Hi Helmut,
Thanks for the suggestion, but the area with no centroid doesn't
have a cat. I think somehow I deleted the centroid instead of the area,
and the cat went with it.
It's not really causing any problems I'm aware of; it's just odd.
Thanks, Dave
On 11/27/16 13:24, Helmut Kudrnovsky wrote:
Dave Roberts wrote
After editing a map with wxgui I ended up with 39 areas and 38
centroids. How do I find and delete the area with no centroid?
I have tried many combinations of v.info, v.category, v.to.db, and
visualizing with d.vect. If I use v.clean tool=rmarea with slowly
increasing thresholds it gets rid of an area I want before it finds the
one I don't so I don't think it's a sliver.
GRASS GIS 7.3.svn > v.info demo
. . .
Number of points: 0 Number of centroids: 38
Number of lines: 0 Number of boundaries: 112
Number of areas: 39 Number of islands: 19
. . .
GRASS GIS 7.3.svn > v.category demo op=report
Layer/table: 1/demo
type count min max
point 0 0 0
line 0 0 0
boundary 0 0 0
centroid 38 1 75
area 0 0 0
face 0 0 0
kernel 0 0 0
all 38 1 75
Thanks, Dave
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d. vect has following option :
cat: Display category numbers of features
try to display the cat info for the polygones to check where the centroid is
missing.
have then a look at v.extract and extract only these polygones you need.
HTH
-----
best regards
Helmut
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