[GRASS-user] Best format for exporting raster data

[Rainer M Krug]

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On 31/08/10 16:56, Sylvain Maillard wrote:
> Perhaps can you add an extra loop in your scripts for processing your data:
> 1 - extract the tarball
> 2 - import the raster in R
> 3 - and then delete the temporary uncompressed mapset.

Yes - that would be the "crude force" approach. In my case, it would
very likely take more time, as there are MANY more layers in the .tar.gz
then I use.
I am now thinking about extracting all files with "fire" in  them and to
use this subset as a mapset - I will see if it works.

It would be nice, if grass would be able to deal with on-the-fly
decompression - not from a .tar.gz file, but from gz compressed files.

Cheers,

Rainer


> it will take a little bit more space but just for one mapset at a time,
> and I don't thing the process will be much slower than to access the
> files directly into the compressed tarball ...
> 
> you can also buy more hard drive :D
> 
> if you make some benchmark test between different solution I will be
> interreted in the results, I'm also working on a huge amound of raster
> data within GRASS and R ...

I'll do - although I don't think I will do benchmarks at that time.

Cheers,

Rainer


> 
> regards,
> Sylvain Maillard
> 
> Doctorant en Sciences de l'Environnement
> Laboratoire Chimie Provence - UMR 6264 / Université de Provence
> la Tour du Valat - Centre de recherche pour la conservation des zones
> humides méditerranéennes
> Le Sambuc
> 13200 Arles
> France
> tél:04.90.97.29.79
> fax:04.90.97.20.19
> www.tourduvalat.org <http://www.tourduvalat.org>
> 
> 
> 
> 2010/8/31 Rainer M Krug <r.m.krug at gmail.com <mailto:r.m.krug at gmail.com>>
> 
> On 31/08/10 16:38, Markus Neteler wrote:
>> On Tue, Aug 31, 2010 at 4:13 PM, Rainer M Krug <r.m.krug at gmail.com
> <mailto:r.m.krug at gmail.com>> wrote:
>> ...
>>>> I would leave it in GRASS and use the R-GRASS interface and/or the
>>>> GDAL-GRASS plugin. See the Wiki for details.
>>>
>>> I am doing that already - but I don't think that works when I
> have the
>>> grass mapset compressed as a .tar.gz?
> 
>> I found "archivemount" which apparently lets you
>> mount a possibly compressed tarball as a filesystem:
> 
>> http://en.wikipedia.org/wiki/Archivemount
>> http://www.linux.com/archive/feature/132196
> 
> Sounds interesting - I'll look into that.
> 
> Thanks,
> 
> Rainer
> 
> 
>> Cheers
>> Markus
> 
> 
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- -- 
Rainer M. Krug, PhD (Conservation Ecology, SUN), MSc (Conservation
Biology, UCT), Dipl. Phys. (Germany)

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