[!! SPAM] [GRASS-user] digitisation of an adjacent polygon

[Maciej Sieczka]

Vincent BAIN wrote:
> No, Grass is a topological GIS, that is adjacent polygons share a
> single common boundary...

That's right.

> You can digize a layer of boundaries, then
> create the polygon topology with v.build.

Correction: you don't need to run v.build. Once you exit v.digit the
topology is built automatically. To create a polygon digitize it's
boundaries, make sure their nodes are snapped, digitize centroid within
each polygon. In GRASS, a polygon is made of boundaries and a centroid
inside.

Maciek