Kim Besson wrote: > Hi Markus > I did this: > r.out.gdal input=train_raste...@permanent > output=C:\Data\GISDataBase\trainraster00b nodata=-1
nodata = -1 and type = Byte is no good because the range of Byte is 0 - 255 and -1 gets converted to 255, i.e. all NULL cells will become 255 (all cells that are already 255 stay 255) but nodata is -1 so info about NULL cells gets lost. > And I got > <PROJ_INFO> not found for <DATA> > <PROJ_UNITS> not found for <PT_IGP> check the original Landsat data with gdalinfo. They are usually in UTM. If the original data don't have projection info, the xy location is correct and you have to manually reproject to a proper location. If the original data do have projection info, something went wrong while defining the location, no idea what. Markus M > Exporting to GDAL data type: Byte > Unable to set projection > Input raster map contains cells with NULL-value (no-data). The value -1 was > used to represent no-data values in the input map. You can specify nodata > value by nodata parameter. > It's strange. Then I decided to do g.region display and I realized that: > projection: 0 (x,y) > zone: 0 > north: 23020.21492744 > south: -190249.78507256 > west: -52163.16923233 > east: 177696.83076767 > nsres: 30 > ewres: 30 > rows: 7109 > cols: 7662 > cells: 54469158 > (Fri May 07 10:40:07 2010) Comando terminado (0 sec) > > (Fri May 07 10:40:30 2010) > > g.region -p > > projection: 0 (x,y) > zone: 0 > north: 23020.21492744 > south: -190249.78507256 > west: -52163.16923233 > east: 177696.83076767 > nsres: 30 > ewres: 30 > rows: 7109 > cols: 7662 > cells: 54469158 > I have NO PROJECTION :( How come? I have defined my Location from a > projected Landsat image the same that I have imported. Any clues of what I > did wrong? > 2010/5/7 Markus Metz <markus.metz.gisw...@googlemail.com> >> >> Kim Besson wrote: >> >> [snip] >> >> > 7- Now, export this raster.Since I want a Geotiff I used: >> > r.out.tiff input=train_raste...@permanent output=trainraster00a >> >> You must use r.out.gdal to get a GeoTIFF, r.out.tiff produces an >> ordinary tif image, not a spatial raster dataset. >> >> Markus M > > _______________________________________________ grass-user mailing list grass-user@lists.osgeo.org http://lists.osgeo.org/mailman/listinfo/grass-user
