Le jeudi 13 décembre 2012 20:35:36, Jürgen Weichand a écrit : > Hello List, > > By default the OGR-Driver will swap the axis order to longitude, > latitude for geographic coordinate systems. > > "Since OGR 1.8.0, the GML driver has coordinate system support. This is > only reported when all the geometries of a layer have a srsName > attribute, whose value is the same for all geometries. For srsName such > as "urn:ogc:def:crs:EPSG:", for geographic coordinate systems (as > returned by WFS 1.1.0 for example), the axis order should be (latitude, > longitude) as required by the standards, but this is unusual and can > cause issues with applications unaware of axis order. So by default, the > driver will swap the coordinates so that they are in the (longitude, > latitude) order and report a SRS without axis order specified." > http://www.gdal.org/ogr/drv_gml.html > > > Example (1): urn:ogc:def:crs:EPSG::4326 - GML 3.2 (WGS 84) > Lat / Lon is swapped to Lon / Lat by the driver (result: correct import > into QGIS). > http://www.weichand.de/tmp/wfs20gml32_epsg4326.gml > > Example (2): urn:ogc:def:crs:EPSG::31468 - GML 3.2 (Gauß Krüger 12°) > North / East is NOT swapped to East / North (result: incorrect import > into QGIS). > http://www.weichand.de/tmp/wfs20gml32_epsg31468.gml > > Example (3): urn:ogc:def:crs:EPSG::25832 - GML 3.2 (ETRS89 UTM 32N) > Default: East / North (result: correct import into QGIS). > http://www.weichand.de/tmp/wfs20gml32_epsg25832.gml > > > Is there any reason why OGR 1.9.2 don’t swap the coordinates of > projected systems (to East / North)?
Yes, the reason is that it is not implemented... There's a patch in http://trac.osgeo.org/gdal/ticket/4329 that should address this, but I'm not sure if this still applies cleanly to trunk, because it has perhaps rotten a bit. I didn't apply since I was midly satisfied with the duplication of symbols. The ideal would be to have a single function that would address both oSRS.EPSGTreatsAsLatLong() and oSRS.EPSGTreatsAsNorthingEasting() to avoid testing them in each area of the code that want to mess with axis ordering. > > Thanks in advance! > Juergen > > > > Original Post @ > http://gis.stackexchange.com/questions/43896/ogr-driver-gml-axis-order-hand > ling-gdal-qgis _______________________________________________ > gdal-dev mailing list > [email protected] > http://lists.osgeo.org/mailman/listinfo/gdal-dev _______________________________________________ gdal-dev mailing list [email protected] http://lists.osgeo.org/mailman/listinfo/gdal-dev
