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<p class="MsoNormal"><span style="font-family:"Arial",sans-serif;color:#1F497D;mso-fareast-language:EN-US">Oh that’s so weird. Well that puts my take-away as: just use Level=17 and forget the rest exist!<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-family:"Arial",sans-serif;color:#1F497D;mso-fareast-language:EN-US"><o:p> </o:p></span></p>
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<p class="MsoNormal"><span lang="EN-US" style="font-size:11.0pt;font-family:"Arial",sans-serif;color:#1F497D">-Matt<o:p></o:p></span></p>
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<p class="MsoNormal"><b><span lang="EN-US" style="font-size:11.0pt">From:</span></b><span lang="EN-US" style="font-size:11.0pt"> Daniel Evans <Daniel.Evans@jbarisk.com>
<br>
<b>Sent:</b> March 15, 2021 2:36 AM<br>
<b>To:</b> Matt.Wilkie <Matt.Wilkie@yukon.ca>; gdal-dev@lists.osgeo.org<br>
<b>Subject:</b> RE: ZSTD compression level 17 smaller than 18+?<o:p></o:p></span></p>
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<p class="MsoNormal"><o:p> </o:p></p>
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<pre><strong><span style="font-family:"Courier New";color:black">*** External email: Do not click on links or attachments except from trusted senders. ***<o:p></o:p></span></strong></pre>
<pre><strong><span style="font-family:"Courier New";color:black">******************************************************************************************</span></strong><span style="color:black"><o:p></o:p></span></pre>
<pre><span style="color:black"><br><br><o:p></o:p></span></pre>
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<p class="MsoNormal"><span lang="EN-GB" style="font-size:11.0pt;font-family:"Arial",sans-serif;mso-fareast-language:EN-US">I don’t think it’s particularly unusual for any compression algorithm to have this sort of behaviour once it’s “maxed out”.<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-GB" style="font-size:11.0pt;font-family:"Arial",sans-serif;mso-fareast-language:EN-US"><o:p> </o:p></span></p>
<p class="MsoNormal"><span lang="EN-GB" style="font-size:11.0pt;font-family:"Arial",sans-serif;mso-fareast-language:EN-US">Running the in-built zstd benchmarks from the command line without any custom parameters – so entirely separate of how GDAL uses it –
it shows your observed behaviour to an even greater extent, with most levels doing worse than level 1!<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-GB" style="font-size:11.0pt;font-family:"Arial",sans-serif;mso-fareast-language:EN-US"><o:p> </o:p></span></p>
<table class="MsoNormalTable" border="0" cellspacing="0" cellpadding="0" width="0" style="width:156.0pt;border-collapse:collapse">
<tbody>
<tr style="height:15.0pt">
<td width="64" nowrap="" valign="bottom" style="width:48.0pt;padding:0cm 5.4pt 0cm 5.4pt;height:15.0pt">
<p class="MsoNormal"><span style="font-size:11.0pt;color:black">Level<o:p></o:p></span></p>
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<td width="67" nowrap="" valign="bottom" style="width:48.0pt;padding:0cm 5.4pt 0cm 5.4pt;height:15.0pt">
<p class="MsoNormal"><span style="font-size:11.0pt;color:black">Size<o:p></o:p></span></p>
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<td width="80" nowrap="" valign="bottom" style="width:60.0pt;padding:0cm 5.4pt 0cm 5.4pt;height:15.0pt">
<p class="MsoNormal"><span style="font-size:11.0pt;color:black">% Smaller than Level 1<o:p></o:p></span></p>
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<td width="64" nowrap="" valign="bottom" style="width:48.0pt;padding:0cm 5.4pt 0cm 5.4pt;height:15.0pt">
<p class="MsoNormal" align="right" style="text-align:right"><span style="font-size:11.0pt;color:black">1<o:p></o:p></span></p>
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<td width="67" nowrap="" valign="bottom" style="width:48.0pt;padding:0cm 5.4pt 0cm 5.4pt;height:15.0pt">
<p class="MsoNormal" align="right" style="text-align:right"><span style="font-size:11.0pt;color:black">3154783<o:p></o:p></span></p>
</td>
<td width="80" nowrap="" valign="bottom" style="width:60.0pt;padding:0cm 5.4pt 0cm 5.4pt;height:15.0pt">
<p class="MsoNormal" align="right" style="text-align:right"><span style="font-size:11.0pt;color:black">0.00%<o:p></o:p></span></p>
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<tr style="height:15.0pt">
<td width="64" nowrap="" valign="bottom" style="width:48.0pt;padding:0cm 5.4pt 0cm 5.4pt;height:15.0pt">
<p class="MsoNormal" align="right" style="text-align:right"><span style="font-size:11.0pt;color:black">2<o:p></o:p></span></p>
</td>
<td width="67" nowrap="" valign="bottom" style="width:48.0pt;padding:0cm 5.4pt 0cm 5.4pt;height:15.0pt">
<p class="MsoNormal" align="right" style="text-align:right"><span style="font-size:11.0pt;color:black">3130807<o:p></o:p></span></p>
</td>
<td width="80" nowrap="" valign="bottom" style="width:60.0pt;padding:0cm 5.4pt 0cm 5.4pt;height:15.0pt">
<p class="MsoNormal" align="right" style="text-align:right"><span style="font-size:11.0pt;color:black">0.76%<o:p></o:p></span></p>
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</tr>
<tr style="height:15.0pt">
<td width="64" nowrap="" valign="bottom" style="width:48.0pt;padding:0cm 5.4pt 0cm 5.4pt;height:15.0pt">
<p class="MsoNormal" align="right" style="text-align:right"><span style="font-size:11.0pt;color:black">3<o:p></o:p></span></p>
</td>
<td width="67" nowrap="" valign="bottom" style="width:48.0pt;padding:0cm 5.4pt 0cm 5.4pt;height:15.0pt">
<p class="MsoNormal" align="right" style="text-align:right"><span style="font-size:11.0pt;color:black">3231415<o:p></o:p></span></p>
</td>
<td width="80" nowrap="" valign="bottom" style="width:60.0pt;padding:0cm 5.4pt 0cm 5.4pt;height:15.0pt">
<p class="MsoNormal" align="right" style="text-align:right"><span style="font-size:11.0pt;color:black">-2.43%<o:p></o:p></span></p>
</td>
</tr>
<tr style="height:15.0pt">
<td width="64" nowrap="" valign="bottom" style="width:48.0pt;padding:0cm 5.4pt 0cm 5.4pt;height:15.0pt">
<p class="MsoNormal" align="right" style="text-align:right"><span style="font-size:11.0pt;color:black">4<o:p></o:p></span></p>
</td>
<td width="67" nowrap="" valign="bottom" style="width:48.0pt;padding:0cm 5.4pt 0cm 5.4pt;height:15.0pt">
<p class="MsoNormal" align="right" style="text-align:right"><span style="font-size:11.0pt;color:black">3346308<o:p></o:p></span></p>
</td>
<td width="80" nowrap="" valign="bottom" style="width:60.0pt;padding:0cm 5.4pt 0cm 5.4pt;height:15.0pt">
<p class="MsoNormal" align="right" style="text-align:right"><span style="font-size:11.0pt;color:black">-6.07%<o:p></o:p></span></p>
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<tr style="height:15.0pt">
<td width="64" nowrap="" valign="bottom" style="width:48.0pt;padding:0cm 5.4pt 0cm 5.4pt;height:15.0pt">
