[Qgis-developer] Difference for transform reference system between QGIS and GDAL

Andre Joost andre+joost at nurfuerspam.de
Thu Jan 16 21:16:39 PST 2014

Am 17.01.2014 03:01, schrieb Luiz Motta:
> Hi all,
> I had differences for transform the reference system of geometries between
> GDAL and QGIS.
> I made the transform using GDAL into geometry with reference system  SAD 69
> UTM (EPSG 29191) to WGS 84 (EPSG 4326) .
> When i add in QGIS the geometries with WGS84 and SAD 69  using 'on the fly'
> (WGS84), has diferences positions of coordinate (see picture).
> The QGIS reads the reference system of shapefile different than GDAL (see
> layer property).
> I would like understand how using GDAL for transform geometries this
> reference system of this shapefile ?
> How can difference reading shapefile by QGIS and GDAL ?

The shapefiles .prj file has no +towgs84 parameters, so GDAL sets them 
to zero.

QGIS assigns the EPSG:29191 to the file, which has +towgs84 parameters.

André Joost

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