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How to call processing toolbox in Qgis' python console.md

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From How to call processing toolbox in Qgis' python console

To learn the processing module in Python, the easiest solution for me is:

  1. execute the Processing command (from the Toolbox), for example v.to.rast.val
  2. examine the "processing_qgis.log" file in the ".qgis2/processing/" folder

where you can examine all the running algorithms:

 ALGORITHM|Mon Oct 28 2013  
 12:30:34|processing.runalg("grass:v.to.rast.value","/Users/Shared/polygon.shp",0,1,"202563.92575,204206.182887,89106.9864984,89783.2100251",0,-1,0.0001,"/Users/Shared/polyraster.tif")

The actual commands are in:

  • "grass_batch_job.sh" or "grass_batch_job.bat" files (in the ".qgis2/processing/" folder) for GRASS GIS;
  • "saga_batch_job.sh" or "saga_batch_job.bat" files for SAGA GIS;
  • "processing_script.r" file for R.

So, in the Python console:

    import processing
    processing.runalg("grass:v.to.rast.value","/Users/Shared/polygon.shp",0,1,"202563.92575,204206.182887,89106.9864984,89783.2100251",0,-1,0.0001,"/Users/Shared/polyraster.tif")
    processing.runalg("grass:r.statistics","/Users/Shared/polyraster.tif","/Users/Shared/mydem.asc",1,True,"202086.577,205625.414407,88411.048,90534.3504441",0,"/Users/Shared/test.tif")

You can also use one of the displayed layers:

    vectorlayer = qgis.utils.iface.mapCanvas().currentLayer().source()
    processing.runalg("grass:v.to.rast.value",vectorlayer,0,1,"202563.92575,204206.182887,89106.9864984,89783.2100251",0,-1,0.0001,"/Users/Shared/polyraster.tif")

but before, you need to understand all the parameters of the command r.statistics and the problems as r.statistics limitation to CELL