[GRASS-dev] cell_misc

[Yann Chemin]

2008/6/13 Hamish <hamish_b at yahoo.com>:
> Yann Chemin wrote:
>> I am generating 60,000 maps from 60,000 original ones
>>  (shell script looping r.mapcalc),
>>
>> it says unable to create mapset element cell_misc $filename
>
> cell_misc/ saves each map's data in a subdirectory, not a file like the other raster element directories.  is this in a ext3 partition?

yes it is ext3

>
> can you break it up into mapsets of ~ 10k maps each, linked by g.mapsets search path? (thus < 32768 subdirectories/cell_misc)

I would want to avoid doing that since I need to use the data (it is
TRMM) in r.hydro.CASC2D, and it reads straight a filename to which it
adds <filename>.<incr_number>

Of course I could do it yearly and save parameters (eventually I may
have to do that...)

>
>> Since it is a (very) long process, I would like to know if
>> I should stop it now, or if it is not impacting of maps and
>> data?
>
> I think NULL data will be missing, if that is important to you.

Not important at all

> is it possible to stop where you are now and modify the script to restart it where it left off? or are later steps dependent on earlier?
>

yes it is possible to stop and restart (chronological datasets) even
at a different YYYMMDDHH

> it is sometimes nice to write variables to a small text file or so as it runs so you can "reseed" the second half of the calculation from an arbitrary point without having to rerun the first.
>
>

Yeah, I may have to do a yearly mapset structure, which would be ~5000
images (1/2 original, 1/2 processed)

> ?
> Hamish
>

Thanks Hamish



-- 
Yann Chemin
International Rice Research Institute
Office: http://www.irri.org/gis
Perso: http://www.freewebs.com/ychemin