[GRASS-user] Closed Areas

[Markus Metz]

pipppoo wrote:
>
[...]
> Number of duplicate centroids: 116
> Number of areas without centroid: 116

That looks like there are overlapping areas. For these, a centroid can
not be unambiguously assigned.

> v.category complete. 597 features modified.
>
> The output says that to 116 areas a centroid can't be added.
> Thus i controlled with v.digit, if the boundaries are closed:
> http://osgeo-org.1803224.n2.nabble.com/file/n5783822/Screenshot-v.digit_-_FNF%40PERMANENT.png
>
> How you can see, there are just green crosses, that means that every
> boundary should be closed? Or not?
> But why then there are 116 areas without centroid after runnig v.centroids?
>
Because there are also 116 duplicate area centroids. The total number
of centroids is identical to the total number of areas.

You would have to clean the area vector without centroids first with
the tools break,rmdupl, maybe also with rmsa: repeat
tool=break,rmdupl,rmsa until rmsa does no more modifications.

Markus M

> Thanks for any help in advance!
>
> cheers,
> pipppoo
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