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<p class="MsoNormal"><span style="font-family:"Arial",sans-serif;color:black;mso-fareast-language:EN-US"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-family:"Arial",sans-serif;color:black;mso-fareast-language:EN-US">Hi Even,<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-family:"Arial",sans-serif;color:black;mso-fareast-language:EN-US"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-family:"Arial",sans-serif;color:black;mso-fareast-language:EN-US">Thanks for getting back to me. I should have mentioned we're using the Python bindings, but presumably we can still do something like this?<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-family:"Arial",sans-serif;color:black;mso-fareast-language:EN-US">ds = gdal.OpenEx(path, open_options=['OVERVIEW_LEVEL=NONE'])<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-family:"Arial",sans-serif;color:black;mso-fareast-language:EN-US"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-family:"Arial",sans-serif;color:black;mso-fareast-language:EN-US">Jon<o:p></o:p></span></p>
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If you are not the named addressee you should not disseminate, distribute or copy this e-mail.</span><br /><span style="background-color:#FFFFFF;">Please notify the sender immediately by email if you have received this email by mistake and delete this email from your system.</span> <br /><span style="background-color:#FFFFFF;">JBA Risk Management Limited is registered in England, company number 07732946, 1 Broughton Park, Old Lane North, Broughton, Skipton, North Yorkshire, BD23 3FD, England</span><span style="color:#000001;">.</span><br /></td></tr></table></td></tr></table></td></tr></table></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">From:</span></b><span lang="EN-US"> Even Rouault <even.rouault@spatialys.com>
<br>
<b>Sent:</b> 28 May 2021 15:03<br>
<b>To:</b> Jon Morris <Jon.Morris@jbarisk.com>; gdal-dev@lists.osgeo.org<br>
<b>Subject:</b> Re: [gdal-dev] How to stop gdal_translate using overviews when resampling<o:p></o:p></span></p>
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<p class="MsoNormal"><o:p> </o:p></p>
<p>With GDAL 3.3, you could add -oo OVERVIEW_LEVEL=NONE. See <a href="https://gdal.org/api/raster_c_api.html?highlight=overview_level#_CPPv410GDALOpenExPKcjPPCKcPPCKcPPCKc">
https://gdal.org/api/raster_c_api.html?highlight=overview_level#_CPPv410GDALOpenExPKcjPPCKcPPCKcPPCKc</a><o:p></o:p></p>
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<p class="MsoNormal">Le 28/05/2021 à 15:56, Jon Morris a écrit :<o:p></o:p></p>
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<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto">Hello all,<o:p></o:p></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"> <o:p></o:p></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto">One of our users reported a difference in outputs after we upgraded from GDAL 2.2 to 3.2. Our tool is using gdal_translate to resample a raster from 5m to 10m and the outputs are
very different. <o:p></o:p></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"> <o:p></o:p></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto">I'm ok with things changing between major versions, but when investigating, I found that the outputs also change depending on whether the input file has overviews. I was aware of
the issue with gdalwarp where overviews are used as a shortcut (<a href="http://erouault.blogspot.com/2014/10/warping-overviews-and-warped-overviews.html">http://erouault.blogspot.com/2014/10/warping-overviews-and-warped-overviews.html</a>), but haven't been
able to find anything similar in the docs or the code when it comes to gdal_translate.<o:p></o:p></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"> <o:p></o:p></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto">Should overviews make a difference? Is there any way to disable this behaviour, so the resampling is always done using the input raster and not the overviews?
<o:p></o:p></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"> <o:p></o:p></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto">Thanks,<o:p></o:p></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"> <o:p></o:p></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto">Jon<o:p></o:p></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"> <o:p></o:p></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"><b>Jon Morris</b><o:p></o:p></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"><b>Software Developer</b><o:p></o:p></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"> <o:p></o:p></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"> <o:p></o:p></p>
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<p class="MsoNormal">e: <o:p></o:p></p>
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<p class="MsoNormal"><a href="mailto:Jon.Morris@jbarisk.com" target="_blank"><strong><span style="font-family:"Calibri",sans-serif">Jon.Morris@jbarisk.com</span></strong></a><o:p></o:p></p>
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<o:p></o:p></p>
<pre>_______________________________________________<o:p></o:p></pre>
<pre>gdal-dev mailing list<o:p></o:p></pre>
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<pre>-- <o:p></o:p></pre>
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