[GRASS-dev] any special reason why choice of raster compression method is done via environmental variable ?

[Huidae Cho]

One workaround may be GRASS_COMPRESSOR=method r.compress, but it won't
directly work on MS-Windows without a batch file, I think.

Huidae

On Tue, Dec 10, 2019 at 12:47 AM Moritz Lennert <
mlennert at club.worldonline.be> wrote:

> On 9/12/19 22:50, Markus Metz wrote:
> >   Hi Moritz,
> >
> > On Wed, Dec 4, 2019 at 10:28 AM Moritz Lennert
> > <mlennert at club.worldonline.be <mailto:mlennert at club.worldonline.be>>
> wrote:
> >  >
> >  > Hi Markus,
> >  >
> >  > In recent days, I've been confronted several times with the issue of
> >  > people trying to share data among themselves, but using different
> >  > versions of GRASS, and so raster data compressed in a more recent
> >  > version of GRASS was not usable in an older version of GRASS.
> >  >
> >  > Now, I agree that generally the solution is to tell people to use the
> >  > latest and greatest, but this is not always possible / it is not
> >  > necessarily highest on the list of priorities of people to see how
> they
> >  > can install the latest version of GRASS within their particular
> > environment.
> >  >
> >  > Obviously, those with the latest version of GRASS can simple
> recompress
> >  > using ZLIB. However, compression method is defined as an environment
> >  > variable. This is somewhat daunting to many MS Windows users out
> there.
> >  > Is there any specific reason that lead to the choice of not using a
> >  > parameter to allow the choice of compression method (possibly to
> >  > override a default that is still defined by an environment variable) ?
> >
> > Such a parameter would need to be added to every module creating raster
> > output.
>
> My request is more linked to use cases where one would like to share
> data (e.g. with r.pack) with other GRASS GIS users who do not
> necessarily have access to the same compression method, not necessarily
> to changing the default compression method. I was just wondering whether
> it might be easily possible to just implement r.compress method= as a
> quick way to recompress a specific map with a chosen method, overriding
> the default method. Currently, to do that, you have to change the
> default method by changing the env variable, run r.compress, then change
> the variable back to the value one wishes generally to use as default.
>
> Obviously, you can always just export as tiff and share that, but that
> just feels less elegant. Anyway, this is probably somewhat of a luxury
> problem :-)
>
> Moritz
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-- 
Huidae Cho, Ph.D., GISP, PE (MD), CFM, M.ASCE
Open Source GIS Developer, GRASS GIS Development Team
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