[GRASS-dev] r.proj.seg disk space usage problem

[Hamish]

William Kyngesburye wrote:
> I had a chance today to try a VERY large raster with r.proj.seg.   
> 2.7GB raster, 55000x47000 cells.  The memory issue of r.proj have now 
> been moved to a HD space issue.  With 7.75GB free, it chokes at about 
> 75% in the allocating memory stage, while free space slowly drops to  
> zero, with an "Error writing segment file".
> It seems r.proj.seg, for its segmentation, creates an uncompressed  
> copy of the whole raster on the HD (instead of in memory).  I'm  
> guessing this has something to do with random access speed in rasters?
> 
> So I'm back to projecting pieces of the raster, but now so they fit  
> in my disk free space, and patching them together.  Disappointing,  
> but if that's the way it must be, I can live with it.


did you pump the memory= option up to a few hundred MB smaller than your
installed RAM?


Hamish