[GRASS-user] Parallel GRASS jobs .....

[Daniel Lee]

Hi there,

I do this too and the standard methodology for me is to leave the
resolution the same and change the region's borders. Take a look at the
manual of g.region for guides on this, but let's say I've got the following:

GRASS 6.4.3svn (EPSG4326_WGS84_ll):~ > g.region -g
n=63
s=-63
w=95
e=180
nsres=1.10020395685734e-05
ewres=1.10020399076346e-05
rows=11452422
cols=7725840
cells=88479579984480

Then to reduce the region's size I'd do e.g.:
g.region n=50 s=-50 w=100 e=110

That would "shrink" my region down to the area that I'm interested in.

HTH!
Daniel


2012/11/28 Andranik Hayrapetyan <andranik.h89 at gmail.com>

> I have been trying something like this some time ago, but I could not
> define region of a mapset as chunk of the whole region.
> I was trying to do that with g.region, but it only resized my map and
> didn't "cut" it.
>
> Is g.region the right tool for this task?
> If it is not difficult for you, can you, please, explain the process of
>  doing  " *define the region of each mapset as a chunk of the whole region
> * " a bit more detailed.
>
>
> On Wed, Nov 28, 2012 at 1:56 PM, Sylvain Maillard <
> sylvain.maillard at gmail.com> wrote:
>
>> Hi,
>>
>> for this approach, the best would be to
>> (before the multi-process job)
>> - put your map into the PERMANENT mapset
>>
>> (for each process in parallel)
>> - make a new mapset for each process
>> - define the region of each mapset as a chunk of the whole region
>> - make your calculation
>>
>> (once the process competed)
>> - put together all the results (eg, with r.patch)
>>
>>
>> Sylvain
>>
>>
>>
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>>
>
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