I've got a grass vector map containing some areas with holes. It's a
polygon of a river containing some islands; it looks nice in grass,
centroids with cat in the wet parts, no centroids in the islands.
There is no DB table.
after exporting with 'v.out.ogr type=area' to a shapefile, when I load
the shp file into QGIS 0.8.1 I see that all the holes have been filled in.
The boundaries are still intact. using qgis's editing tools I can cut
them out, but it takes a bit of manual labour to fix them all.
I've got a grass vector map containing some areas with holes. It's a
polygon of a river containing some islands; it looks nice in grass,
centroids with cat in the wet parts, no centroids in the islands.
There is no DB table.
after exporting with 'v.out.ogr type=area' to a shapefile, when I load
the shp file into QGIS 0.8.1 I see that all the holes have been filled in.
The boundaries are still intact. using qgis's editing tools I can cut
them out, but it takes a bit of manual labour to fix them all.
what am I doing wrong?
Maybe use v.out.ogr -c?
I did a quick test and got the same result like you, islands within rivers are filled without -c. Exporting only features with a category fixed it for me, holes stay holes and are not filled.
I noticed that layer 0 had the filled holes while layer 1 was the good polygons. v.clean seemed to merge those two layers. With Markus M's fix, I solved my problem. Which reminds me...should I close this ticket since it works for me?
Bob
Bob Moskovitz
Research Analyst I
Seismic Hazard Evaluation Project
California Geological Survey http://gmw.consrv.ca.gov/shmp
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-----Original Message-----
From: grass-user-bounces@lists.osgeo.org
[mailto:grass-user-bounces@lists.osgeo.org]On Behalf Of Hamish
Sent: Thursday, April 09, 2009 12:02 AM
To: grass list
Subject: [GRASS-user] exporting areas to shapefiles without filling
holes
Hi,
I've got a grass vector map containing some areas with holes. It's a
polygon of a river containing some islands; it looks nice in grass,
centroids with cat in the wet parts, no centroids in the islands.
There is no DB table.
after exporting with 'v.out.ogr type=area' to a shapefile, when I load
the shp file into QGIS 0.8.1 I see that all the holes have
been filled in.
The boundaries are still intact. using qgis's editing tools I can cut
them out, but it takes a bit of manual labour to fix them all.
