Etienne, Ah yes I understand :)
Actually I tested geotifcp to add projection information in the geotiff file but I had some problem. Since I have ECW files also I moved to gdal utilities. Merci ! Y. Le mardi 30 août 2011 15:09:13, Etienne Tourigny a écrit : > Bonjour Yves, > > > I think that gdalwarp is not optimized for saving compressed geotiffs, you > would have to do that in a second step. This topic has been addressed in > this list not long ago. > > > Anyway, you should be using gdal_translate (with a_srs flag) instead for > this task, as you are just adding georeferencing information, not > re-projecting the data. > > something like gdal_translate -co "COMPRESS=PACKBITS" -co > "PHOTOMETRIC=MINISWHITE" -co "NBITS=1" -a_srs "EPSG:2154" input.tif > output.tif > > Etienne > > > > ----- Original Message ----- > From: Yves Jacolin <[email protected]> > To: gdal-dev <[email protected]> > Cc: > Sent: Tuesday, August 30, 2011 8:22:46 AM > Subject: [gdal-dev] GTiff optimisation > > Hello, > > I am converting GTiff to GTiff in order to add projection and > georeferencing information in the header. I am using gdalwarp with some > flags, mailny -co flags. I have some question about this. > > Here is my command line: > > gdalwarp -co "COMPRESS=PACKBITS" -co "PHOTOMETRIC=MINISWHITE" -co "NBITS=1" > - s_srs "EPSG:2154" -t_srs "EPSG:2154" input.tif output.tif > > 1. File size: input.tif and output.tif have different file size, output > file is 50 % bigger than the input file. Is it normal? > > 2. If I use gdalinfo on my output file, I have no information about > MINISWHITE parameter while I have it in the input file. Am I using this > creation option correctly? This issue could be related to the first item? > > 3. I also have a "AREA_OR_POINT=Area" item in my output from gdalinfo, what > does it means? > > gdal version: GDAL 1.7.3, released 2010/11/10 > > thanks, > > Y. -- Yves Jacolin http://yjacolin.gloobe.org _______________________________________________ gdal-dev mailing list [email protected] http://lists.osgeo.org/mailman/listinfo/gdal-dev
