Hi List,
We've recently taken deliver of some aerial photography.
As lossless GeoTIFFs, the RedGreenBlue data is *278GB*
As a compressed JP2 file the data is *26GB* - the JP2 is almost as good as
the GeoTIFFs and comes with pyramids built in.
But for speed purposes with GeoServer I've created an imageMosaic of 13
Jpeg compressed GeoTIFFs with overviews/tiles etc. This comes out at a
massive *106GB* and the quality is worse than the JP2 file despite being
four times the size.
Can anyone advise how I can improve these files to make them smaller
(ideally with better quality too)? I created each of the GeoTIFFs with the
following two commands
Merge, tile, and compress all at once.
> gdal_merge -q -o file_name.tif -of GTiff -co TILED=YES -co BIGTIFF=YES -co
> COMPRESS=JPEG -co JPEG_QUALITY=50 -co BLOCKXSIZE=512 -co BLOCKYSIZE=512
> --optfile tiff_list.txt
Pyramids
> gdaladdo -r average %THIS_DIR%.tif 2 4 8 16 32 64 128 256
Using JP2 with GDAL is tempting (though supposedly much slower) - but we're
likely to be putting up four band (RGB + Infrared) data, which I think we
can use GeoServer to visualise (still to play with). JP2 can't handle four
bands.
Am I doing something wrong with the GeoTIFF creation?
Thoughts welcome.
Thanks,
Jonathan
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