<p class="MsoNormal" align="right" style="text-align:right"><span style="font-size:11.0pt;color:black">5<o:p></o:p></span></p>
</td>
<td width="67" nowrap="" valign="bottom" style="width:48.0pt;padding:0cm 5.4pt 0cm 5.4pt;height:15.0pt">
<p class="MsoNormal" align="right" style="text-align:right"><span style="font-size:11.0pt;color:black">3335646<o:p></o:p></span></p>
</td>
<td width="80" nowrap="" valign="bottom" style="width:60.0pt;padding:0cm 5.4pt 0cm 5.4pt;height:15.0pt">
<p class="MsoNormal" align="right" style="text-align:right"><span style="font-size:11.0pt;color:black">-5.73%<o:p></o:p></span></p>
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</tr>
<tr style="height:15.0pt">
<td width="64" nowrap="" valign="bottom" style="width:48.0pt;padding:0cm 5.4pt 0cm 5.4pt;height:15.0pt">
<p class="MsoNormal" align="right" style="text-align:right"><span style="font-size:11.0pt;color:black">6<o:p></o:p></span></p>
</td>
<td width="67" nowrap="" valign="bottom" style="width:48.0pt;padding:0cm 5.4pt 0cm 5.4pt;height:15.0pt">
<p class="MsoNormal" align="right" style="text-align:right"><span style="font-size:11.0pt;color:black">3340284<o:p></o:p></span></p>
</td>
<td width="80" nowrap="" valign="bottom" style="width:60.0pt;padding:0cm 5.4pt 0cm 5.4pt;height:15.0pt">
<p class="MsoNormal" align="right" style="text-align:right"><span style="font-size:11.0pt;color:black">-5.88%<o:p></o:p></span></p>
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</tr>
<tr style="height:15.0pt">
<td width="64" nowrap="" valign="bottom" style="width:48.0pt;padding:0cm 5.4pt 0cm 5.4pt;height:15.0pt">
<p class="MsoNormal" align="right" style="text-align:right"><span style="font-size:11.0pt;color:black">7<o:p></o:p></span></p>
</td>
<td width="67" nowrap="" valign="bottom" style="width:48.0pt;padding:0cm 5.4pt 0cm 5.4pt;height:15.0pt">
<p class="MsoNormal" align="right" style="text-align:right"><span style="font-size:11.0pt;color:black">3324298<o:p></o:p></span></p>
</td>
<td width="80" nowrap="" valign="bottom" style="width:60.0pt;padding:0cm 5.4pt 0cm 5.4pt;height:15.0pt">
<p class="MsoNormal" align="right" style="text-align:right"><span style="font-size:11.0pt;color:black">-5.37%<o:p></o:p></span></p>
</td>
</tr>
<tr style="height:15.0pt">
<td width="64" nowrap="" valign="bottom" style="width:48.0pt;padding:0cm 5.4pt 0cm 5.4pt;height:15.0pt">
<p class="MsoNormal" align="right" style="text-align:right"><span style="font-size:11.0pt;color:black">8<o:p></o:p></span></p>
</td>
<td width="67" nowrap="" valign="bottom" style="width:48.0pt;padding:0cm 5.4pt 0cm 5.4pt;height:15.0pt">
<p class="MsoNormal" align="right" style="text-align:right"><span style="font-size:11.0pt;color:black">3315170<o:p></o:p></span></p>
</td>
<td width="80" nowrap="" valign="bottom" style="width:60.0pt;padding:0cm 5.4pt 0cm 5.4pt;height:15.0pt">
<p class="MsoNormal" align="right" style="text-align:right"><span style="font-size:11.0pt;color:black">-5.08%<o:p></o:p></span></p>
</td>
</tr>
<tr style="height:15.0pt">
<td width="64" nowrap="" valign="bottom" style="width:48.0pt;padding:0cm 5.4pt 0cm 5.4pt;height:15.0pt">
<p class="MsoNormal" align="right" style="text-align:right"><span style="font-size:11.0pt;color:black">9<o:p></o:p></span></p>
</td>
<td width="67" nowrap="" valign="bottom" style="width:48.0pt;padding:0cm 5.4pt 0cm 5.4pt;height:15.0pt">
<p class="MsoNormal" align="right" style="text-align:right"><span style="font-size:11.0pt;color:black">3321085<o:p></o:p></span></p>
</td>
<td width="80" nowrap="" valign="bottom" style="width:60.0pt;padding:0cm 5.4pt 0cm 5.4pt;height:15.0pt">
<p class="MsoNormal" align="right" style="text-align:right"><span style="font-size:11.0pt;color:black">-5.27%<o:p></o:p></span></p>
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</tr>
<tr style="height:15.0pt">
<td width="64" nowrap="" valign="bottom" style="width:48.0pt;padding:0cm 5.4pt 0cm 5.4pt;height:15.0pt">
<p class="MsoNormal" align="right" style="text-align:right"><span style="font-size:11.0pt;color:black">10<o:p></o:p></span></p>
</td>
<td width="67" nowrap="" valign="bottom" style="width:48.0pt;padding:0cm 5.4pt 0cm 5.4pt;height:15.0pt">
<p class="MsoNormal" align="right" style="text-align:right"><span style="font-size:11.0pt;color:black">3355473<o:p></o:p></span></p>
</td>
<td width="80" nowrap="" valign="bottom" style="width:60.0pt;padding:0cm 5.4pt 0cm 5.4pt;height:15.0pt">
<p class="MsoNormal" align="right" style="text-align:right"><span style="font-size:11.0pt;color:black">-6.36%<o:p></o:p></span></p>
</td>
</tr>
<tr style="height:15.0pt">
<td width="64" nowrap="" valign="bottom" style="width:48.0pt;padding:0cm 5.4pt 0cm 5.4pt;height:15.0pt">
<p class="MsoNormal" align="right" style="text-align:right"><span style="font-size:11.0pt;color:black">11<o:p></o:p></span></p>
</td>
<td width="67" nowrap="" valign="bottom" style="width:48.0pt;padding:0cm 5.4pt 0cm 5.4pt;height:15.0pt">
<p class="MsoNormal" align="right" style="text-align:right"><span style="font-size:11.0pt;color:black">3355932<o:p></o:p></span></p>
</td>
<td width="80" nowrap="" valign="bottom" style="width:60.0pt;padding:0cm 5.4pt 0cm 5.4pt;height:15.0pt">
<p class="MsoNormal" align="right" style="text-align:right"><span style="font-size:11.0pt;color:black">-6.38%<o:p></o:p></span></p>
</td>
</tr>
<tr style="height:15.0pt">
<td width="64" nowrap="" valign="bottom" style="width:48.0pt;padding:0cm 5.4pt 0cm 5.4pt;height:15.0pt">
<p class="MsoNormal" align="right" style="text-align:right"><span style="font-size:11.0pt;color:black">12<o:p></o:p></span></p>
</td>
<td width="67" nowrap="" valign="bottom" style="width:48.0pt;padding:0cm 5.4pt 0cm 5.4pt;height:15.0pt">
<p class="MsoNormal" align="right" style="text-align:right"><span style="font-size:11.0pt;color:black">3355857<o:p></o:p></span></p>
</td>
<td width="80" nowrap="" valign="bottom" style="width:60.0pt;padding:0cm 5.4pt 0cm 5.4pt;height:15.0pt">
<p class="MsoNormal" align="right" style="text-align:right"><span style="font-size:11.0pt;color:black">-6.37%<o:p></o:p></span></p>
</td>
</tr>
<tr style="height:15.0pt">
<td width="64" nowrap="" valign="bottom" style="width:48.0pt;padding:0cm 5.4pt 0cm 5.4pt;height:15.0pt">
<p class="MsoNormal" align="right" style="text-align:right"><span style="font-size:11.0pt;color:black">13<o:p></o:p></span></p>
</td>
<td width="67" nowrap="" valign="bottom" style="width:48.0pt;padding:0cm 5.4pt 0cm 5.4pt;height:15.0pt">
<p class="MsoNormal" align="right" style="text-align:right"><span style="font-size:11.0pt;color:black">3355401<o:p></o:p></span></p>
</td>
<td width="80" nowrap="" valign="bottom" style="width:60.0pt;padding:0cm 5.4pt 0cm 5.4pt;height:15.0pt">
<p class="MsoNormal" align="right" style="text-align:right"><span style="font-size:11.0pt;color:black">-6.36%<o:p></o:p></span></p>
</td>
</tr>
<tr style="height:15.0pt">
<td width="64" nowrap="" valign="bottom" style="width:48.0pt;padding:0cm 5.4pt 0cm 5.4pt;height:15.0pt">
