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<p>Maxime,</p>
<p><br>
</p>
<p>you need to do in 2 steps, with something like (didn't test,
slight modifications may be needed):</p>
<p>- slightly modify your first step, to reproject to an
intermediate RGBA dataset, with dstAlpha=yes. That temporary
dataset may be a VRT, or a GeoTIFF with a lossless compression (ie
DEFLATE)<br>
</p>
<p>- convert from RGBA to RGB+mask with gdal.Translate(out,
tmp_dataset_of_previous_step, bandList=[1,2,3], maskBand=4,
creationOptions=["COMPRESS=JPEG", "PHOTOMETRIC=YCBCR",
"TILED=YES", "BIGTIFF=YES"])</p>
<p><br>
</p>
<p>Even<br>
</p>
<p><br>
</p>
<div class="moz-cite-prefix">Le 27/01/2025 à 16:58, Maxime Demers
via gdal-dev a écrit :<br>
</div>
<blockquote type="cite"
cite="mid:YQXPR01MB4133E2F15CA8D9B781678D2AF7EC2@YQXPR01MB4133.CANPRD01.PROD.OUTLOOK.COM">
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Hi everybody, I hope you are all well!<br>
<br>
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I have an issue that I would need help about if possible.</div>
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<span
style="font-family: Aptos, Aptos_EmbeddedFont, Aptos_MSFontService, Calibri, Helvetica, sans-serif;">I
would like to use the GDAL Python bindings to reproject a TIFF
that has an external nodata mask stored in a separate
</span><span style="font-family: var(--ff-mono);"><code
style="font-family: var(--ff-mono);">.msk</code></span><span
style="font-family: Aptos, Aptos_EmbeddedFont, Aptos_MSFontService, Calibri, Helvetica, sans-serif;"> file.
Also, this is important to me to keep the jpeg compression.</span></div>
<div class="elementToProof"
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<span
style="font-family: Aptos, Aptos_EmbeddedFont, Aptos_MSFontService, Calibri, Helvetica, sans-serif;">After
some tests, I found out that
</span><span style="font-family: var(--ff-mono);"><code
style="font-family: var(--ff-mono);">gdal.Warp</code></span><span
style="font-family: Aptos, Aptos_EmbeddedFont, Aptos_MSFontService, Calibri, Helvetica, sans-serif;"> does
not reproject the
</span><span style="font-family: var(--ff-mono);"><code
style="font-family: var(--ff-mono);">.msk</code></span></div>
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Is there a way to acheive what I am trying to do?</div>
<pre
style="margin: 0px; border-radius: var(--br-md); width: auto; max-height: 600px;"><div
style="text-align: left; text-indent: 0px; line-height: var(--lh-md); font-family: Aptos, Aptos_EmbeddedFont, Aptos_MSFontService, Calibri, Helvetica, sans-serif; font-size: 11pt; color: rgb(0, 0, 0);"><code>import os
from osgeo import gdal
IN_RASTER = os.path.join(r"C:\\", "data", "Ortho", "Ortho2024_32187_10cm_mask.tif")
OUT_RASTER = os.path.join(r"C:\\", "data", "Ortho", "Ortho2024_3857_10cm_mask.tif")
src = gdal.Open(IN_RASTER)
dst = gdal.Warp(
OUT_RASTER,
src,
format="GTiff",
dstSRS="EPSG:3857",
creationOptions=["COMPRESS=JPEG", "PHOTOMETRIC=YCBCR", "TILED=YES", "BIGTIFF=YES"],
callback=gdal.TermProgress_nocb
)
dst = None</code></div></pre>
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<p><span
style="font-family: Arial, sans-serif; color: rgb(0, 32, 96);"><img
style="width: 2.25in; height: 1.175in; margin-top: 0px; margin-bottom: 0px;"
data-outlook-trace="F:1|T:1"
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class="" width="216" height="112"></span></p>
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<p><span
style="font-family: Arial, sans-serif; color: rgb(0, 32, 96);"><b> </b></span></p>
<p><span
style="font-family: Arial, sans-serif; color: rgb(0, 44, 81);"><b>Maxime
Demers</b></span></p>
<p><span
style="font-family: Arial, sans-serif; color: rgb(0, 44, 81);">Analyste
en géomatique</span></p>
<p><span
style="font-family: Arial, sans-serif; color: rgb(0, 44, 81);">Service
de la planification</span></p>
<p><span
style="font-family: Arial, sans-serif; color: rgb(0, 44, 81);">et de la
gestion du territoire</span></p>
<p><span
style="font-family: Arial, sans-serif; color: rgb(0, 44, 81);">Tél. :
819 823-8000 poste 2360</span></p>
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<p> </p>
<p> </p>
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<br>
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<pre class="moz-quote-pre" wrap="">_______________________________________________
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</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.
"De l'égo à l'égoût, il n'y a qu'une bouche mal refermée", André Isaac</pre>
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