[GRASS-dev] [SoC] Weekly report #3 - GRASS Interactive Scatter Plot Tool

[Pietro Zambelli]

Hi Štěpán,

On Sunday 07 Jul 2013 13:55:15 Štěpán Turek wrote:
> many thanks for big help. If I understand it correctly, the key, which will
> solve my issue, is the multiprocessing  module, which allows to define
> region just in this process without affecting the others (as it is in the
> modules). Thanks to that it will be possible to use raster library in the
> backend and get rid of files produced by r.out.bin.


yes, you can just run your command giving the right environment variables...

{{{
import subprocess as sub

sub.Popen(['grasscmd', 'option', etc.], env={dictionary with your variables})
}}}

I've used it in the pygrass.modules.grid to split the grass operations in 
several 
independent processes running the same command in different mapsets with 
different regions. You can have a look here:

http://trac.osgeo.org/grass/browser/grass/trunk/lib/python/pygrass/modules/grid/grid.py#L34


> [snip]
> Extending PyGRASS to provide access to the backend  is good idea. I will do
> so.

Please ask me if you have any doubts... I will be happy to help! :-)

Have a nice day!

Pietro