[GRASS5] bugs

Markus Neteler neteler at geog.uni-hannover.de
Thu Jan 18 09:55:23 EST 2001

Hi there,

On Wed, Jan 17, 2001 at 10:59:50PM -0800, Eric G . Miller wrote:
> On Wed, Jan 17, 2001 at 10:40:38PM -0600, Helena Mitasova - staff wrote:
> [snip]
> > I too think that beta11 should be released ASAP and that 
> > the LZW should be removed now - it will be too late to
> > do it after beta11, I am worried about it because i have 
> > about million FP raster files, but it really needs to be done and
> > tested.

I fully agree to switch off LZW NOW! 
If o.k., I'll do it in one hour.
> Helena, I have a GRASS module that will perform the translation from LZW
> to LIBZ compression for floating point rasters an entire mapset at a
> time.  It tries to be paranoid about making sure it can read what it
> writes; so, the data is read/decoded/recoded to a temp file, then reread
> and if successful transferred back to the original.  It seems to work
> okay (but has had little testing) -- http://www.jps.net/egm2/r.lzw2z.tgz

Helena, I have tested it, it is o.k. 

> It's meant entirely for those situations where a copy of an earlier
> version of GRASS is not readily available.  Haven't worked out how to
> distribute it, since it contains the offending LZW code.

Question is if we shall integrate it into GRASS or not for the users.

> (A shell script to run "r.compress -u" using earlier version of GRASS
> before upgrading might be a little safer).
I have already written such script and the announcement:

-> fp_uncompress.sh: uncompress all raster maps. Save and run within your
   old GRASS 5
-> fp_recompress.sh: recompress all raster maps with DEFLATE. Save and run
   within new GRASS 5

It runs r.compress.


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