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On 12/05/13 16:21, Ammar wrote:<br>
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<div style="color:#000; background-color:#fff;
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style="color:#000;background-color:#fff;font-family:HelveticaNeue,
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<div style="color:rgb(0,
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Helvetica Neue,
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Grande,
sans-serif;background-color:transparent;font-style:normal;">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!<br
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<div> what I did was:</div>
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sans-serif;background-color:transparent;font-style:normal;">gdal_translate
-a_srs "EPSG:3011" -co
"TILED=YES" -co
"BLOCKXSIZE=512" -co
"BLOCKYSIZE=512" in.tif
out.tif<span
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sans-serif;background-color:transparent;font-style:normal;">gdaladdo
-r average file.tif 2 4
8 16 32<span
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//Adding the overviews</span></div>
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<div style="color:rgb(0,
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class="yiv9098566702tab">gdal_translate -co compress=LZW in.tif out.tif</span></div>
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<div style="color:rgb(0,
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sans-serif;background-color:transparent;font-style:normal;"><span
style="font-weight:bold;"><span class="yiv9098566702tab">After the
compression, I got
the original block
size and with no
overviews!</span></span></div>
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<div style="color:rgb(0,
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sans-serif;background-color:transparent;font-style:normal;"><span
class="yiv9098566702tab">Any ideas, thoughts or tips will be
appreciated.</span></div>
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<br>
Hello Ammar,<br>
<br>
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.<br>
<br>
Best,<br>
Vincent Schut.<br>
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class="yiv9098566702tab">//Ammar<br clear="none">
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