[gdal-dev] GTiff optimisation

Yves Jacolin yjacolin at free.fr
Tue Aug 30 07:22:46 EDT 2011


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:

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


Yves Jacolin


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