Hi, This is something I discussed with Paolo during the past Code Sprint. In the original EPSG databases, there is an area of applicability defined as a bounding box in latitude,longitude for each spatial reference system. In the import process of the EPSG database used for libgeotiff, GDAL, proj.4 and PostGIS ( detailed in http://svn.osgeo.org/metacrs/geotiff/trunk/libgeotiff/csv/README ), that area of applicability is not currently imported in the .csv files concerning geographic or projected SRS (but they are imported for datum shift transforms).
A potential improvement would be to add it and expose it in the GDAL OGRSpatialReference object, so that QGIS could benefit from it. This could be used for example : - to warn the user when reprojection to a SRS is completely or partially out of its area of applicability - to filter the SRS catalog to offer only the relevant SRS at a point or on a zone - ... Even -- Geospatial professional services http://even.rouault.free.fr/services.html _______________________________________________ Qgis-developer mailing list [email protected] http://lists.osgeo.org/mailman/listinfo/qgis-developer