<p class="MsoNormal" align="right" style="text-align:right"><span style="font-size:11.0pt;color:black">14<o:p></o:p></span></p>
</td>
<td width="67" nowrap="" valign="bottom" style="width:48.0pt;padding:0cm 5.4pt 0cm 5.4pt;height:15.0pt">
<p class="MsoNormal" align="right" style="text-align:right"><span style="font-size:11.0pt;color:black">3354678<o:p></o:p></span></p>
</td>
<td width="80" nowrap="" valign="bottom" style="width:60.0pt;padding:0cm 5.4pt 0cm 5.4pt;height:15.0pt">
<p class="MsoNormal" align="right" style="text-align:right"><span style="font-size:11.0pt;color:black">-6.34%<o:p></o:p></span></p>
</td>
</tr>
<tr style="height:15.0pt">
<td width="64" nowrap="" valign="bottom" style="width:48.0pt;padding:0cm 5.4pt 0cm 5.4pt;height:15.0pt">
<p class="MsoNormal" align="right" style="text-align:right"><span style="font-size:11.0pt;color:black">15<o:p></o:p></span></p>
</td>
<td width="67" nowrap="" valign="bottom" style="width:48.0pt;padding:0cm 5.4pt 0cm 5.4pt;height:15.0pt">
<p class="MsoNormal" align="right" style="text-align:right"><span style="font-size:11.0pt;color:black">3353801<o:p></o:p></span></p>
</td>
<td width="80" nowrap="" valign="bottom" style="width:60.0pt;padding:0cm 5.4pt 0cm 5.4pt;height:15.0pt">
<p class="MsoNormal" align="right" style="text-align:right"><span style="font-size:11.0pt;color:black">-6.31%<o:p></o:p></span></p>
</td>
</tr>
<tr style="height:15.0pt">
<td width="64" nowrap="" valign="bottom" style="width:48.0pt;padding:0cm 5.4pt 0cm 5.4pt;height:15.0pt">
<p class="MsoNormal" align="right" style="text-align:right"><span style="font-size:11.0pt;color:black">16<o:p></o:p></span></p>
</td>
<td width="67" nowrap="" valign="bottom" style="width:48.0pt;padding:0cm 5.4pt 0cm 5.4pt;height:15.0pt">
<p class="MsoNormal" align="right" style="text-align:right"><span style="font-size:11.0pt;color:black">3083731<o:p></o:p></span></p>
</td>
<td width="80" nowrap="" valign="bottom" style="width:60.0pt;padding:0cm 5.4pt 0cm 5.4pt;height:15.0pt">
<p class="MsoNormal" align="right" style="text-align:right"><span style="font-size:11.0pt;color:black">2.25%<o:p></o:p></span></p>
</td>
</tr>
<tr style="height:15.0pt">
<td width="64" nowrap="" valign="bottom" style="width:48.0pt;padding:0cm 5.4pt 0cm 5.4pt;height:15.0pt">
<p class="MsoNormal" align="right" style="text-align:right"><span style="font-size:11.0pt;color:black">17<o:p></o:p></span></p>
</td>
<td width="67" nowrap="" valign="bottom" style="width:48.0pt;padding:0cm 5.4pt 0cm 5.4pt;height:15.0pt">
<p class="MsoNormal" align="right" style="text-align:right"><span style="font-size:11.0pt;color:black">3142331<o:p></o:p></span></p>
</td>
<td width="80" nowrap="" valign="bottom" style="width:60.0pt;padding:0cm 5.4pt 0cm 5.4pt;height:15.0pt">
<p class="MsoNormal" align="right" style="text-align:right"><span style="font-size:11.0pt;color:black">0.39%<o:p></o:p></span></p>
</td>
</tr>
<tr style="height:15.0pt">
<td width="64" nowrap="" valign="bottom" style="width:48.0pt;padding:0cm 5.4pt 0cm 5.4pt;height:15.0pt">
<p class="MsoNormal" align="right" style="text-align:right"><span style="font-size:11.0pt;color:black">18<o:p></o:p></span></p>
</td>
<td width="67" nowrap="" valign="bottom" style="width:48.0pt;padding:0cm 5.4pt 0cm 5.4pt;height:15.0pt">
<p class="MsoNormal" align="right" style="text-align:right"><span style="font-size:11.0pt;color:black">3147466<o:p></o:p></span></p>
</td>
<td width="80" nowrap="" valign="bottom" style="width:60.0pt;padding:0cm 5.4pt 0cm 5.4pt;height:15.0pt">
<p class="MsoNormal" align="right" style="text-align:right"><span style="font-size:11.0pt;color:black">0.23%<o:p></o:p></span></p>
</td>
</tr>
<tr style="height:15.0pt">
<td width="64" nowrap="" valign="bottom" style="width:48.0pt;padding:0cm 5.4pt 0cm 5.4pt;height:15.0pt">
<p class="MsoNormal" align="right" style="text-align:right"><span style="font-size:11.0pt;color:black">19<o:p></o:p></span></p>
</td>
<td width="67" nowrap="" valign="bottom" style="width:48.0pt;padding:0cm 5.4pt 0cm 5.4pt;height:15.0pt">
<p class="MsoNormal" align="right" style="text-align:right"><span style="font-size:11.0pt;color:black">3146084<o:p></o:p></span></p>
</td>
<td width="80" nowrap="" valign="bottom" style="width:60.0pt;padding:0cm 5.4pt 0cm 5.4pt;height:15.0pt">
<p class="MsoNormal" align="right" style="text-align:right"><span style="font-size:11.0pt;color:black">0.28%<o:p></o:p></span></p>
</td>
</tr>
<tr style="height:15.0pt">
<td width="64" nowrap="" valign="bottom" style="width:48.0pt;padding:0cm 5.4pt 0cm 5.4pt;height:15.0pt">
<p class="MsoNormal" align="right" style="text-align:right"><span style="font-size:11.0pt;color:black">20<o:p></o:p></span></p>
</td>
<td width="67" nowrap="" valign="bottom" style="width:48.0pt;padding:0cm 5.4pt 0cm 5.4pt;height:15.0pt">
<p class="MsoNormal" align="right" style="text-align:right"><span style="font-size:11.0pt;color:black">3146548<o:p></o:p></span></p>
</td>
<td width="80" nowrap="" valign="bottom" style="width:60.0pt;padding:0cm 5.4pt 0cm 5.4pt;height:15.0pt">
<p class="MsoNormal" align="right" style="text-align:right"><span style="font-size:11.0pt;color:black">0.26%<o:p></o:p></span></p>
</td>
</tr>
<tr style="height:15.0pt">
<td width="64" nowrap="" valign="bottom" style="width:48.0pt;padding:0cm 5.4pt 0cm 5.4pt;height:15.0pt">
<p class="MsoNormal" align="right" style="text-align:right"><span style="font-size:11.0pt;color:black">21<o:p></o:p></span></p>
</td>
<td width="67" nowrap="" valign="bottom" style="width:48.0pt;padding:0cm 5.4pt 0cm 5.4pt;height:15.0pt">
<p class="MsoNormal" align="right" style="text-align:right"><span style="font-size:11.0pt;color:black">3145580<o:p></o:p></span></p>
</td>
<td width="80" nowrap="" valign="bottom" style="width:60.0pt;padding:0cm 5.4pt 0cm 5.4pt;height:15.0pt">
<p class="MsoNormal" align="right" style="text-align:right"><span style="font-size:11.0pt;color:black">0.29%<o:p></o:p></span></p>
</td>
</tr>
<tr style="height:15.0pt">
<td width="64" nowrap="" valign="bottom" style="width:48.0pt;padding:0cm 5.4pt 0cm 5.4pt;height:15.0pt">
<p class="MsoNormal" align="right" style="text-align:right"><span style="font-size:11.0pt;color:black">22<o:p></o:p></span></p>
</td>
<td width="67" nowrap="" valign="bottom" style="width:48.0pt;padding:0cm 5.4pt 0cm 5.4pt;height:15.0pt">
<p class="MsoNormal" align="right" style="text-align:right"><span style="font-size:11.0pt;color:black">3142972<o:p></o:p></span></p>
</td>
<td width="80" nowrap="" valign="bottom" style="width:60.0pt;padding:0cm 5.4pt 0cm 5.4pt;height:15.0pt">
<p class="MsoNormal" align="right" style="text-align:right"><span style="font-size:11.0pt;color:black">0.37%<o:p></o:p></span></p>
</td>
</tr>
</tbody>
</table>
<p class="MsoNormal"><span lang="EN-GB" style="font-size:11.0pt;font-family:"Arial",sans-serif;mso-fareast-language:EN-US"><o:p> </o:p></span></p>
