[GRASS-user] Export Centroids

[gridcell]

I've already tried to shapefile.  It builds a shapefile and tries to add
linestrings.  I'm guessing its a bug in v.out.ogr.  I think I have a
temporary work around until this is fixed.  I use v.type centroid to point
and then use v.out.ogr.  Seems to work but I'm still testing.  




gridcell wrote:
> 
> Is there a way to export centroids (v.out.ogr) from a GRASS layer?
> 
> I have a layer that was originally overlapping polygons in a shapefile.  I
> imported the shapefile into GRASS and build/clean geometry, resulting in 4
> polygons.  I want to export the centroids of these polygons, and was
> hoping to have returned the polygon's attributes and a point geometry
> representing the centroid (4 features).   I tried the following but the
> command never get any results....
> 
> v.out.ogr input=blk at PERMANENT type=point,centroid 'dsn=PG: host=localhost
> user=postgres dbname=test' olayer=blk layer=1 format=PostgreSQL 
> 
> I get the following in my output...
> 
> 6 Boundary(ies) found, but not requested to be exported. Verify 'type'
> parameter.
> 
> Exporting 9 points/lines...
> 
> ERROR 1: INSERT command for new feature failed.
> ERROR:  geometry requires more points
> 
> Command: INSERT INTO "blk" (wkb_geometry , "cat", "comments") VALUES
> (GeomFromEWKT('SRID=32768;LINESTRING (1361422.480504325358197
> 586604.790284495218657)'::TEXT) , 1, 'Polygon 1')
> ERROR 1: INSERT command for new feature failed.
> ERROR:  geometry requires more points
> 
> Command: INSERT INTO "blk" (wkb_geometry , "cat", "comments") VALUES
> (GeomFromEWKT('SRID=32768;LINESTRING (1361632.899105372838676
> 586307.90450647752732)'::TEXT) , 2, 'Polygon 2')
> 
> ERROR 1: INSERT command for new feature failed.
> ERROR:  geometry requires more points
> 
> Command: INSERT INTO "blk" (wkb_geometry , "cat", "comments") VALUES
> (GeomFromEWKT('SRID=32768;LINESTRING (1361538.573653233936056
> 586446.606141098076478)'::TEXT) , 1, 'Polygon 1')
> ERROR 1: INSERT command for new feature failed.
> ERROR:  geometry requires more points
> 
> Command: INSERT INTO "blk" (wkb_geometry , "cat", "comments") VALUES
> (GeomFromEWKT('SRID=32768;LINESTRING (1361538.573653233936056
> 586446.606141098076478)'::TEXT) , 2, 'Polygon 2')
> 
> 4 features written
> 
> 
>  http://www.nabble.com/file/p19861164/blocks.png 
> 
> 

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