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<p>You may need to specify the pixel size with the -ps argument to
be the one with the less resolution.</p>
<p>Or try using gdalwarp instead (you may also need to use the -tr
argument to specify the resolution). gdal_merge cannot deal with
rasters larger than memory.<br>
</p>
<div class="moz-cite-prefix">Le 05/12/2022 à 12:46, Clive Swan a
écrit :<br>
</div>
<blockquote type="cite"
cite="mid:CWXP123MB39598752820997674CC7529DA0189@CWXP123MB3959.GBRP123.PROD.OUTLOOK.COM">
<div dir="auto">Hi,</div>
<div dir="auto"><br>
</div>
<div dir="auto">The raster <span>one </span>is the world, the
second is the UK.</div>
<div dir="auto">The UK fits within the first raster...</div>
<div dir="auto">
<br>
</div>
<div dir="auto">
We want to update UK data in raster one.</div>
<div dir="auto">
<br>
</div>
<div dir="auto">
Regards,</div>
<div dir="auto">
<br>
</div>
<div dir="auto">
Clive</div>
<div><br>
</div>
<div id="ms-outlook-mobile-signature" dir="auto">Get <a
href="https://aka.ms/AAb9ysg" moz-do-not-send="true">
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<hr tabindex="-1">
<div id="divRplyFwdMsg" dir="ltr"><b>From:</b> Rahkonen Jukka
<a class="moz-txt-link-rfc2396E" href="mailto:jukka.rahkonen@maanmittauslaitos.fi"><jukka.rahkonen@maanmittauslaitos.fi></a><br>
<b>Sent:</b> Monday, December 5, 2022 11:34:53 AM<br>
<b>To:</b> Clive Swan <a class="moz-txt-link-rfc2396E" href="mailto:cliveswan@gmail.com"><cliveswan@gmail.com></a>;
<a class="moz-txt-link-abbreviated" href="mailto:gdal-dev@lists.osgeo.org">gdal-dev@lists.osgeo.org</a> <a class="moz-txt-link-rfc2396E" href="mailto:gdal-dev@lists.osgeo.org"><gdal-dev@lists.osgeo.org></a><br>
<b>Subject:</b> Re: [gdal-dev] gdal_merge
<div> </div>
</div>
<div lang="FI">
<div class="x_WordSection1">
<p class="x_MsoNormal"><span>Hi,</span></p>
<p class="x_MsoNormal"><span> </span></p>
<p class="x_MsoNormal"><span lang="EN-US">Maybe your rasters
are far apart. Gdal_merge creates a raster with so large
extent that all the source images fit within it. Even
empty pixels take space.</span></p>
<p class="x_MsoNormal"><span lang="EN-US"> </span></p>
<p class="x_MsoNormal"><span lang="EN-US">-Jukka Rahkonen-</span></p>
<p class="x_MsoNormal"><span lang="EN-US"> </span></p>
<p class="x_MsoNormal"><span lang="EN-US"> </span></p>
<div>
<p class="x_MsoNormal"><b>Lähettäjä:</b> gdal-dev
<a class="moz-txt-link-rfc2396E" href="mailto:gdal-dev-bounces@lists.osgeo.org"><gdal-dev-bounces@lists.osgeo.org></a>
<b>Puolesta </b>Clive Swan<br>
<b>Lähetetty:</b> maanantai 5. joulukuuta 2022 12.24<br>
<b>Vastaanottaja:</b> <a class="moz-txt-link-abbreviated" href="mailto:gdal-dev@lists.osgeo.org">gdal-dev@lists.osgeo.org</a><br>
<b>Aihe:</b> [gdal-dev] gdal_merge</p>
</div>
<p class="x_MsoNormal"> </p>
<div>
<p class="x_MsoNormal">Hi Even,</p>
<p class="x_MsoNormal"> </p>
<p class="x_MsoNormal">Thanks <br>
the –configuration sorted out that issue.</p>
<p class="x_MsoNormal"><span>CPL_VSIL_USE_TEMP_FILE_FOR_RANDOM_WRITE
is a configuration option /
</span></p>
<p class="x_MsoNormal"><span>environment variable, so you
have to pass it with --config
</span></p>
<p class="x_MsoNormal"><span>CPL_VSIL_USE_TEMP_FILE_FOR_RANDOM_WRITE
YES</span></p>
<p class="x_MsoNormal"><br>
<br>
Now I am getting a memory issue?? << The input files
are 6.9 GB + 672 MB<br>
The output should be 7.xx GB</p>
<p class="x_MsoNormal"> </p>
<p class="x_gmail-p1">
<span class="x_gmail-s1"><span>6.9 GB + 672MB</span></span><span></span></p>
<p class="x_gmail-p1">
<span class="x_gmail-s1"><span>numpy.core._exceptions._ArrayMemoryError:
Unable to allocate 377. GiB for an array with shape
(225000, 450000) and data type float32</span></span><span></span></p>
<p class="x_MsoNormal"> </p>
<p class="x_MsoNormal">Any suggestions appreciated</p>
<p class="x_MsoNormal">Kind regards,</p>
<p class="x_MsoNormal">Clive</p>
<p class="x_MsoNormal"><br>
<br>
-- </p>
<div>
<div>
<div>
<div>
<div>
<div>
<p><span> Regards,</span></p>
<p> </p>
<p><span>Clive Swan</span></p>
<p><span>--</span></p>
</div>
</div>
</div>
</div>
</div>
</div>
</div>
</div>
</div>
<br>
<fieldset class="moz-mime-attachment-header"></fieldset>
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</pre>
</blockquote>
<pre class="moz-signature" cols="72">--
<a class="moz-txt-link-freetext" href="http://www.spatialys.com">http://www.spatialys.com</a>
My software is free, but my time generally not.</pre>
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