[GRASS-user] New CLI option --tmp-location in 7.5 to enhance --exec

[Pierre Roudier]

Thanks Stephan,

I'm aware of rgrass7 and spgrass6 -- I had in mind a package a lot
lighter, that basically "hides" the specificities of GRASS (eg the
notions of GRASSDATA, of locations, of mapsets...) from the user, and
just run a GRASS command on a GDAL/OGR type file.

Cheers,

P


On 16 August 2018 at 20:37, Stefan Blumentrath
<Stefan.Blumentrath at nina.no> wrote:
> Dear Pierre,
>
> Just in case you are not aware of it, GRASS and R integrate very nicely:
> https://grasswiki.osgeo.org/wiki/R_statistics/rgrass7
>
> Cheers,
> Stefan
>
> -----Original Message-----
> From: grass-user <grass-user-bounces at lists.osgeo.org> On Behalf Of Pierre Roudier
> Sent: torsdag 16. august 2018 10:07
> To: Vaclav Petras <wenzeslaus at gmail.com>
> Cc: GRASS user list <grass-user at lists.osgeo.org>
> Subject: Re: [GRASS-user] New CLI option --tmp-location in 7.5 to enhance --exec
>
> Thanks Vaclav,
>
> Looks like a great enhancement. It should make it easy to wrap it into a R package for example.
>
> One question -- is that possible to refer to the input dataset in the script called by --exec? Something like:
>
> grass --tmp-location ~/data/elevation.tiff --exec "r.param.scale in=myinput out=myoutput param=slope size=9"
>
> Cheers,
>
> P
>
> On 15 August 2018 at 15:20, Vaclav Petras <wenzeslaus at gmail.com> wrote:
>> Dear user list,
>>
>> The (main) GRASS GIS executable, usually available as simply `grass`
>> on most systems has now a new option (flag/parameter) in trunk (aka
>> 7.5). The option is called --tmp-location.
>>
>> When specified, GRASS GIS automatically creates an new (and empty)
>> location based on provided EPSG code or georeferenced file (similarly
>> to what -c flag does). Newly it is also possible to provide string
>> "XY" instead of EPSG to create XY (non-georeferenced) location.
>>
>> This temporary location has only PERMANENT mapset and the whole
>> location is removed. The location is created in a temporary directory
>> (which is also deleted at the end).
>>
>> The flag --tmp-location is meant to be used together with --exec and
>> it is a part of a lager endeavor to make the CLI easier for use from
>> outside of the GRASS GIS session.
>>
>> If you are interested, please, test this new functionality. It is an
>> opportunity to provide feedback before this feature lands in the 7.6
>> release.
>>
>> Here are some things to try:
>>
>> * Execute a module in a location created based on EPSG:
>>
>>   grass --tmp-location EPSG:3358 --exec g.region -p
>>
>> * Execute Python script in a location created based on EPSG:
>>
>>   grass --tmp-location EPSG:3358 --exec script.py
>>
>> * Examine the created location using a Bash command:
>>
>>   grass --tmp-location EPSG:3358 --exec bash -c "g.proj -p && g.region
>> -p && g.mapset -p && g.gisenv GISDBASE,LOCATION_NAME sep=/"
>>
>> * Get SRS/CRS for a file:
>>
>>   grass --tmp-location ~/data/elevation.tiff --exec g.proj -p
>>
>> * Get help text for a module:
>>
>>   grass --tmp-location XY --exec r.neighbors --help
>>
>> See the documentation and `grass --help` for more hints (and let me
>> know how these can be enhanced).
>>
>> Best regards,
>> Vaclav
>>
>>
>> https://trac.osgeo.org/grass/ticket/3537
>> https://trac.osgeo.org/grass/ticket/3585
>> https://trac.osgeo.org/grass/ticket/3586
>> https://trac.osgeo.org/grass/changeset/72790
>> https://trac.osgeo.org/grass/changeset/73096
>> https://trac.osgeo.org/grass/changeset/73098
>> https://trac.osgeo.org/grass/changeset/73099
>>
>>
>>
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