(back to an older question) On Sun, Dec 11, 2011 at 10:39 PM, Markus Neteler <[email protected]> wrote: > Hi, > > since my office grassdata/ becomes huge, I wonder if I should > change to zlib compression. > > From the "variables.html" page I get (btw: no mention of this in > the r.compress manual!):
I have now updated the manual page. > GRASS_INT_ZLIB > [libgis] > if the environment variable GRASS_INT_ZLIB exists, new compressed > rasters will be compressed using zlib instead of RLE compression. Such > rasters will have a compressed value of 2 in the cellhd file. > Obviously, decompression is controlled by the raster's compressed > value, not the environment variable. > > I wonder what the performance penalty of zlib could be. Does > anyone have experience? An advantage of stronger compression > could be that the data traffic on NFS on a cluster becomes less... > > Opinions welcome, > Markus Meanwhile I discovered the .xz file format: http://en.wikipedia.org/wiki/Xz http://tukaani.org/xz/format.html Maybe worth to be implemented in GRASS? Markus _______________________________________________ grass-dev mailing list [email protected] http://lists.osgeo.org/mailman/listinfo/grass-dev
