[GRASS-user] r.denoise segfaults on a raster of 1166468401 cells

[Nikos Alexandris]

Nikos:
 
> > The following attempt segfaults on GRASS 6.4.3svn (nearly in the end of
> > the process, if I am not wrong), running on Core i7 with 32GB of RAM.

> > # mdenoise ASTER GDEM2 over Greece
> > r.denoise in=aster_gdem2_ellas out=aster_gdem2_ellas_smoothed iterations=1
> > threshold=0.8 epsg=2100

> > The computational area comprises (Rows: 32401, Columns: 36001) 1166468401
> > cells.  Is this too much?

> > Would (re-)running this on GRASS 7.0.svn make any difference?
> > I should better perform the process on a per (ASTER GDEM2) tile(s) basis,
> > shouldn't I?

Alexander Muriy:

> Hi Nikos. In my experience, <mdenoise> utility works well with raster sizes
> no more than 2000x2000 (regardless of RAM size). That's why the only way to
> denoise the large rasters — using of tiles and patching of final results.

Of course! Yet, what about differently smoothed tile borders?  Any additional 
hints?

Nikos