Dear Markus, Using GTiff (in grass version 8.3.0 and with gdal 3.7.1) solved the problem. I get a compressed file and the use of RAM is acceptable. I still get the same errors when using COG. A quick test with a different file in grass 8.2.1 and gdal 3.6.4 (previous configuration) indicates that it would be the same there, but I could not test it with the original file because of some hardware issues.
Thanks a lot! Laura On Thu, 22 Jun 2023 at 09:16, Markus Neteler <[email protected]> wrote: > Hi Laura, > > On Thu, Jun 15, 2023 at 5:00 PM Laura Poggio <[email protected]> > wrote: > > > > Dear all, > > Apologies, sent to the developer mailing list by mistake. > > I am trying to save a rather large file from GRASS > > > > Versions: > > GRASS GIS 8.2.1 > > GDAL 3.6.3, released 2023/03/07 > > Linux: almalinux:9.1 > > > > The size of the file is: > > rows=141120 > > cols=362880 > > cells=51209625600 > > > > This the command > > r.out.gdal -c input=out output=output.tif format=COG type=Int16 > createopt=COMPRESS=LZW,PREDICTOR=2,BIGTIFF=YES --overwrite --quiet > > > > This the output > > Warning 6: driver MEM does not support creation option COMPRESS > > Warning 6: driver MEM does not support creation option PREDICTOR > > Warning 6: driver MEM does not support creation option BIGTIFF > > ERROR 2: /usr/gdal-3.6.2/frmts/mem/memdataset.cpp, 1289: cannot allocate > 1x102419251200 bytes > > ERROR: Unable to create dataset using memory raster driver > > > > Is there any option not to use the MEM driver when writing to disk? > > I am not sure, in this code section it doesn't look like this: > > > https://github.com/OSGeo/grass/blob/51e962abbc1176211ad2c4cb7857a61a2b6d1c6f/raster/r.out.gdal/main.c#L377 > > Maybe someone else in the list has more insights? > > Some options: > - try first the GTiff driver, then convert to COG with gdal_translate > - enlarge RAM using a swap file (no reboot needed but sudo access > needed) as disk space is relatively cheap and r.out.gdal will not > realize then that it gets swapped. > > Best, > Markus > > -- > Markus Neteler, PhD > https://www.mundialis.de - free data with free software > https://grass.osgeo.org > https://courses.neteler.org/blog >
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