I'm trying to write a processing script using grass
r.neighbors algorithm for rasters. When you use the Gui for this algorithm, you can leave the GRASS layer extent field blanc to use the minimal extent. On the contrary, when used in the python console, I can't find how to input this kind of "default" value.
I saw on https://docs.qgis.org/2.2/en/docs/user_manual/processing/console.html that it seems to be mandatory to input the four coordinates for an extent parameter.
I tried using
iface.mapCanvas().extent() but the object returned is not accepted as a parameter and I can't find how to get its coordinates..
Is there a way to get the
xmin, ymin, xmax, ymax of the layer in PyQGIS to input them in the algorithm? Am I doing it totally wrong ?