Andre, > Having to specify each individual contributing layer with its source > separately, while very flexible, is fairly verbose and error-prone in my > particular case. Is there a way to specify wildcards/rules for the > sources/layers to load?
No, no wildcard are possible. > If not, has such an approach been considered? Not that I'm aware of : layer unioning is a quite new feature. I guess people who have that need would use their favorite scripting language to generate the VRT. Perhaps a "ogrbuildvrt" script ala gdalbuildvrt could be done for that purpose. > > Also, is there a way to create a union layer without going through the > VRT file format? That is, through the OGR API, is there a way for a > client application to union layers that it already opened? You can use the UNION ALL keyword in a OGR SQL statement. See http://gdal.org/ogr/ogr_sql.html . Best regards, Even -- Geospatial professional services http://even.rouault.free.fr/services.html _______________________________________________ gdal-dev mailing list [email protected] http://lists.osgeo.org/mailman/listinfo/gdal-dev
