[GRASS-user] Best format for exporting raster data

Rainer M Krug r.m.krug at gmail.com
Wed Sep 1 04:32:57 EDT 2010


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On 01/09/10 10:15, Rainer M Krug wrote:
> 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.

I am trying archivemounter and it has some interesting benchmarks on the
website http://www.linux.com/archive/feature/132196

Cheers,

Rainer

> 
> 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)

Centre of Excellence for Invasion Biology
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