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On 12/05/13 16:39, Vincent Schut wrote:<br>
<blockquote cite="mid:52A09E16.9070105@sarvision.nl" type="cite">
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On 12/05/13 16:21, Ammar wrote:<br>
<blockquote
cite="mid:1386256870.1521.YahooMailNeo@web163004.mail.bf1.yahoo.com"
type="cite">
<div style="color:#000; background-color:#fff;
font-family:HelveticaNeue, Helvetica Neue, Helvetica, Arial,
Lucida Grande, sans-serif;font-size:12pt">Hello list,
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12pt;">
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id="yiv9098566702yqtfd63070">
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style="color:#000;background-color:#fff;font-family:HelveticaNeue,
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style="color:#000;background-color:#fff;font-family:HelveticaNeue,
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Lucida Grande,
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style="font-family:HelveticaNeue,
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Lucida Grande,
sans-serif;font-size:12pt;">
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style="font-family:HelveticaNeue,
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Arial, Lucida Grande,
sans-serif;font-size:12pt;">
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class="yiv9098566702y_msg_container">
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<div
style="color:#000;background-color:#fff;font-family:HelveticaNeue,
Helvetica Neue,
Helvetica, Arial, Lucida
Grande,
sans-serif;font-size:12pt;">
<div><br clear="none">
</div>
<div style="color:rgb(0,
0,
0);font-size:16px;font-family:HelveticaNeue,
Helvetica Neue,
Helvetica, Arial,
Lucida 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
clear="none">
</div>
<div> what I did was:</div>
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</div>
<div style="color:rgb(0,
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0);font-size:16px;font-family:HelveticaNeue,
Helvetica Neue,
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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
class="yiv9098566702tab">
</span><br
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clear="none">
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<div style="color:rgb(0,
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0);font-size:16px;font-family:HelveticaNeue,
Helvetica Neue,
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sans-serif;background-color:transparent;font-style:normal;">gdaladdo
-r average file.tif 2
4 8 16 32<span
class="yiv9098566702tab">
//Adding the
overviews</span></div>
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sans-serif;background-color:transparent;font-style:normal;"><br
clear="none">
<span
class="yiv9098566702tab"></span></div>
<div style="color:rgb(0,
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Helvetica Neue,
Helvetica, Arial,
Lucida Grande,
sans-serif;background-color:transparent;font-style:normal;"><span
class="yiv9098566702tab">gdal_translate -co compress=LZW in.tif out.tif</span></div>
<div style="color:rgb(0,
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0);font-size:16px;font-family:HelveticaNeue,
Helvetica Neue,
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Lucida Grande,
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clear="none">
<span
class="yiv9098566702tab"></span></div>
<div style="color:rgb(0,
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0);font-size:16px;font-family:HelveticaNeue,
Helvetica Neue,
Helvetica, Arial,
Lucida Grande,
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>
<div style="color:rgb(0,
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0);font-size:16px;font-family:HelveticaNeue,
Helvetica Neue,
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Lucida Grande,
sans-serif;background-color:transparent;font-style:normal;"><br
clear="none">
<span
class="yiv9098566702tab"></span></div>
<div style="color:rgb(0,
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Helvetica Neue,
Helvetica, Arial,
Lucida Grande,
sans-serif;background-color:transparent;font-style:normal;"><span
class="yiv9098566702tab">Any ideas, thoughts or tips will be
appreciated.</span></div>
</div>
</div>
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</blockquote>
<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>
</blockquote>
<br>
Correction: that should of course read: "So your last gdal_translate
command effectively removes all tiling and overviews, while adding
lzw compression."<br>
<blockquote cite="mid:52A09E16.9070105@sarvision.nl" type="cite">
<blockquote
cite="mid:1386256870.1521.YahooMailNeo@web163004.mail.bf1.yahoo.com"
type="cite">
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<div style="color:rgb(0,
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class="yiv9098566702tab"></span></div>
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class="yiv9098566702tab">//Ammar<br clear="none">
</span></div>
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