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<p>Try adding -r bilinear or -r bicubic. By default gdalwarp
performs nearest resampling which is rarely what you need for high
quality results<br>
</p>
<div class="moz-cite-prefix">Le 01/02/2023 à 16:44, Elena Ruiz a
écrit :<br>
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<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal"><span lang="PT">Hi, I'm trying to reproject
images from WGS 84 / Pseudo-Mercator EPSG:3857 to ED50 / UTM
zone 30N EPSG:23030, but the resulting image doesn't adapt
well to drawing. I will explain it in more detail so that
you understand:<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="PT"><o:p> </o:p></span></p>
<p class="MsoNormal"><span lang="PT">I have an image in
EPSG:3857, the result of a WMTS service, and a drawing in
the same SRS, as you can see in the image the drawing
matches the image perfectly.<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="PT">Image source with drawing:
<a
href="https://aplitop.sharefile.com/d-s4d6dcf6d8ff34023a8b6e95277519c56"
moz-do-not-send="true" class="moz-txt-link-freetext">
https://aplitop.sharefile.com/d-s4d6dcf6d8ff34023a8b6e95277519c56</a><o:p></o:p></span></p>
<p class="MsoNormal"><span lang="PT"><o:p> </o:p></span></p>
<p class="MsoNormal"><span lang="PT">I want to convert the
previous image to EPSG:23030 and I have used gdalwarp
command with different parameters and I get the same result
:<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="PT"><o:p> </o:p></span></p>
<p class="MsoNormal"><span lang="PT">1</span><i><span
style="font-family:"Arial",sans-serif" lang="PT">.gdalwarp
-s_srs EPSG:3857 -t_srs EPSG:23030 -co "TFW=YES"
-overwrite "C:\Users\elena\Downloads\Nueva
carpeta\imagen_t.tif" "C:\Users\elena\Downloads\Nueva
carpeta\nueva_6.tif"<o:p></o:p></span></i></p>
<p class="MsoNormal"><span lang="PT">2.</span><i><span
style="font-family:"Arial",sans-serif" lang="PT">gdalwarp
-s_srs EPSG:3857 -t_srs EPSG:23030 -te 335000 4084501.25
335550 4084848.75 -co "TFW=YES" -overwrite
"C:\Users\elena\Downloads\Nueva carpeta\imagen_t.tif"
"C:\Users\elena\Downloads\Nueva carpeta\nueva_6.tif"<o:p></o:p></span></i></p>
<p class="MsoNormal"><i><span
style="font-family:"Arial",sans-serif" lang="PT"><o:p> </o:p></span></i></p>
<p class="MsoNormal">And the resulting image, in addition to
noticing that the road is distorted (like a staircase effect),
does not match the drawing.<o:p></o:p></p>
<p class="MsoNormal"><span lang="PT">Image destination with
drawing: </span><a
href="https://aplitop.sharefile.com/d-s98f76513feb34c268764c0492ccb40d3"
moz-do-not-send="true"><span lang="PT">https://aplitop.sharefile.com/d-s98f76513feb34c268764c0492ccb40d3</span></a><span
lang="PT"><o:p></o:p></span></p>
<p class="MsoNormal"><span lang="PT">Zoom of image destination:
</span><a
href="https://aplitop.sharefile.com/d-sf9a270a9300e4ac796eddeac7131a058"
moz-do-not-send="true"><span lang="PT">https://aplitop.sharefile.com/d-sf9a270a9300e4ac796eddeac7131a058</span></a><span
lang="PT"><o:p></o:p></span></p>
<p class="MsoNormal"><span lang="PT"><o:p> </o:p></span></p>
<p class="MsoNormal"><span lang="PT">I have also done the test
from EPSG:23030 to EPSG:25830 and it does not do well
either.<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="PT">I am using the version of
gdal 2.4.4 for x64, this is the link to download the source
and destination image:
<a
href="https://aplitop.sharefile.com/d-sdae2552bd2054fdf8cc29ce5b559e278"
moz-do-not-send="true" class="moz-txt-link-freetext">https://aplitop.sharefile.com/d-sdae2552bd2054fdf8cc29ce5b559e278</a>
, I hope someone can help me and tell me if there is
something wrong. Regards</span><o:p></o:p></p>
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<div style="LINE-HEIGHT: 13px" align="left"><span
style="FONT-SIZE: 9pt; FONT-FAMILY: Myriad Pro, Open
Sans, Arial"><strong>Elena Ruiz </strong></span><br>
<span style="FONT-SIZE: 7pt; FONT-FAMILY: Myriad Pro,
Open Sans, Arial">Sofware Development & Technical
Support<br>
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Pro, Open Sans, Arial">Tel. +34 952 43 97 71 <br>
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Sumatra, 9 - 29190 Málaga (Spain)<br>
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<pre class="moz-quote-pre" wrap="">_______________________________________________
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<pre class="moz-signature" cols="72">--
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My software is free, but my time generally not.</pre>
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