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<p>Conrad,</p>
<p>Try something like:</p>
<p>gdal_translate input.tif imagery.vrt -b 3<br>
</p>
<p>gdalwarp imagery.vrt imagery_warped.tif -geoloc -to X_DATASET=input.tif
-to X_BAND=2 -to Y_DATASET=input.tif -to Y_BAND=1 -to PIXEL_OFFSET=0
-to PIXEL_STEP=1 -to LINE_OFFSET=0 -to LINE_STEP=1 -to
SRS=EPSG:4326 -a_srs EPSG:4326 -overwrite<br>
</p>
<p>Obviously I have most certainly got something wrong in the above,
but hopefully with a tiny tweaking that should put you on the
right track.<br>
</p>
<p>Reference:
<a class="moz-txt-link-freetext" href="https://gdal.org/en/latest/development/rfc/rfc4_geolocate.html">https://gdal.org/en/latest/development/rfc/rfc4_geolocate.html</a><br>
</p>
<p>Even<br>
</p>
<div class="moz-cite-prefix">Le 18/10/2024 à 12:37, Javier Jimenez
Shaw via gdal-dev a écrit :<br>
</div>
<blockquote type="cite"
cite="mid:CADRrdKt0rxOUe+hAKPbEt_NjVtD5VKfmZZwt_G28BuYLsi=GoQ@mail.gmail.com">
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<div dir="ltr">
<div>Is it an actual grid? in the meaning of having constant
step size in X and Y.</div>
<div>In that case the geolocation is just the corner and the x
and y sizes. You can convert to a georeference raster, and
warp it.<br>
</div>
<div>If it is not the case, you have something more like a 2D
pointcloud, or a bunch of poins in a strange vector format.<br>
</div>
</div>
<br>
<div class="gmail_quote">
<div dir="ltr" class="gmail_attr">On Fri, 18 Oct 2024 at 12:20,
Conrad Bielski via gdal-dev <<a
href="mailto:gdal-dev@lists.osgeo.org"
moz-do-not-send="true" class="moz-txt-link-freetext">gdal-dev@lists.osgeo.org</a>>
wrote:<br>
</div>
<blockquote class="gmail_quote"
style="margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex">
<div>
<div
style="font-family:Helvetica Neue,Helvetica,Arial,sans-serif;font-size:16px">
<div dir="ltr">Hello GDAL-experts,</div>
<div dir="ltr"><br>
</div>
<div dir="ltr">normally when I use GDAL for reprojecting
imagery, the projection information that I use is the
source spatial reference (SRS) associated with the
imagery. However, now I have imagery which is lat/lon
geographic and I have two separate bands which also
carry the pixel geographic information. So the following
raster inputs all the same size:</div>
<div dir="ltr">1. Band 1 = latitude</div>
<div dir="ltr">2. Band 2 = longitude</div>
<div dir="ltr">3. Band 3 = imagery</div>
<div dir="ltr"><br>
</div>
<div dir="ltr">The question I have is how best to
integrate this information into a reprojection workflow?</div>
<div dir="ltr"><br>
</div>
<div dir="ltr">I presume that gdalwarp is the best option
here, but how can I take advantage of the individual
pixel location information (rather than just the extents
for example)? I know that I can mosaic into an existing
file that I have already created in the target
projection. Is this the best way to apply gdalwarp in
this context?</div>
<div dir="ltr"><br>
</div>
<div dir="ltr">I'm just wondering what is the best way to
integrate the lat/lon pixel information into my warping
using gdalwarp.</div>
<div dir="ltr"><br>
</div>
<div dir="ltr">Thanks in advance for your help,</div>
<div dir="ltr">Conrad<br>
</div>
</div>
</div>
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<br>
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<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.
Butcher of all kinds of standards, open or closed formats. At the end, this is just about bytes.</pre>
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