[GRASS5] v.out.ogr question
blazek at itc.it
Thu Mar 18 04:40:03 EST 2004
On Wednesday 17 March 2004 18:23, Markus Neteler wrote:
> On Fri, Mar 12, 2004 at 05:58:40PM +0100, Otto Dassau wrote:
> > Hi,
> > I used the module v.out.ogr in GRASS5.7 to export polygons but missed
> > the parameter 'type=area'. The result was a warning:
> > > WARNING: Requested types: points and lines, but (additionally) areas
> > > found. Check 'type' parameter.
> > > 3426 features written
> > > WARNING: 3426 features without category written
> > but the map was also exported with lines instead of areas. I don't
> > understand why the module explains a mistake but still exports
> > the data. Wouldn't it make more sense to simply stop after warning,
> > so the user has to add/modify the missing parameter?
> I have made a test with a map containing a single area:
> v.info ammprv | grep Number
> | Number of points: 0 Number of areas: 1 |
> | Number of lines: 0 Number of islands: 1 |
> | Number of boundaries: 1 Number of faces: 0 |
> | Number of centroids: 1 Number of kernels: 0 |
> | Number of dblinks: 1 |
> GRASS 5.7.-cvs:~/test > v.out.ogr ammprv dsn=ammprv layer=ammprv
> WARNING: Requested types: points and lines, but (additionally) areas found.
> Check 'type' parameter.
> 1 features written
> WARNING: 1 features without category written
> -> Strange: I would expect 0 features written.
Why strange? Requested type is 'line,boundary' (default) and there is 1 boundary
in ammprv and that boundary is exported.
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