Hallo all!
I'm struggling with the import of a shapefile. It imports more than 300 of 1200 polygons without centroid.
Is there a way to select all these areas for getting them exclusively displayed?
Cheers
Manuel
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_______________________________________________________________________
Dr. Manuel Seeger
Wiss. Assistent Scientific Assistant
Physische Geographie Dpt. of Physical Geography
FB VI - Geographie/Geowissenschaften Geography/Geosciences
Universität Trier University of Trier
D - 54286 Trier
Tel.: +49-651-201 4557
Fax: +49-651-201 3976
Web: http://www-neu.uni-trier.de/index.php?id=9607
Dr. Manuel Seeger wrote on 10/31/2007 01:51 PM:
Hallo all!
I'm struggling with the import of a shapefile. It imports more than 300
of 1200 polygons without centroid.
First of all, check (e.g. with ogrinfo) how many polygons you
really have.
It is rather likely that you have a topologically broken SHAPE
file - in this case lots of spurious polygons will be created (since
they are present like this in the map) unless you use
- snap parameter (careful to not snap too much)
- min_area can be used to suppress small areas
or later v.clean/v.edit with approriate parameters.
Unfortunately it is rather painful to fix broken SHAPE files.
At least you have a topological GIS at hand which helps you
to identify the problems. And yes, public, official SHAPE files
are also sometimes broken (I can indicate some if you want).
Is there a way to select all these areas for getting them exclusively
displayed?
E.g., v.digit should show broken topology in red.
Markus