Rainer M Krug wrote: > It would be nice, if grass would be able to deal with on-the-fly > decompression - not from a .tar.gz file, but from gz compressed files.
GRASS rasters are already compressed by default, either using RLE or zlib compression (OTOH, the null bitmap isn't compressed; that will cease to be an issue if we embed nulls into the raster data). But GRASS doesn't generally read data from files per se, but from either the GRASS "database" or from GDAL (and the former might eventually go away if we can get "native" GRASS support into GDAL). The main issue with on-the-fly decompression using general-purpose formats is that rasters aren't guaranteed to be read sequentially, while compression algorithms require sequential access. Similarly, while there exist filesystems which can mount archives, tar files (and especially compressed tar files) are a poor choice, as they are designed for sequential access. ZIP/RAR are more suited to such tasks. Ultimately, I don't think that this situation is common enough to be worth doing anything about. If you want to access archived data, you just unpack the archives first (or use an archive format which can be mounted). -- Glynn Clements <gl...@gclements.plus.com> _______________________________________________ grass-user mailing list grass-user@lists.osgeo.org http://lists.osgeo.org/mailman/listinfo/grass-user