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

[Stefan Blumentrath]

Hi Mehrdad,

If this is a permission issue, and the dependencies (and a build environment) are installed, you could try compile GRASS (and install it in your home directory if necessary with the --prefix configure option).
svn checkout https://svn.osgeo.org/grass/grass/ grass_trunk
cd grass_trunk
./configure
make
make install
The make install step is not required for starting GRASS though. The make commando creates a bin…/ directory within the grass_trunk dir, where the grass startupscript is located…

Hope that helps.

Cheers,
Stefan



From: grass-user <grass-user-bounces at lists.osgeo.org> On Behalf Of Mehrdad Varedi
Sent: søndag 28. april 2019 18:31
To: Micha Silver <tsvibar at gmail.com>
Cc: grass-user <grass-user at lists.osgeo.org>
Subject: Re: [GRASS-user] Help; Running Grass from R without installing GRASS

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


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

Micha Silver

Ben Gurion Univ.

Sde Boker, Remote Sensing Lab

cell: +972-523-665918


--
Mehrdad Varedi
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