[Qgis-user] QGIS/GDAL GML flipped coordinate order with URN/URI srsName

[Ilkka Rinne]

Ok, thanks for the quick answer and bug fix!

Any idea about the planned version of QGIS that would include GDAL 2.1.2?


Ilkka

On Tue, Oct 11, 2016 at 12:59 PM, Even Rouault <even.rouault at spatialys.com>
wrote:

> Le mardi 11 octobre 2016 10:47:09, Ilkka Rinne a écrit :
> > Hi,
> >
> > We are experiencing an unwanted flipping of coordinate order
> interpretation
> > when adding GML 3.2 files as new vector layers in QGIS 2.2 Valmiera.
> >
> > The GML data is has been encoded as a wfs:featureCollection with EU
> INSPIRE
> > ProtectedSite 4.0 features as collection members (XML Schema:
> > http://inspire.ec.europa.eu/schemas/ps/4.0/ProtectedSites.xsd). When
> using
> > the URI-type srsName "http://www.opengis.net/def/crs/EPSG/0/3035" the
> > coordinates seem to be interpreted (by GDAL?) in order (easting,
> northing),
> > while the official axis order (according to the EPSG-registry) is
> > (northing, easting). If we change the srsName to the URN-type format
> > "urn:ogc:def:crs:EPSG::3035" in the GML file, the import seems to use the
> > correct coordinate order.
> >
> > To comply with the INSPIRE requirements, we have to use the URI format
> > srsNames, but this is likely to cause a lot of confusion for the QGIS &
> > GDAL users of the data if the coordinates are interpreted in the wrong
> > order.
> >
> > I'm fully aware of the massively confusing lat/lon (x/y) coordinate order
> > interpretation misalignment between the geographers and the (GIS)
> software
> > implementors, but was not aware that this issues also shows it's ugly
> head
> > for other CRSes than CRS 84/EPSG:4326.
>
> It's a mess indeed, reinforced by constant changes in srsName syntaxes.
>
> >
> > Question 1: Is this an intentional feature or a bug?
>
> This was a bug. I've just fixed it per https://trac.osgeo.org/gdal/
> ticket/6678
> (in time for the upcoming GDAL 2.1.2)
>
> >
> > Question 2: Is it possible to force GDAL from the QGIS UI to interpret
> the
> > coordinate order of these GML files in the official order?
>
> No workaround I can think of, apart the manual replacing as you did.
>
> Even
>
> --
> Spatialys - Geospatial professional services
> http://www.spatialys.com
>



-- 
Ilkka Rinne
Founder, Head of Customer Experience and Interoperability, Spatineo Oy
Email: ilkka.rinne at spatineo.com
Skype: ilkka.o.rinne, phone: +358 50 523 8974
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