepages.org>:
> Hey all, I've been trying to get my topology to build for a while now in my
> module, and I'm not getting anywhere. I currently have it to the point where
> I'm simply trying to draw a triangle with corners (0,0), (0,100), & (100,0).
> It calls Vect_append_point() three times,
a valid area is defined by a closed boundary or by (closed) chain of
boundaries. In this case simply add the last point at 0,0.
> then Vect_write_line(,GV_BOUNDARY,,) to create the polygon. When building
> the topology, it fails to create an area with "WARNING: Number of incorrect
> boundaries: 1".
yes, there is one boundary which cannot form an area (it's not closed).
Martin Landa <landa.martin gmail.com> * http://geo.fsv.cvut.cz/~landa
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