How do I use gdal_proximity.py from the QGIS python console?

Question

How do I run gdal_proximity.py from the QGIS python console?

Answer 1

With the Python processing module (look at Using processing algorithms from the console)

1) look at the Processing Toolbox, there is a proximity command [GDAL] Analysis/proximity:

2) in the Python console

>>> import processing
>>> # list of algorithms (a lot ...)
>>> processing.alglist()
.....
pct2rgb---------------------------------------------->gdalogr:pct2rgb
proximity-------------------------------------------->gdalogr:proximity
rgb2pct---------------------------------------------->gdalogr:rgb2pct
......
>>> processing.alglist('proximity')
Grid proximity buffer-------------------------------->saga:gridproximitybuffer
Proximity grid--------------------------------------->saga:proximitygrid
proximity-------------------------------------------->gdalogr:proximity

and

>>> # help for the parameters of the proximity algorithm
>>> processing.alghelp("gdalogr:proximity")
ALGORITHM: proximity
src_filename <ParameterRaster>
values <ParameterString>
maxdist <ParameterNumber>
nodata <ParameterNumber>
distunits <ParameterSelection>
fixed_buf_val <ParameterNumber>
dst_filename <OutputRaster>
  distunits(distunits)
0 -  GEO
1 - PIXEL

So you use:

>>> processing.runalg("gdalogr:proximity","your_src_filename",yourvalues,yourmaxdist,yournodata,"GEO",yourfixed_buf_val,"yourdst_filename")