<p class="MsoNormal"><span lang="EN-GB" style="font-size:11.0pt;font-family:"Arial",sans-serif;mso-fareast-language:EN-US">Table generated from output of `zstd -b1 -e22`, “zstd command line interface 64-bits v1.4.7”.<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-GB" style="font-size:11.0pt;font-family:"Arial",sans-serif;mso-fareast-language:EN-US"><o:p> </o:p></span></p>
<p class="MsoNormal"><span lang="EN-GB" style="font-size:11.0pt;font-family:"Arial",sans-serif;mso-fareast-language:EN-US"><o:p> </o:p></span></p>
<div>
<p class="MsoNormal"><b><span lang="EN-GB" style="font-size:11.0pt;font-family:"Arial",sans-serif;color:black">Dr Daniel Evans<o:p></o:p></span></b></p>
<p class="MsoNormal"><span lang="EN-GB" style="font-size:11.0pt;font-family:"Arial",sans-serif;color:#F6A124">Software Developer<o:p></o:p></span></p>
</div>
<p class="MsoNormal"><span lang="EN-GB" style="font-size:11.0pt;font-family:"Arial",sans-serif;mso-fareast-language:EN-US"><o:p> </o:p></span></p>
<div>
<div style="border:none;border-top:solid #E1E1E1 1.0pt;padding:3.0pt 0cm 0cm 0cm">
<p class="MsoNormal"><b><span lang="EN-US" style="font-size:11.0pt">From:</span></b><span lang="EN-US" style="font-size:11.0pt"> gdal-dev <<a href="mailto:gdal-dev-bounces@lists.osgeo.org">gdal-dev-bounces@lists.osgeo.org</a>>
<b>On Behalf Of </b><a href="mailto:Matt.Wilkie@yukon.ca">Matt.Wilkie@yukon.ca</a><br>
<b>Sent:</b> 15 March 2021 04:04<br>
<b>To:</b> <a href="mailto:gdal-dev@lists.osgeo.org">gdal-dev@lists.osgeo.org</a><br>
<b>Subject:</b> [gdal-dev] ZSTD compression level 17 smaller than 18+?<o:p></o:p></span></p>
</div>
</div>
<p class="MsoNormal"><span lang="EN-GB" style="font-size:11.0pt"><o:p> </o:p></span></p>
<div>
<p class="MsoNormal"><span lang="EN-GB" style="font-family:"Arial",sans-serif;color:black">So this is curious: output to Cloud optimized Geotiff with ZSTD compression to Level 17 is smaller than levels 18-22. Or at least that's my results when testing compression
results with Gdal 3.1 via Qgis 3.18 on Windows 10. I expected compression levels to get smaller with higher levels, at expense of longer and longer computation time. Levels 1 to 16 do that. Even more curious than 17 being the smallest of the lot is that each
step 18 to 22 is progressively larger, albeit by a miniscule amount.<o:p></o:p></span></p>
</div>
<div>
<p class="MsoNormal"><span lang="EN-GB" style="font-family:"Arial",sans-serif;color:black"><o:p> </o:p></span></p>
</div>
<div>
<p class="MsoNormal"><span lang="EN-GB" style="font-family:"Arial",sans-serif;color:black">Here's my results:<o:p></o:p></span></p>
</div>
<div>
<p class="MsoNormal"><span lang="EN-GB" style="font-family:"Arial",sans-serif;color:black"><o:p> </o:p></span></p>
</div>
<div>
<table class="MsoNormalTable" border="0" cellspacing="0" cellpadding="0" width="0" style="width:427.0pt;border-collapse:collapse">
<tbody>
<tr style="height:28.8pt">
<td width="79" style="width:61.0pt;border-top:solid black 1.0pt;border-left:none;border-bottom:solid black 1.0pt;border-right:none;padding:0cm 0cm 0cm 0cm;height:28.8pt">
<p class="MsoNormal"><b><span style="font-size:11.0pt">% smaller than biggest<o:p></o:p></span></b></p>
</td>
<td width="92" style="width:70.0pt;border-top:solid black 1.0pt;border-left:none;border-bottom:solid black 1.0pt;border-right:none;padding:0cm 0cm 0cm 0cm;height:28.8pt">
<p class="MsoNormal"><b><span style="font-size:11.0pt">Bytes<o:p></o:p></span></b></p>
</td>
<td width="194" style="width:152.0pt;border-top:solid black 1.0pt;border-left:none;border-bottom:solid black 1.0pt;border-right:none;padding:0cm 0cm 0cm 0cm;height:28.8pt">
<p class="MsoNormal"><b><span style="font-size:11.0pt">Filename<o:p></o:p></span></b></p>
</td>
<td width="79" style="width:48.0pt;border-top:solid black 1.0pt;border-left:none;border-bottom:solid black 1.0pt;border-right:none;padding:0cm 0cm 0cm 0cm;height:28.8pt">
<p class="MsoNormal"><b><span style="font-size:11.0pt">Compression<o:p></o:p></span></b></p>
</td>
<td width="64" style="width:48.0pt;border-top:solid black 1.0pt;border-left:none;border-bottom:solid black 1.0pt;border-right:none;padding:0cm 0cm 0cm 0cm;height:28.8pt">
<p class="MsoNormal"><b><span style="font-size:11.0pt">Predictor<o:p></o:p></span></b></p>
</td>
<td width="62" style="width:48.0pt;border-top:solid black 1.0pt;border-left:none;border-bottom:solid black 1.0pt;border-right:none;padding:0cm 0cm 0cm 0cm;height:28.8pt">
<p class="MsoNormal"><b><span style="font-size:11.0pt">Level<o:p></o:p></span></b></p>
</td>
</tr>
<tr style="height:14.4pt">
<td style="padding:0cm 0cm 0cm 0cm;height:14.4pt">
<p class="MsoNormal" align="right" style="text-align:right"><span style="font-size:11.0pt">24.2%<o:p></o:p></span></p>
</td>
<td style="padding:0cm 0cm 0cm 0cm;height:14.4pt">
<p class="MsoNormal" align="right" style="text-align:right"><span style="font-size:11.0pt">200,968,821<o:p></o:p></span></p>
</td>
<td style="padding:0cm 0cm 0cm 0cm;height:14.4pt">
<p class="MsoNormal"><span style="font-size:11.0pt">cog-zstd-pyes-lev17.tif<o:p></o:p></span></p>
</td>
<td style="padding:0cm 0cm 0cm 0cm;height:14.4pt">
<p class="MsoNormal"><span style="font-size:11.0pt">zstd<o:p></o:p></span></p>
</td>
<td style="padding:0cm 0cm 0cm 0cm;height:14.4pt">
<p class="MsoNormal"><span style="font-size:11.0pt">yes<o:p></o:p></span></p>
</td>
<td style="padding:0cm 0cm 0cm 0cm;height:14.4pt">
<p class="MsoNormal" align="right" style="text-align:right"><span style="font-size:11.0pt">17<o:p></o:p></span></p>
</td>
</tr>
<tr style="height:14.4pt">
<td style="padding:0cm 0cm 0cm 0cm;height:14.4pt">
<p class="MsoNormal" align="right" style="text-align:right"><span style="font-size:11.0pt">22.8%<o:p></o:p></span></p>
</td>
<td style="padding:0cm 0cm 0cm 0cm;height:14.4pt">
<p class="MsoNormal" align="right" style="text-align:right"><span style="font-size:11.0pt">204,567,155<o:p></o:p></span></p>
</td>
<td style="padding:0cm 0cm 0cm 0cm;height:14.4pt">
<p class="MsoNormal"><span style="font-size:11.0pt">cog-zstd-pyes-lev18.tif<o:p></o:p></span></p>
</td>
<td style="padding:0cm 0cm 0cm 0cm;height:14.4pt">
<p class="MsoNormal"><span style="font-size:11.0pt">zstd<o:p></o:p></span></p>
</td>
<td style="padding:0cm 0cm 0cm 0cm;height:14.4pt">
<p class="MsoNormal"><span style="font-size:11.0pt">yes<o:p></o:p></span></p>
</td>
<td style="padding:0cm 0cm 0cm 0cm;height:14.4pt">
<p class="MsoNormal" align="right" style="text-align:right"><span style="font-size:11.0pt">18<o:p></o:p></span></p>
</td>
</tr>
<tr style="height:14.4pt">
<td style="padding:0cm 0cm 0cm 0cm;height:14.4pt">
<p class="MsoNormal" align="right" style="text-align:right"><span style="font-size:11.0pt">22.8%<o:p></o:p></span></p>
</td>
<td style="padding:0cm 0cm 0cm 0cm;height:14.4pt">
<p class="MsoNormal" align="right" style="text-align:right"><span style="font-size:11.0pt">204,594,678<o:p></o:p></span></p>
</td>
