[gdal-dev] Unions shapefiles using ogr

[Paul Meems]

Hi all,

How can I union several shapefiles into one using ogr?
I tried using the OGR Virtual Format and created a XML file similar to this:

<OGRVRTDataSource>
    <OGRVRTUnionLayer name="unionLayer">
        <OGRVRTLayer name="source1">
            <SrcDataSource>source1.shp</SrcDataSource>
        </OGRVRTLayer>
        <OGRVRTLayer name="source2">
            <SrcDataSource>source2.shp</SrcDataSource>
        </OGRVRTLayer>
    </OGRVRTUnionLayer>
</OGRVRTDataSource>

My next step was to call ogr2ogr to created the new file.
The above XML merges all shapes instead of performing an union.
How can I do a proper union using ogr?

Thanks,

Paul
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