On 12/05/13 16:39, Vincent Schut wrote:
On 12/05/13 16:21, Ammar wrote:
Hello list,
I am new to GDAL and I have been using the utilities to process and
prepare TIFF to create a mosaic in Geoserver. I am expermineting
with different compression methods and I have noticed that after
compressing a file with LZW, the previously created tiles and
overviews disappear!
what I did was:
gdal_translate -a_srs "EPSG:3011" -co "TILED=YES" -co
"BLOCKXSIZE=512" -co "BLOCKYSIZE=512" in.tif out.tif
gdaladdo -r average file.tif 2 4 8 16 32//Adding the overviews
gdal_translate -co compress=LZW in.tif out.tif
After the compression, I got the original block size and with no
overviews!
Any ideas, thoughts or tips will be appreciated.
Hello Ammar,
the default for gdal_translate is no tiling, no compression, and don't
copy overviews. So your last gdal_translate command effectively
removes all tiling, overviews and compression. If you want to have a
tiled and compressed file, add the '-co compress=lzw" to your first
gdal_translate command, which will create a tiled and compressed
'out.tif'. Then add overviews to that with gdaladdo. If I'm not
mistaken, the overviews use the settings from the main dataset, so
would also use lzw compression.
Best,
Vincent Schut.
Correction: that should of course read: "So your last gdal_translate
command effectively removes all tiling and overviews, while adding lzw
compression."
//Ammar
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