<td style="padding:0cm 0cm 0cm 0cm;height:14.4pt">
<p class="MsoNormal"><span style="font-size:11.0pt">cog-zstd-pyes-lev19.tif<o:p></o:p></span></p>
</td>
<td style="padding:0cm 0cm 0cm 0cm;height:14.4pt">
<p class="MsoNormal"><span style="font-size:11.0pt">zstd<o:p></o:p></span></p>
</td>
<td style="padding:0cm 0cm 0cm 0cm;height:14.4pt">
<p class="MsoNormal"><span style="font-size:11.0pt">yes<o:p></o:p></span></p>
</td>
<td style="padding:0cm 0cm 0cm 0cm;height:14.4pt">
<p class="MsoNormal" align="right" style="text-align:right"><span style="font-size:11.0pt">19<o:p></o:p></span></p>
</td>
</tr>
<tr style="height:14.4pt">
<td style="padding:0cm 0cm 0cm 0cm;height:14.4pt">
<p class="MsoNormal" align="right" style="text-align:right"><span style="font-size:11.0pt">22.8%<o:p></o:p></span></p>
</td>
<td style="padding:0cm 0cm 0cm 0cm;height:14.4pt">
<p class="MsoNormal" align="right" style="text-align:right"><span style="font-size:11.0pt">204,594,678<o:p></o:p></span></p>
</td>
<td style="padding:0cm 0cm 0cm 0cm;height:14.4pt">
<p class="MsoNormal"><span style="font-size:11.0pt">cog-zstd-pyes-lev20.tif<o:p></o:p></span></p>
</td>
<td style="padding:0cm 0cm 0cm 0cm;height:14.4pt">
<p class="MsoNormal"><span style="font-size:11.0pt">zstd<o:p></o:p></span></p>
</td>
<td style="padding:0cm 0cm 0cm 0cm;height:14.4pt">
<p class="MsoNormal"><span style="font-size:11.0pt">yes<o:p></o:p></span></p>
</td>
<td style="padding:0cm 0cm 0cm 0cm;height:14.4pt">
<p class="MsoNormal" align="right" style="text-align:right"><span style="font-size:11.0pt">20<o:p></o:p></span></p>
</td>
</tr>
<tr style="height:14.4pt">
<td style="padding:0cm 0cm 0cm 0cm;height:14.4pt">
<p class="MsoNormal" align="right" style="text-align:right"><span style="font-size:11.0pt">22.8%<o:p></o:p></span></p>
</td>
<td style="padding:0cm 0cm 0cm 0cm;height:14.4pt">
<p class="MsoNormal" align="right" style="text-align:right"><span style="font-size:11.0pt">204,626,722<o:p></o:p></span></p>
</td>
<td style="padding:0cm 0cm 0cm 0cm;height:14.4pt">
<p class="MsoNormal"><span style="font-size:11.0pt">cog-zstd-pyes-lev21.tif<o:p></o:p></span></p>
</td>
<td style="padding:0cm 0cm 0cm 0cm;height:14.4pt">
<p class="MsoNormal"><span style="font-size:11.0pt">zstd<o:p></o:p></span></p>
</td>
<td style="padding:0cm 0cm 0cm 0cm;height:14.4pt">
<p class="MsoNormal"><span style="font-size:11.0pt">yes<o:p></o:p></span></p>
</td>
<td style="padding:0cm 0cm 0cm 0cm;height:14.4pt">
<p class="MsoNormal" align="right" style="text-align:right"><span style="font-size:11.0pt">21<o:p></o:p></span></p>
</td>
</tr>
<tr style="height:14.4pt">
<td style="padding:0cm 0cm 0cm 0cm;height:14.4pt">
<p class="MsoNormal" align="right" style="text-align:right"><span style="font-size:11.0pt">22.8%<o:p></o:p></span></p>
</td>
<td style="padding:0cm 0cm 0cm 0cm;height:14.4pt">
<p class="MsoNormal" align="right" style="text-align:right"><span style="font-size:11.0pt">204,635,985<o:p></o:p></span></p>
</td>
<td style="padding:0cm 0cm 0cm 0cm;height:14.4pt">
<p class="MsoNormal"><span style="font-size:11.0pt">cog-zstd-pyes-lev22.tif<o:p></o:p></span></p>
</td>
<td style="padding:0cm 0cm 0cm 0cm;height:14.4pt">
<p class="MsoNormal"><span style="font-size:11.0pt">zstd<o:p></o:p></span></p>
</td>
<td style="padding:0cm 0cm 0cm 0cm;height:14.4pt">
<p class="MsoNormal"><span style="font-size:11.0pt">yes<o:p></o:p></span></p>
</td>
<td style="padding:0cm 0cm 0cm 0cm;height:14.4pt">
<p class="MsoNormal" align="right" style="text-align:right"><span style="font-size:11.0pt">22<o:p></o:p></span></p>
</td>
</tr>
<tr style="height:14.4pt">
<td style="padding:0cm 0cm 0cm 0cm;height:14.4pt">
<p class="MsoNormal" align="right" style="text-align:right"><span style="font-size:11.0pt">22.6%<o:p></o:p></span></p>
</td>
<td style="padding:0cm 0cm 0cm 0cm;height:14.4pt">
<p class="MsoNormal" align="right" style="text-align:right"><span style="font-size:11.0pt">205,026,301<o:p></o:p></span></p>
</td>
<td style="padding:0cm 0cm 0cm 0cm;height:14.4pt">
<p class="MsoNormal"><span style="font-size:11.0pt">cog-zstd-pyes-lev16.tif<o:p></o:p></span></p>
</td>
<td style="padding:0cm 0cm 0cm 0cm;height:14.4pt">
<p class="MsoNormal"><span style="font-size:11.0pt">zstd<o:p></o:p></span></p>
</td>
<td style="padding:0cm 0cm 0cm 0cm;height:14.4pt">
<p class="MsoNormal"><span style="font-size:11.0pt">yes<o:p></o:p></span></p>
</td>
<td style="padding:0cm 0cm 0cm 0cm;height:14.4pt">
<p class="MsoNormal" align="right" style="text-align:right"><span style="font-size:11.0pt">16<o:p></o:p></span></p>
</td>
</tr>
<tr style="height:14.4pt">
<td style="padding:0cm 0cm 0cm 0cm;height:14.4pt">
<p class="MsoNormal" align="right" style="text-align:right"><span style="font-size:11.0pt">21.5%<o:p></o:p></span></p>
</td>
<td style="padding:0cm 0cm 0cm 0cm;height:14.4pt">
<p class="MsoNormal" align="right" style="text-align:right"><span style="font-size:11.0pt">208,039,012<o:p></o:p></span></p>
</td>
<td style="padding:0cm 0cm 0cm 0cm;height:14.4pt">
<p class="MsoNormal"><span style="font-size:11.0pt">cog-zstd-pyes-lev15.tif<o:p></o:p></span></p>
</td>
<td style="padding:0cm 0cm 0cm 0cm;height:14.4pt">
<p class="MsoNormal"><span style="font-size:11.0pt">zstd<o:p></o:p></span></p>
</td>
<td style="padding:0cm 0cm 0cm 0cm;height:14.4pt">
<p class="MsoNormal"><span style="font-size:11.0pt">yes<o:p></o:p></span></p>
</td>
<td style="padding:0cm 0cm 0cm 0cm;height:14.4pt">
<p class="MsoNormal" align="right" style="text-align:right"><span style="font-size:11.0pt">15<o:p></o:p></span></p>
</td>
</tr>
<tr style="height:14.4pt">
<td style="padding:0cm 0cm 0cm 0cm;height:14.4pt">
<p class="MsoNormal" align="right" style="text-align:right"><span style="font-size:11.0pt">21.5%<o:p></o:p></span></p>
</td>
<td style="padding:0cm 0cm 0cm 0cm;height:14.4pt">
<p class="MsoNormal" align="right" style="text-align:right"><span style="font-size:11.0pt">208,094,559<o:p></o:p></span></p>
</td>
<td style="padding:0cm 0cm 0cm 0cm;height:14.4pt">
<p class="MsoNormal"><span style="font-size:11.0pt">cog-zstd-pyes-lev13.tif<o:p></o:p></span></p>
</td>
<td style="padding:0cm 0cm 0cm 0cm;height:14.4pt">
<p class="MsoNormal"><span style="font-size:11.0pt">zstd<o:p></o:p></span></p>
</td>
<td style="padding:0cm 0cm 0cm 0cm;height:14.4pt">
<p class="MsoNormal"><span style="font-size:11.0pt">yes<o:p></o:p></span></p>
</td>
<td style="padding:0cm 0cm 0cm 0cm;height:14.4pt">
<p class="MsoNormal" align="right" style="text-align:right"><span style="font-size:11.0pt">13<o:p></o:p></span></p>
</td>
</tr>
<tr style="height:14.4pt">
<td style="padding:0cm 0cm 0cm 0cm;height:14.4pt">
<p class="MsoNormal" align="right" style="text-align:right"><span style="font-size:11.0pt">21.5%<o:p></o:p></span></p>
</td>
<td style="padding:0cm 0cm 0cm 0cm;height:14.4pt">
<p class="MsoNormal" align="right" style="text-align:right"><span style="font-size:11.0pt">208,094,560<o:p></o:p></span></p>
