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

[Andre Joost]

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.

HTH,
André Joost