[GRASS-dev] Re: [GRASS GIS] #73: r.out.gdal tiff output does not work

[GRASS GIS]

#73: r.out.gdal tiff output does not work
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  Reporter:  helena       |       Owner:  grass-dev at lists.osgeo.org
      Type:  defect       |      Status:  new                      
  Priority:  critical     |   Milestone:  6.4.0                    
 Component:  Raster       |     Version:  svn-trunk                
Resolution:               |    Keywords:  r.out.gdal, tiff         
  Platform:  Unspecified  |         Cpu:  Unspecified              
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Comment (by mmetz):

 Replying to [comment:14 neteler]:
 > Great work!
 Thanks!
 > Would you mind to also test  back-import into GRASS?
 All GeoTIFFs previously exported with the test version of r.out.gdal were
 back-imported to GRASS-6.4.svn (snapshot_2008_08_23)

 GeoTIFF files:[[BR]]
 elevation.Byte.clrtbl.tif[[BR]]
 elevation.Byte.noclrtbl.tif[[BR]]
 elevation.UInt16.clrtbl.tif[[BR]]
 elevation.UInt16.noclrtbl.tif[[BR]]
 elevation.Int32.noclrtbl.tif[[BR]]
 elevation.Float32.noclrtbl.tif

 display: all ok, very slow for the UInt16 back-import with
 colortable[[BR]]
 colortable: all ok[[BR]]
 cell values: all ok[[BR]]
 nodata: all ok

 Back-importing elevation.UInt16.clrtbl.tif is pretty slow. Display takes
 quite some time too. It is a colortable with 65535 entries, one for each
 potential cell value, an exact copy of the GeoTIFF colortable. Removing
 the colortable with r.colors -r, then copying the colortable of the back-
 import of elevation.Byte.clrtbl.tif results in the same display, but now
 fast on refresh, as expected.

 Back-import of all other GeoTIFF files is fast, as is display in GRASS.

 I would prefer to use r.out.gmt to get the GRASS color rules into an extra
 file (GMT .cpt). This would also be a workaround for export file types
 other than Byte and UInt16 where GDAL does not support writing out a
 colortable. But then I don't know how widely GMT .cpt files are supported.

 Markus

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Ticket URL: <http://trac.osgeo.org/grass/ticket/73#comment:15>
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