#73: r.out.gdal tiff output does not work --------------------------+------------------------------------------------- Reporter: helena | Owner: grass-dev@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 --------------------------+------------------------------------------------- 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 -- Ticket URL: <http://trac.osgeo.org/grass/ticket/73#comment:15> GRASS GIS <http://grass.osgeo.org>
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