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

[Micha Silver]

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 list grass-user@lists.osgeo.org https://lists.osgeo.org/mailman/listinfo/grass-user -- Micha Silver Ben Gurion Univ. Sde Boker, Remote Sensing Lab cell: +972-523-665918

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