[GRASS-user] Help; Running Grass from R without installing GRASS

[Mehrdad Varedi]

Thank you for your time and sharing your knowledge Micha for the second
time.

I followed your code and found that initGRASS searches for libraries and
binaries of GRASS in gisBase folder. If we address a folder that doesn't
have the code it comes back with this error message: "The code execution
cannot proceed because libgrass_gis.7.4.1.dll was not found. Reinstalling
the program may fix this problem." it gives the same error even if I copy
that file into GISBase folder.

I want to run my code on a shiny server which I can't install GRASS
although I can copy files and libraries. Can I solve this issue by copying
a certain folder of GRASS binaries with my app or I am going the wrong path?

Please advise,

Thank you once again for all the time you share to answer my questions,

Mehrdad


ᐧ

On Sun, Apr 28, 2019 at 10:55 AM Micha Silver <tsvibar at gmail.com> wrote:

>
> On 27/04/2019 22:05, Mehrdad Varedi wrote:
>
>
> Hi Everyone,
> I have detail explanations of connecting to an existing dataset in GRASS
> from R in this address:
> https://grasswiki.osgeo.org/wiki/R_statistics/rgrass7
>
> What I hope I could do is to create a GRASS dataset in R on the fly and
> without the need to install GRASS or create a dataset on it. Is there any
> way to do this?
>
> Maybe this will help:
>
> (You must have GRASS installed, of course)
>
>
> # Parameters for the GRASS installation and temporary GRASS mapset
>
> GISBase = "/usr/lib/grass76"
> # Set these as you like
>
> GISDbase = "/tmp"
> Location = "tmp_location"
> Mapset = "tmp_mapset"
> georef = "EPSG:2039"
>
> mapset_path = file.path(GISDbase, Location, Mapset)
>
> # Now run the 'grass' command within R and
>
> # use the -c and -e flags to create the temp mapset, then exit
>
> setup_grass_cmd = paste("grass", "-c", georef, "-e", mapset_path)
>
> system(setup_grass_cmd)
>
>
> # Load the R grass interface and initialize GRASS within R,
>
> # using the temporary mapset from above
>
> library(rgrass7)
> initGRASS(home=tempdir(),
>           gisBase = GISBase,
>           gisDbase = GISDbase,
>           location = Location,
>           mapset = Mapset,
>           remove_GISRC = TRUE)
>
>
> # Try some GRASS commands
>
> input_tif = "isrlat12.tif"
>
> grass_rast = "isrlat12"
> execGRASS("r.in.gdal",  flags = c("o","overwrite"),
>           input = input_tif,
>           output = grass_rast)
> execGRASS("g.region", flags="p", raster = grass_rast)
>
> I did not add a command to remove the temporary mapset.  Something like:
>
> unlink(file.path(GISDbase, Location), recusive = TRUE) might be necessary
>
>
> One other note: you probably will get better suggestions on the R-sig-geo
> list...
>
>
> i.e. I have a vector /raster file and use that to identify the region and
> details required to set up a dataset and use GRASS functions just by
> including rgrass library.
>
> Thanks for your help and attention,
>
> Mehrdad
> --
> Mehrdad Varedi
> ᐧ
>
> _______________________________________________
> grass-user mailing listgrass-user at lists.osgeo.orghttps://lists.osgeo.org/mailman/listinfo/grass-user
>
> --
> Micha Silver
> Ben Gurion Univ.
> Sde Boker, Remote Sensing Lab
> cell: +972-523-665918
>
>

-- 
Mehrdad Varedi
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