[GRASS-dev] [GRASS GIS] #2349: CELL raster format: make ZLIB level 3 standard compression instead of RLE

[GRASS GIS]

#2349: CELL raster format: make ZLIB level 3 standard compression instead of RLE
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  Reporter:  neteler      |      Owner:  grass-dev@…
      Type:  enhancement  |     Status:  new
  Priority:  critical     |  Milestone:  7.1.0
 Component:  Raster       |    Version:  svn-trunk
Resolution:               |   Keywords:  compression, r.compress, null
       CPU:  Unspecified  |   Platform:  All
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Comment (by glynn):

 Replying to [comment:19 neteler]:

 > Are my tests wrong or am I missing anything else?

 First, it shouldn't be necessary to recompile anything except lib/raster
 (but you should probably run "make clean" in that directory first, as the
 patch changes the R!__ and fileinfo structures which are used throughout
 the library).

 Second, you need to use
 {{{
 export GRASS_COMPRESS_NULLS=1
 }}}
 in order for compressed null files to be generated
 (cell_misc/<name>/null2).

 Reading should automatically use the compressed null file if it exists or
 the raw null file if it doesn't.

 If you don't set GRASS_COMPRESS_NULLS, everything should continue to work
 as before (including r.null and r.support). If it doesn't, that needs to
 be fixed now (i.e. before the changes committed; issues which only arise
 when setting GRASS_COMPRESS_NULLS can be dealt with later).

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Ticket URL: <http://trac.osgeo.org/grass/ticket/2349#comment:20>
GRASS GIS <http://grass.osgeo.org>