</td>
<td style="padding:0cm 0cm 0cm 0cm;height:14.4pt">
<p class="MsoNormal"><span style="font-size:11.0pt">cog-zstd-pyes-lev14.tif<o:p></o:p></span></p>
</td>
<td style="padding:0cm 0cm 0cm 0cm;height:14.4pt">
<p class="MsoNormal"><span style="font-size:11.0pt">zstd<o:p></o:p></span></p>
</td>
<td style="padding:0cm 0cm 0cm 0cm;height:14.4pt">
<p class="MsoNormal"><span style="font-size:11.0pt">yes<o:p></o:p></span></p>
</td>
<td style="padding:0cm 0cm 0cm 0cm;height:14.4pt">
<p class="MsoNormal" align="right" style="text-align:right"><span style="font-size:11.0pt">14<o:p></o:p></span></p>
</td>
</tr>
<tr style="height:14.4pt">
<td style="padding:0cm 0cm 0cm 0cm;height:14.4pt">
<p class="MsoNormal" align="right" style="text-align:right"><span style="font-size:11.0pt">21.3%<o:p></o:p></span></p>
</td>
<td style="padding:0cm 0cm 0cm 0cm;height:14.4pt">
<p class="MsoNormal" align="right" style="text-align:right"><span style="font-size:11.0pt">208,714,731<o:p></o:p></span></p>
</td>
<td style="padding:0cm 0cm 0cm 0cm;height:14.4pt">
<p class="MsoNormal"><span style="font-size:11.0pt">cog-zstd-pyes-lev12.tif<o:p></o:p></span></p>
</td>
<td style="padding:0cm 0cm 0cm 0cm;height:14.4pt">
<p class="MsoNormal"><span style="font-size:11.0pt">zstd<o:p></o:p></span></p>
</td>
<td style="padding:0cm 0cm 0cm 0cm;height:14.4pt">
<p class="MsoNormal"><span style="font-size:11.0pt">yes<o:p></o:p></span></p>
</td>
<td style="padding:0cm 0cm 0cm 0cm;height:14.4pt">
<p class="MsoNormal" align="right" style="text-align:right"><span style="font-size:11.0pt">12<o:p></o:p></span></p>
</td>
</tr>
<tr style="height:14.4pt">
<td style="padding:0cm 0cm 0cm 0cm;height:14.4pt">
<p class="MsoNormal" align="right" style="text-align:right"><span style="font-size:11.0pt">21.2%<o:p></o:p></span></p>
</td>
<td style="padding:0cm 0cm 0cm 0cm;height:14.4pt">
<p class="MsoNormal" align="right" style="text-align:right"><span style="font-size:11.0pt">208,989,301<o:p></o:p></span></p>
</td>
<td style="padding:0cm 0cm 0cm 0cm;height:14.4pt">
<p class="MsoNormal"><span style="font-size:11.0pt">cog-zstd-pyes-lev11.tif<o:p></o:p></span></p>
</td>
<td style="padding:0cm 0cm 0cm 0cm;height:14.4pt">
<p class="MsoNormal"><span style="font-size:11.0pt">zstd<o:p></o:p></span></p>
</td>
<td style="padding:0cm 0cm 0cm 0cm;height:14.4pt">
<p class="MsoNormal"><span style="font-size:11.0pt">yes<o:p></o:p></span></p>
</td>
<td style="padding:0cm 0cm 0cm 0cm;height:14.4pt">
<p class="MsoNormal" align="right" style="text-align:right"><span style="font-size:11.0pt">11<o:p></o:p></span></p>
</td>
</tr>
<tr style="height:14.4pt">
<td style="padding:0cm 0cm 0cm 0cm;height:14.4pt">
<p class="MsoNormal" align="right" style="text-align:right"><span style="font-size:11.0pt">21.2%<o:p></o:p></span></p>
</td>
<td style="padding:0cm 0cm 0cm 0cm;height:14.4pt">
<p class="MsoNormal" align="right" style="text-align:right"><span style="font-size:11.0pt">208,989,994<o:p></o:p></span></p>
</td>
<td style="padding:0cm 0cm 0cm 0cm;height:14.4pt">
<p class="MsoNormal"><span style="font-size:11.0pt">cog-zstd-pyes-lev10.tif<o:p></o:p></span></p>
</td>
<td style="padding:0cm 0cm 0cm 0cm;height:14.4pt">
<p class="MsoNormal"><span style="font-size:11.0pt">zstd<o:p></o:p></span></p>
</td>
<td style="padding:0cm 0cm 0cm 0cm;height:14.4pt">
<p class="MsoNormal"><span style="font-size:11.0pt">yes<o:p></o:p></span></p>
</td>
<td style="padding:0cm 0cm 0cm 0cm;height:14.4pt">
<p class="MsoNormal" align="right" style="text-align:right"><span style="font-size:11.0pt">10<o:p></o:p></span></p>
</td>
</tr>
<tr style="height:14.4pt">
<td style="padding:0cm 0cm 0cm 0cm;height:14.4pt">
<p class="MsoNormal" align="right" style="text-align:right"><span style="font-size:11.0pt">21.1%<o:p></o:p></span></p>
</td>
<td style="padding:0cm 0cm 0cm 0cm;height:14.4pt">
<p class="MsoNormal" align="right" style="text-align:right"><span style="font-size:11.0pt">209,071,549<o:p></o:p></span></p>
</td>
<td style="padding:0cm 0cm 0cm 0cm;height:14.4pt">
<p class="MsoNormal"><span style="font-size:11.0pt">cog-zstd-pyes-lev9.tif<o:p></o:p></span></p>
</td>
<td style="padding:0cm 0cm 0cm 0cm;height:14.4pt">
<p class="MsoNormal"><span style="font-size:11.0pt">zstd<o:p></o:p></span></p>
</td>
<td style="padding:0cm 0cm 0cm 0cm;height:14.4pt">
<p class="MsoNormal"><span style="font-size:11.0pt">yes<o:p></o:p></span></p>
</td>
<td style="padding:0cm 0cm 0cm 0cm;height:14.4pt">
<p class="MsoNormal" align="right" style="text-align:right"><span style="font-size:11.0pt">9<o:p></o:p></span></p>
</td>
</tr>
<tr style="height:14.4pt">
<td style="padding:0cm 0cm 0cm 0cm;height:14.4pt">
<p class="MsoNormal" align="right" style="text-align:right"><span style="font-size:11.0pt">21.0%<o:p></o:p></span></p>
</td>
<td style="padding:0cm 0cm 0cm 0cm;height:14.4pt">
<p class="MsoNormal" align="right" style="text-align:right"><span style="font-size:11.0pt">209,453,858<o:p></o:p></span></p>
</td>
<td style="padding:0cm 0cm 0cm 0cm;height:14.4pt">
<p class="MsoNormal"><span style="font-size:11.0pt">cog-zstd-pyes-lev8.tif<o:p></o:p></span></p>
</td>
<td style="padding:0cm 0cm 0cm 0cm;height:14.4pt">
<p class="MsoNormal"><span style="font-size:11.0pt">zstd<o:p></o:p></span></p>
</td>
<td style="padding:0cm 0cm 0cm 0cm;height:14.4pt">
<p class="MsoNormal"><span style="font-size:11.0pt">yes<o:p></o:p></span></p>
</td>
<td style="padding:0cm 0cm 0cm 0cm;height:14.4pt">
<p class="MsoNormal" align="right" style="text-align:right"><span style="font-size:11.0pt">8<o:p></o:p></span></p>
</td>
</tr>
<tr style="height:14.4pt">
<td style="padding:0cm 0cm 0cm 0cm;height:14.4pt">
<p class="MsoNormal" align="right" style="text-align:right"><span style="font-size:11.0pt">20.9%<o:p></o:p></span></p>
</td>
<td style="padding:0cm 0cm 0cm 0cm;height:14.4pt">
<p class="MsoNormal" align="right" style="text-align:right"><span style="font-size:11.0pt">209,634,360<o:p></o:p></span></p>
</td>
<td style="padding:0cm 0cm 0cm 0cm;height:14.4pt">
<p class="MsoNormal"><span style="font-size:11.0pt">cog-zstd-pyes-lev7.tif<o:p></o:p></span></p>
</td>
<td style="padding:0cm 0cm 0cm 0cm;height:14.4pt">
<p class="MsoNormal"><span style="font-size:11.0pt">zstd<o:p></o:p></span></p>
</td>
<td style="padding:0cm 0cm 0cm 0cm;height:14.4pt">
<p class="MsoNormal"><span style="font-size:11.0pt">yes<o:p></o:p></span></p>
</td>
<td style="padding:0cm 0cm 0cm 0cm;height:14.4pt">
<p class="MsoNormal" align="right" style="text-align:right"><span style="font-size:11.0pt">7<o:p></o:p></span></p>
</td>
</tr>
<tr style="height:14.4pt">
<td style="padding:0cm 0cm 0cm 0cm;height:14.4pt">
<p class="MsoNormal" align="right" style="text-align:right"><span style="font-size:11.0pt">20.7%<o:p></o:p></span></p>
</td>
<td style="padding:0cm 0cm 0cm 0cm;height:14.4pt">
<p class="MsoNormal" align="right" style="text-align:right"><span style="font-size:11.0pt">210,182,178<o:p></o:p></span></p>
