[gdal-dev] OGR-Driver GML axis order handling (GDAL, QGIS)

[Jürgen Weichand]

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)?

Thanks in advance!
Juergen



Original Post @ 
http://gis.stackexchange.com/questions/43896/ogr-driver-gml-axis-order-handling-gdal-qgis