[gdal-dev] Using -overwrite to create empty feature class

[Donovan Cameron]

FYI

Further testing with -overwrite given your explanation
*ogr2ogr -overwrite output.shp output.shp -progress*
...works as well but only if the files are in the same output directory

But it does report a dbf error:
*ERROR 1: fread(631) failed on DBF file.*

But I can still open the output for appending and view the results in a GIS
viewer like QGIS.

Though the -where or -fid trick works as well

On Wed, Feb 1, 2012 at 2:38 PM, Even Rouault
<even.rouault at mines-paris.org>wrote:

> Le mercredi 01 février 2012 22:22:42, Donovan Cameron a écrit :
> > Afternoon List.
> >
> > I am trying to generate an empty feature (shp or gml) from a template
> that
> > retains both the attribute-table schema and map projection.
> >
> > I can't get the *-overwrite *flag to work, it just copies the entire
> > feature (ie, makes a duplicate):
> > *ogr2ogr -overwrite -f "GML" geoname.gml /vsizip/vsicurl/
> > ${inZIP}/${inGML}* *
> > *
> > The next commands <http://gis.stackexchange.com/a/16510/1297>[1] work
> using
> > *-where *or *-fid*:
> > *ogr2ogr -f "GML" geoname.gml /vsizip/vsicurl/ ${inZIP}/${inGML} -where
> > "FID < 0"*
> > *ogr2ogr -f "GML" geoname.gml /vsizip/vsicurl/ ${inZIP}/${inGML} -fid "<
> > 0"*
> >
> > I thought the* -overwrite* flag would delete the output layer and
> recreate
> > it empty <http://www.gdal.org/ogr2ogr.html>[2]?
>
> -overwrite deletes the output layer, so that the new features added by
> ogr2ogr
> aren't added to the previously existing one, but in no way it creates an
> empty
> layer.
>
> The -where "fid < 0" trick is actually an interesting one. I've no better
> suggestion.
>
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