[GRASS-dev] v.category option=print: fails to print
tutey at o2.pl
Sun Nov 26 14:16:39 EST 2006
Michael Barton wrote:
> Why list area and centroid separately?
Because you can have "broken areas" - there is a centroid inside, but
the boundary is not closed (eg. after importing a non-topological
shapefile; or due to an error during digitizing). Listing areas and
centroids separately can help you debug the issue.
> The second would be even better (IMHO) if adding cats to lines included the
> lines bordering and defining areas. If boundaries can be conceptually
> differentiated from lines
If they were not, any closed line without a centroid would be an
invalid area according to GRASS topological model. The boundaries type
enables to distinguish the closed lines from incomplete areas (closed
boundaries missing the centroid).
>, then the first might be preferable, but I'm still
> not sure.
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