[GRASS-user] export from Grass raster to R

GRASS GRASS user
,
1

Hi all,

I’m using GRASS 7svn on WIndows, and am wondering about the export to R feature.
The GUI gives the impression i can export from a GRASS raster to an ‘R Data Object Store’. supported formats for r.out.gdal include R

When i try it, it gives an error after seeming to process it, and generates a large file. However i cant open it, and dont know how to bring it into R.
Is it supposed to be an R SpatialGrid object?

Driver does not support direct writing. Using MEM driver for intermediate dataset.
Checking GDAL data type and nodata value…
Input raster map contains cells with NULL-value (no-data). The value nan will be used to represent no-data values in the input map. You can specify a nodata value with the nodata option.
Exporting raster data to R format…
ERROR 4: `ndvi2.R’ not recognised as a supported file
format.
ERROR: Unable to create raster map <ndvi2.R> using driver
(Thu Aug 28 16:14:19 2014) Command finished (9 sec)

Thanks for any input,
Vishal

–
Vishal K. Mehta, PhD
Sr Scientist
Stockholm Environment Institute - US
400 F St
Davis CA 95616
www.sei-us.org

2

Vishal,

You need to install the R contributed spgrass6 and raster packages; look at:

http://grasswiki.osgeo.org/wiki/R_statistics

ftp://195.37.229.5/pub/outgoing/mforkel/Rcourse/spatialR.pdf

Regards,
Tom

···

On Thu, Aug 28, 2014 at 7:15 PM, Vishal Mehta <vishalm1975@gmail.com> wrote:

Hi all,

I’m using GRASS 7svn on WIndows, and am wondering about the export to R feature.
The GUI gives the impression i can export from a GRASS raster to an ‘R Data Object Store’. supported formats for r.out.gdal include R

When i try it, it gives an error after seeming to process it, and generates a large file. However i cant open it, and dont know how to bring it into R.
Is it supposed to be an R SpatialGrid object?

Driver does not support direct writing. Using MEM driver for intermediate dataset.
Checking GDAL data type and nodata value…
Input raster map contains cells with NULL-value (no-data). The value nan will be used to represent no-data values in the input map. You can specify a nodata value with the nodata option.
Exporting raster data to R format…
ERROR 4: `ndvi2.R’ not recognised as a supported file
format.
ERROR: Unable to create raster map <ndvi2.R> using driver
(Thu Aug 28 16:14:19 2014) Command finished (9 sec)

Thanks for any input,
Vishal

–
Vishal K. Mehta, PhD
Sr Scientist
Stockholm Environment Institute - US
400 F St
Davis CA 95616
www.sei-us.org

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