</td>
<td style="padding:0cm 0cm 0cm 0cm;height:14.4pt">
<p class="MsoNormal"><span style="font-size:11.0pt">cog-zstd-pyes-lev6.tif<o:p></o:p></span></p>
</td>
<td style="padding:0cm 0cm 0cm 0cm;height:14.4pt">
<p class="MsoNormal"><span style="font-size:11.0pt">zstd<o:p></o:p></span></p>
</td>
<td style="padding:0cm 0cm 0cm 0cm;height:14.4pt">
<p class="MsoNormal"><span style="font-size:11.0pt">yes<o:p></o:p></span></p>
</td>
<td style="padding:0cm 0cm 0cm 0cm;height:14.4pt">
<p class="MsoNormal" align="right" style="text-align:right"><span style="font-size:11.0pt">6<o:p></o:p></span></p>
</td>
</tr>
<tr style="height:14.4pt">
<td style="padding:0cm 0cm 0cm 0cm;height:14.4pt">
<p class="MsoNormal" align="right" style="text-align:right"><span style="font-size:11.0pt">20.4%<o:p></o:p></span></p>
</td>
<td style="padding:0cm 0cm 0cm 0cm;height:14.4pt">
<p class="MsoNormal" align="right" style="text-align:right"><span style="font-size:11.0pt">210,992,074<o:p></o:p></span></p>
</td>
<td style="padding:0cm 0cm 0cm 0cm;height:14.4pt">
<p class="MsoNormal"><span style="font-size:11.0pt">cog-zstd-pyes-lev5.tif<o:p></o:p></span></p>
</td>
<td style="padding:0cm 0cm 0cm 0cm;height:14.4pt">
<p class="MsoNormal"><span style="font-size:11.0pt">zstd<o:p></o:p></span></p>
</td>
<td style="padding:0cm 0cm 0cm 0cm;height:14.4pt">
<p class="MsoNormal"><span style="font-size:11.0pt">yes<o:p></o:p></span></p>
</td>
<td style="padding:0cm 0cm 0cm 0cm;height:14.4pt">
<p class="MsoNormal" align="right" style="text-align:right"><span style="font-size:11.0pt">5<o:p></o:p></span></p>
</td>
</tr>
<tr style="height:14.4pt">
<td style="padding:0cm 0cm 0cm 0cm;height:14.4pt">
<p class="MsoNormal" align="right" style="text-align:right"><span style="font-size:11.0pt">18.9%<o:p></o:p></span></p>
</td>
<td style="padding:0cm 0cm 0cm 0cm;height:14.4pt">
<p class="MsoNormal" align="right" style="text-align:right"><span style="font-size:11.0pt">214,894,175<o:p></o:p></span></p>
</td>
<td style="padding:0cm 0cm 0cm 0cm;height:14.4pt">
<p class="MsoNormal"><span style="font-size:11.0pt">cog-zstd-pyes-lev4.tif<o:p></o:p></span></p>
</td>
<td style="padding:0cm 0cm 0cm 0cm;height:14.4pt">
<p class="MsoNormal"><span style="font-size:11.0pt">zstd<o:p></o:p></span></p>
</td>
<td style="padding:0cm 0cm 0cm 0cm;height:14.4pt">
<p class="MsoNormal"><span style="font-size:11.0pt">yes<o:p></o:p></span></p>
</td>
<td style="padding:0cm 0cm 0cm 0cm;height:14.4pt">
<p class="MsoNormal" align="right" style="text-align:right"><span style="font-size:11.0pt">4<o:p></o:p></span></p>
</td>
</tr>
<tr style="height:14.4pt">
<td style="padding:0cm 0cm 0cm 0cm;height:14.4pt">
<p class="MsoNormal" align="right" style="text-align:right"><span style="font-size:11.0pt">17.4%<o:p></o:p></span></p>
</td>
<td style="padding:0cm 0cm 0cm 0cm;height:14.4pt">
<p class="MsoNormal" align="right" style="text-align:right"><span style="font-size:11.0pt">218,911,762<o:p></o:p></span></p>
</td>
<td style="padding:0cm 0cm 0cm 0cm;height:14.4pt">
<p class="MsoNormal"><span style="font-size:11.0pt">cog-zstd-pyes-lev3.tif<o:p></o:p></span></p>
</td>
<td style="padding:0cm 0cm 0cm 0cm;height:14.4pt">
<p class="MsoNormal"><span style="font-size:11.0pt">lzw<o:p></o:p></span></p>
</td>
<td style="padding:0cm 0cm 0cm 0cm;height:14.4pt">
<p class="MsoNormal" align="right" style="text-align:right"><span style="font-size:11.0pt">2<o:p></o:p></span></p>
</td>
<td style="padding:0cm 0cm 0cm 0cm;height:14.4pt">
<p class="MsoNormal" align="right" style="text-align:right"><span style="font-size:11.0pt">3<o:p></o:p></span></p>
</td>
</tr>
<tr style="height:14.4pt">
<td style="padding:0cm 0cm 0cm 0cm;height:14.4pt">
<p class="MsoNormal" align="right" style="text-align:right"><span style="font-size:11.0pt">16.6%<o:p></o:p></span></p>
</td>
<td style="padding:0cm 0cm 0cm 0cm;height:14.4pt">
<p class="MsoNormal" align="right" style="text-align:right"><span style="font-size:11.0pt">220,991,236<o:p></o:p></span></p>
</td>
<td style="padding:0cm 0cm 0cm 0cm;height:14.4pt">
<p class="MsoNormal"><span style="font-size:11.0pt">cog-dflt-p2.tif<o:p></o:p></span></p>
</td>
<td style="padding:0cm 0cm 0cm 0cm;height:14.4pt">
<p class="MsoNormal"><span style="font-size:11.0pt">deflate<o:p></o:p></span></p>
</td>
<td style="padding:0cm 0cm 0cm 0cm;height:14.4pt">
<p class="MsoNormal" align="right" style="text-align:right"><span style="font-size:11.0pt">2<o:p></o:p></span></p>
</td>
<td style="padding:0cm 0cm 0cm 0cm;height:14.4pt"></td>
</tr>
<tr style="height:14.4pt">
<td style="padding:0cm 0cm 0cm 0cm;height:14.4pt">
<p class="MsoNormal" align="right" style="text-align:right"><span style="font-size:11.0pt">13.0%<o:p></o:p></span></p>
</td>
<td style="padding:0cm 0cm 0cm 0cm;height:14.4pt">
<p class="MsoNormal" align="right" style="text-align:right"><span style="font-size:11.0pt">230,553,902<o:p></o:p></span></p>
</td>
<td style="padding:0cm 0cm 0cm 0cm;height:14.4pt">
<p class="MsoNormal"><span style="font-size:11.0pt">cog-zstd-pyes-lev2.tif<o:p></o:p></span></p>
</td>
<td style="padding:0cm 0cm 0cm 0cm;height:14.4pt">
<p class="MsoNormal"><span style="font-size:11.0pt">zstd<o:p></o:p></span></p>
</td>
<td style="padding:0cm 0cm 0cm 0cm;height:14.4pt">
<p class="MsoNormal"><span style="font-size:11.0pt">yes<o:p></o:p></span></p>
</td>
<td style="padding:0cm 0cm 0cm 0cm;height:14.4pt">
<p class="MsoNormal" align="right" style="text-align:right"><span style="font-size:11.0pt">2<o:p></o:p></span></p>
</td>
</tr>
<tr style="height:14.4pt">
<td style="padding:0cm 0cm 0cm 0cm;height:14.4pt">
<p class="MsoNormal" align="right" style="text-align:right"><span style="font-size:11.0pt">11.6%<o:p></o:p></span></p>
</td>
<td style="padding:0cm 0cm 0cm 0cm;height:14.4pt">
<p class="MsoNormal" align="right" style="text-align:right"><span style="font-size:11.0pt">234,277,147<o:p></o:p></span></p>
</td>
<td style="padding:0cm 0cm 0cm 0cm;height:14.4pt">
<p class="MsoNormal"><span style="font-size:11.0pt">cog-zstd-pyes-lev1.tif<o:p></o:p></span></p>
</td>
<td style="padding:0cm 0cm 0cm 0cm;height:14.4pt">
<p class="MsoNormal"><span style="font-size:11.0pt">zstd<o:p></o:p></span></p>
</td>
<td style="padding:0cm 0cm 0cm 0cm;height:14.4pt">
<p class="MsoNormal"><span style="font-size:11.0pt">yes<o:p></o:p></span></p>
</td>
<td style="padding:0cm 0cm 0cm 0cm;height:14.4pt">
<p class="MsoNormal" align="right" style="text-align:right"><span style="font-size:11.0pt">1<o:p></o:p></span></p>
</td>
</tr>
<tr style="height:14.4pt">
<td style="padding:0cm 0cm 0cm 0cm;height:14.4pt">
<p class="MsoNormal" align="right" style="text-align:right"><span style="font-size:11.0pt">5.7%<o:p></o:p></span></p>
</td>
<td style="padding:0cm 0cm 0cm 0cm;height:14.4pt">
<p class="MsoNormal" align="right" style="text-align:right"><span style="font-size:11.0pt">249,979,858<o:p></o:p></span></p>
