Use GRASS through R

Question

I want to use GRASS GIS 7 through R 3.1.3 in kubuntu operational system. Could someone help me connect GRASS with R, and use GRASS commands through R (not the other way round!).

Answer 1

Here is a quick worked example of setting the GRASS environment, reading an on-disk raster, calculating a focal mean (using r.neighbors) and reading the results back into R. Hopefully this will get you started.

if (!require(rgrass7)) stop("rgrass7 PACKAGE MISSING")

setwd("D:/TMP") # Working directory 

# Set on-disk raster variable
rname <- paste(getwd(), "elev.img", sep="/")

# Set GRASS environment and database location 
loc <- initGRASS("C:/Program Files (x86)/GRASS GIS 7.0.0", 
       home=getwd(), gisDbase="GRASS_TEMP", override=TRUE )

# Import raster to GRASS and set region
execGRASS("r.in.gdal", flags="o", parameters=list(input=rname, output="tmprast"))
execGRASS("g.region", parameters=list(raster="tmprast") ) 

# Calculate 9x9 focal mean 
execGRASS("r.neighbors", flags="overwrite", parameters=list(input="tmprast", output="xxfm", 
          method="average", size=as.integer(9)) )

r <- readRAST("xxfm")
  spplot(r)

Answer 2

Thank you very much for your responses! Eventually, is very very easy to work with GRASS GIS through R. After you have created in GRASS the location and mapset in which you wish to work, you can type in the GRASS shell: "rstudio &" "&" Helps for working simultaneously in both GRASS GIS and R. Otherwise, the GRASS shell would switch to R. And that is for Linux!