Folks, I have done a bit of work around OGR recently to make it easier to manage schemas for layers as VRT files. For a project I wanted to be able to have a VRT file which would define a set of layers with geometry types, coordinate systems, fields and related information that I could use with ogr2ogr or similar utilities to create all the layers.
To that end I have: o Extended the VRT driver to support <Field> definitions giving all the details of an attribute field on a layer (type, width, name, precision and the source field it comes from in the source layer). o Written an ogr2vrt.py script that will create a VRT corresponding to a source datasource. This is the ogr equivelent to what we could do with gdal_translate -of VRT in.tif out.vrt but for feature datasources. The script currently lives in gdal/swig/python/samples but I may promote it to the scripts directory implying it is supported if it is deemed to be useful. o Modified the VRT driver so that if the datasource name is @dummy@ it will not go looking for an external file - it just creates a dummy memory datasource and layer. This effectively turns the .vrt into a schema definition since there will be no effort to go looking for features on the layers. The -schema switch to ogr2vrt.py will create a VRT setup this way. Let me know if there are any questions or interest in this capability. Best regards, -- ---------------------------------------+-------------------------------------- I set the clouds in motion - turn up | Frank Warmerdam, warmer...@pobox.com light and sound - activate the windows | http://pobox.com/~warmerdam and watch the world go round - Rush | Geospatial Programmer for Rent _______________________________________________ gdal-dev mailing list gdal-dev@lists.osgeo.org http://lists.osgeo.org/mailman/listinfo/gdal-dev
