[Qgis-developer] Georeferencing using PyQGIS
jlayt at kde.org
Sun Oct 11 14:14:23 PDT 2015
On 11 October 2015 at 21:03, Chris Schaffer <schaffecj at gmail.com> wrote:
> I would like to georeference a raster using PyQGIS. If I want to
> georeference a raster manually (loaded from an ascii file), I can use the
> Georeferencer plugin, but I don't see a way to access this core C++ plugin
> using PyQGIS.
> When I tried using GDAL to georeference a raster, using the script created
> by selecting "Generate GDAL Script" in the Georeferencer, the raster was
> incorrectly georeferenced when I loaded it in QGIS. It looks like there may
> be differences between how GDAL and QGIS handle the georeferencing offsets.
> Do you have any advice for georeferencing a raster using PyQGIS, using the
> Georeferencer or otherwise? I'm using QGIS 2.4.
You can't access the georeferencer from pyQGIS as it is a plugin
itself. You can find the plugin code at . I would like to see it
all tidied up and exposed as public api, especially seeing as the
Helmert 2-point transform is not available in GDAL but is only
implemented in QGIS itself.
I did write my own georeferencer for our specialised purposes 
seeing as the QGIS gui is rather poor (45 clicks to 3-point georef
versus 5 in mine). There are Python bindings to gdal that you could
use instead , but I found it just easier to call the binaries
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