[gdal-dev] [WFS Drvier] "Id Only" and "Geometry Only"

[Paolo Corti]

On Fri, Mar 16, 2012 at 3:30 PM, xavier lhomme <lhomme.xavier at gmail.com> wrote:
> Hello
>  I want to selectFeatures from a WFS DataSource.
> Is it possible to return Geometry Only without the attribut ?
>  And Is it possible to return only Id (without Geometry and Attribut ) ?
>

If using ogrinfo, you can set the -geom and -fields parameters, as well
documented here [1], for example this will retrieve geometries, but
not other fields:

ogrinfo -ro WFS:"http://myserver/ows" mylayer -geom=YES -fields=NO

Or, append the PROPERTYNAME GetFeatureInfo's parameter in query
string, for example:

ogrinfo -ro WFS:"http://myserver/ows?PROPERTYNAME=field1,field2" mylayer

Programmatically, I do not see a way with the API to set this field
filters (but I may be wrong), but you could still define a virtual
layer, choosing the needed fields you want to select, and then
access the layer using the VRT driver.
For example:

<OGRVRTDataSource>
    <OGRVRTLayer name="mylayer">
        <SrcDataSource>WFS:http://myserver/ows</SrcDataSource>
        <SrcLayer>mylayer</SrcLayer>
        <Field name="field1" src="field1" />
        <Field name="field1" src="field1" />
    </OGRVRTLayer>
</OGRVRTDataSource>

best regards
P

[1] http://www.gdal.org/ogrinfo.html

-- 
Paolo Corti
Geospatial software developer
web: http://www.paolocorti.net
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