</td>
<td style="padding:0cm 0cm 0cm 0cm;height:14.4pt">
<p class="MsoNormal"><span style="font-size:11.0pt">cog-dflt-p1.tif<o:p></o:p></span></p>
</td>
<td style="padding:0cm 0cm 0cm 0cm;height:14.4pt">
<p class="MsoNormal"><span style="font-size:11.0pt">deflate<o:p></o:p></span></p>
</td>
<td style="padding:0cm 0cm 0cm 0cm;height:14.4pt">
<p class="MsoNormal" align="right" style="text-align:right"><span style="font-size:11.0pt">1<o:p></o:p></span></p>
</td>
<td style="padding:0cm 0cm 0cm 0cm;height:14.4pt"></td>
</tr>
<tr style="height:14.4pt">
<td style="border:none;border-bottom:solid black 1.0pt;padding:0cm 0cm 0cm 0cm;height:14.4pt">
<p class="MsoNormal" align="right" style="text-align:right"><span style="font-size:11.0pt">0.0%<o:p></o:p></span></p>
</td>
<td style="border:none;border-bottom:solid black 1.0pt;padding:0cm 0cm 0cm 0cm;height:14.4pt">
<p class="MsoNormal" align="right" style="text-align:right"><span style="font-size:11.0pt">265,062,854<o:p></o:p></span></p>
</td>
<td style="border:none;border-bottom:solid black 1.0pt;padding:0cm 0cm 0cm 0cm;height:14.4pt">
<p class="MsoNormal"><span style="font-size:11.0pt">cog-lzw-p2.tif<o:p></o:p></span></p>
</td>
<td style="border:none;border-bottom:solid black 1.0pt;padding:0cm 0cm 0cm 0cm;height:14.4pt">
<p class="MsoNormal"><span style="font-size:11.0pt">lzw<o:p></o:p></span></p>
</td>
<td style="border:none;border-bottom:solid black 1.0pt;padding:0cm 0cm 0cm 0cm;height:14.4pt">
<p class="MsoNormal" align="right" style="text-align:right"><span style="font-size:11.0pt">2<o:p></o:p></span></p>
</td>
<td style="border:none;border-bottom:solid black 1.0pt;padding:0cm 0cm 0cm 0cm;height:14.4pt">
</td>
</tr>
</tbody>
</table>
<p class="MsoNormal"><span lang="EN-GB" style="font-family:"Arial",sans-serif;color:black"><o:p> </o:p></span></p>
</div>
<div>
<p class="MsoNormal"><span lang="EN-GB" style="font-family:"Arial",sans-serif;color:black"><o:p> </o:p></span></p>
</div>
<div>
<p class="MsoNormal"><span lang="EN-GB" style="font-family:"Arial",sans-serif;color:black">Command line pattern:<o:p></o:p></span></p>
</div>
<div>
<p class="MsoNormal"><span lang="EN-GB" style="font-family:"Arial",sans-serif;color:black"><o:p> </o:p></span></p>
</div>
<div>
<p><span lang="EN-GB" style="font-family:"Courier New";color:black">gdal_translate ^<o:p></o:p></span></p>
<p><span lang="EN-GB" style="font-family:"Courier New";color:black"> -co compress=zstd ^<o:p></o:p></span></p>
<p><span lang="EN-GB" style="font-family:"Courier New";color:black"> -co predictor=yes ^<o:p></o:p></span></p>
<p><span lang="EN-GB" style="font-family:"Courier New";color:black"> -co level=3 ^<o:p></o:p></span></p>
<p><span lang="EN-GB" style="font-family:"Courier New";color:black"> -co num_threads=all_cpus ^<o:p></o:p></span></p>
<p><span lang="EN-GB" style="font-family:"Courier New";color:black"> -of cog ^<o:p></o:p></span></p>
<p><span lang="EN-GB" style="font-family:"Courier New";color:black"> mtn-view.tif ^<o:p></o:p></span></p>
<p><span lang="EN-GB" style="font-family:"Courier New";color:black"> mtn-view-cog-zstd-pyes-lev3.tif<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-GB" style="font-family:"Arial",sans-serif;color:black"><o:p> </o:p></span></p>
</div>
<div>
<p class="MsoNormal"><span lang="EN-GB" style="font-family:"Arial",sans-serif;color:black"><o:p> </o:p></span></p>
</div>
<div>
<p class="MsoNormal" style="margin-bottom:12.0pt"><span lang="EN-GB" style="font-family:"Arial",sans-serif;color:black">Source image:<o:p></o:p></span></p>
</div>
<div>
<div>
<table class="MsoNormalTable" border="0" cellspacing="0" cellpadding="0" style="border-collapse:collapse">
<tbody>
<tr>
<td width="70" valign="top" style="width:76.25pt;border:solid #A3A3A3 1.0pt;padding:4.0pt 4.0pt 4.0pt 4.0pt">
<p><b>Name</b><o:p></o:p></p>
</td>
<td width="637" valign="top" style="width:378.45pt;border:solid #A3A3A3 1.0pt;border-left:none;padding:4.0pt 4.0pt 4.0pt 4.0pt">
<p>AerialPhotos/AerialPhotos<o:p></o:p></p>
</td>
</tr>
<tr>
<td width="70" valign="top" style="width:76.25pt;border:solid #A3A3A3 1.0pt;border-top:none;padding:4.0pt 4.0pt 4.0pt 4.0pt">
<p><b>URL</b><o:p></o:p></p>
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<p><a href="https://mapservices.gov.yk.ca/imagery/rest/services/AerialPhotos/AerialPhotos/ImageServer">https://mapservices.gov.yk.ca/imagery/rest/services/AerialPhotos/AerialPhotos/ImageServer</a><o:p></o:p></p>
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<p><b>Source</b><o:p></o:p></p>
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<td width="637" valign="top" style="width:383.45pt;border-top:none;border-left:none;border-bottom:solid #A3A3A3 1.0pt;border-right:solid #A3A3A3 1.0pt;padding:4.0pt 4.0pt 4.0pt 4.0pt">
<p>crs='EPSG:3578' format='JPGPNG' layer='' url='https://mapservices.gov.yk.ca/imagery/rest/services/AerialPhotos/AerialPhotos/ImageServer'<o:p></o:p></p>
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<p><b>CRS</b><o:p></o:p></p>
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<td width="637" valign="top" style="width:378.45pt;border-top:none;border-left:none;border-bottom:solid #A3A3A3 1.0pt;border-right:solid #A3A3A3 1.0pt;padding:4.0pt 4.0pt 4.0pt 4.0pt">
<p>EPSG:3578 - NAD83 / Yukon Albers - Projected<o:p></o:p></p>
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<p><b>Export extent</b><o:p></o:p></p>
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<td width="637" valign="top" style="width:377.05pt;border-top:none;border-left:none;border-bottom:solid #A3A3A3 1.0pt;border-right:solid #A3A3A3 1.0pt;padding:4.0pt 4.0pt 4.0pt 4.0pt">
<p><em><span style="font-family:"Calibri",sans-serif">Upper Left, <span style="color:black;background:white">Lower Left, Upper Right, Lower Right</span></span></em><o:p></o:p></p>
<p>356750.816, 702590.026<o:p></o:p></p>
<p>356750.816, 699097.526<o:p></o:p></p>
<p>361572.583, 702590.026<o:p></o:p></p>
<p>361572.583, 699097.526<o:p></o:p></p>
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<td width="70" valign="top" style="width:76.25pt;border:solid #A3A3A3 1.0pt;border-top:none;padding:4.0pt 4.0pt 4.0pt 4.0pt">
<p><b>Pixel size</b><o:p></o:p></p>
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<td width="637" valign="top" style="width:378.45pt;border-top:none;border-left:none;border-bottom:solid #A3A3A3 1.0pt;border-right:solid #A3A3A3 1.0pt;padding:4.0pt 4.0pt 4.0pt 4.0pt">
<p>0.5m<o:p></o:p></p>
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<p class="MsoNormal"><span lang="EN-GB" style="font-family:"Arial",sans-serif;color:black">Do others see the same thing?<o:p></o:p></span></p>
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<b><span lang="EN-US" style="font-family:"Arial",sans-serif;color:#244C5A">Matt Wilkie</span></b><span lang="EN-GB" style="color:black"><o:p></o:p></span></p>
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