On Tue, 10 May 2011, Sam Prentice wrote:
Hi,
I'm running R 2.12.2 via Tinn-R on Windows Server 2008. I'm using R for
cluster analysis for terrain classification and I'm getting the following
error when parsing GRASS data into R:
x =
readRAST6(c("param_elev3","param_crosC_1m","param_longC_1m","param_slope5","
param_profC","param_miniC_1m","param_maxiC_1m"))
D:/GRASSdata/Sedgwick2/PERMANENT/.tmp/param_elev3 has GDAL driver GTiff
and has 6224 rows and 6242 columns
Is the difficulty perhaps associated with the size of these rasters? The
total size of the object will be over 2GB, are you using 64-bit Windows?
How much memory do you have (over 16GB?)? Have you considered exporting
the data manually (or using execGRASS()) from GRASS and using the raster
package to use the data without necessarily reading it all into R, which
will try to hold everything in memory unless you choose not to do so?
Could you make the same classification on subsets of your data? If you set
your GRASS region to say 1000 by 1000, the problem may be resolved,
because the object size will be much smaller, about 50MB. Older versions
of r.out.gdal in GRASS, used here for loose coupling, did not respect
region settings - is your GRASS version current, and the output region as
chosen?
Hope this helps,
Roger
Error in deleteDataset(DS) :
GDAL Error 1: Deleting
D:/GRASSdata/Sedgwick2/PERMANENT/.tmp/param_elev3 failed:
Permission denied
On the surface this looked like an issue with user privileges, since I do
not have admin-level user privileges on this machine. However, this has been
corrected - I now have permissions on the .tmp directory listed in the
error, and I can create, append, and delete any file in that location, but
the error is still occurring.
Thoughts?
Thanks,
Sam
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--
Roger Bivand
Economic Geography Section, Department of Economics, Norwegian School of
Economics and Business Administration, Helleveien 30, N-5045 Bergen,
Norway. voice: +47 55 95 93 55; fax +47 55 95 95 43
e-mail: [email protected]
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