I saw the symbol <> first time in gdal calc what is meaning of it? Thanks
On Wed, Nov 19, 2014 at 10:21 PM, Even Rouault <[email protected]> wrote: > Le mercredi 19 novembre 2014 14:16:05, Andreas Neumann a écrit : > > Hi Even, > > > > Thank you for trying to help. Unfortunately, the --overwrite option does > > not help. > > > > I have a very small test file at http://webgis.uster.ch/temp/test.tif > > > > I used the following options: > > > > gdal_calc.py -A test.tif --overwrite --outfile=testcalc.tif > > --calc="(A==249)*255+(A<>249)*A" > > > > All pixels with values of "255" are now "nodata" after running gdal_calc > > ;-( > > I wrote "as well", so try with "--overwrite --nodata 99". > > > > > May I please ask you to test/verify this? > > > > Thanks a lot! > > > > Andreas > > > > Am 2014-11-19 13:58, schrieb Even Rouault: > > > Le mercredi 19 novembre 2014 13:49:48, Andreas Neumann a écrit : > > >> Hi, > > >> > > >> I have an issue with gdal_calc.py and nodata values. > > >> > > >> My input data contains a lot of white pixels. After running > > >> gdal_calc.py > > >> with the following parameters > > >> > > >> gdal_calc.py -A test.tif --outfile=testcalc.tif > > >> --calc="(A==249)*255+(A<>249)*A" > > >> > > >> it turns out that all pixel values with 255 are now nodata values ;-( > > >> Is > > >> there an option so that my 255 values are not turned into nodata? I > > >> tested with the --NoDataValue option (e.g. 99 - which I don't use in > > >> the > > >> image), but it seems to be ignored. For me it is important that black > > >> and white pixels are preserved. > > > > > > Use --overwrite as well, since otherwise the existing output file will > > > be used > > > to be just updated and not recreated. > > > It would be appropriate that the utility warns that --NoDataValue has > > > no effect > > > when the output file exists. > > > > > >> Thanks for any hints, > > >> Andreas > > >> _______________________________________________ > > >> gdal-dev mailing list > > >> [email protected] > > >> http://lists.osgeo.org/mailman/listinfo/gdal-dev > > > > -- > Spatialys - Geospatial professional services > http://www.spatialys.com > _______________________________________________ > gdal-dev mailing list > [email protected] > http://lists.osgeo.org/mailman/listinfo/gdal-dev >
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