Matt, Thanks for the link but I already read this page and I have only one process (assign projection information).
Anyway, this is always good to read this information ! List, I successfully assigned my projection information but still have some difference in the file size. This is not so important but I wanted to understand the reason. Idea welcome :) Another question: I have 2 000 ECW files (40 Mo each), 49 ECW files (1 Go each) and 2 ECW files (2 Go each). I worked first on 2 Go ECW file, it takes around 1 day to assign the projection information in the files. Do you think this is normal? How can I improve this? Thanks. Y. Le mardi 30 août 2011 18:46:53, Matt Wilkie a écrit : > Yves, it's best to use gdalwarp without any compression options and > then use gdal_translate as a last step to apply the compression. See > http://trac.osgeo.org/gdal/wiki/UserDocs/GdalWarp#GeoTIFFoutput-coCOMPRESSi > sbroken for more. > > cheers, > > matt wilkie > -------------------------------------------- > Geomatics Analyst > Information Management and Technology > Yukon Department of Environment > 10 Burns Road * Whitehorse, Yukon * Y1A 4Y9 > 867-667-8133 Tel * 867-393-7003 Fax > http://environmentyukon.gov.yk.ca/geomatics/ > -------------------------------------------- > > On 30/08/2011 4:22 AM, Yves Jacolin wrote: > > 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. > > _______________________________________________ > gdal-dev mailing list > [email protected] > http://lists.osgeo.org/mailman/listinfo/gdal-dev -- Yves Jacolin http://yjacolin.gloobe.org _______________________________________________ gdal-dev mailing list [email protected] http://lists.osgeo.org/mailman/listinfo/gdal-dev
