Ok, now can I add the missing categories in dbf table with:
v.to.db map='polygons' type='centroid' option='cat'
But the update command is still failing:
v.db.update map=polygons col=building value=3.0
The new categories in dbf table have still empty 'building' attributes...
On Wed, 03 Dec 2014 09:42:28 +0100, tommaso <[email protected]>
wrote:
Hello, I'm trying to polygonize a lines layers. I imported the layer in
grass with v.in.ogr as boundaries, then I attached the centroids with
v.centroid.
Probably because of the polygonize, some attribute are lost in in the
output map, so I have to update the table to fix the attributes:
v.db.update input='polygons' col=building, value='3.0'
After the update, the table look fine with v.db.select: all record have
the right value. But if I export the layer with ogr, some records do not
have attributes at all. My export command looks so.
v.out.ogr format='PostgreSQL' input='polygons' type='area'
dsn='PG:dbname=test_project host=localhost' olayer='test_table'
This warning is raise by v.to.ogr: WARNING: 8 features without
attributes were written
I guess, the map categories are not synchronized with the database.
v.categories returns 1018 results, while the map contains only 298
records:
v.category polygons option=print | wc
1018 1018 5133
Where are so many categories coming from? How can I synchronize map and
database?
Thanks, Tomm
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