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<body class='hmmessage'><div dir='ltr'>The link Alain is referring to is Frank's Blog [http://fwarmerdam.blogspot.com/]. I just realized that I reply only to Alain, not to the gdal-dev.<br><br>Alain, we can see from your gdalinfo report that don't have RPC's on that file and even the GCP's that you have doesn't have height, so it's impossible to do ortho rectification and use the RPD_DEM parameter appropriately.<br><br><div><hr id="stopSpelling">Date: Wed, 19 Mar 2014 09:18:10 +0100<br>From: alain.sauter@univ-paris1.fr<br>To: gdal-dev@lists.osgeo.org<br>Subject: Re: [gdal-dev] gdalwarp _ RPC_DEM ignored ?<br><br>
<div class="ecxmoz-cite-prefix">Hi,<br>
<br>
thank you for your answer. I probably misunderstood the relation
between RPC and GPC.<br>
Ivan, thank you for the link, <br>
Dimitriy, I did not define any coefficient (i did'nt know that i
have to...).<br>
<br>
I used to orthorectify my photo with Erdas Imagine, wich was, in a
way, more easier : only define GPC, link a DEM and it was almost
done... <br>
<br>
Below is the output of gdalinfo,<br>
<br>
regards<br>
Alain<br>
<br>
<br>
<i>asauter@Z800:~$ gdalinfo /tmp/photo101.tif </i><i><br>
</i><i>Driver: GTiff/GeoTIFF</i><i><br>
</i><i>Files: /tmp/photo101.tif</i><i><br>
</i><i>Size is 12076, 11206</i><i><br>
</i><i>Coordinate System is `'</i><i><br>
</i><i>GCP Projection = </i><i><br>
</i><i>GCP[ 0]: Id=1, Info=</i><i><br>
</i><i> (10346.2,10558.6) -> (996517,6690260,0)</i><i><br>
</i><i>GCP[ 1]: Id=2, Info=</i><i><br>
</i><i> (10688.7,7989.49) -> (996604,6691840,0)</i><i><br>
</i><i><br>
</i><i>// some more GCP's here //</i><i><br>
</i><i><br>
</i><i>GCP[ 30]: Id=31, Info=</i><i><br>
</i><i> (3018.4,6207.98) -> (991844,6692570,0)</i><i><br>
</i><i>GCP[ 31]: Id=32, Info=</i><i><br>
</i><i> (9443.26,10907.6) -> (6659940,66900000,0)</i><i><br>
</i><i>GCP[ 32]: Id=33, Info=</i><i><br>
</i><i> (8409.41,7437.51) -> (995221,6692050,0)</i><i><br>
</i><i>Metadata:</i><i><br>
</i><i> TIFFTAG_DOCUMENTNAME=/Documents/photo101.tif</i><i><br>
</i><i> TIFFTAG_RESOLUTIONUNIT=2 (pixels/inch)</i><i><br>
</i><i> TIFFTAG_XRESOLUTION=72</i><i><br>
</i><i> TIFFTAG_YRESOLUTION=72</i><i><br>
</i><i>Image Structure Metadata:</i><i><br>
</i><i> INTERLEAVE=BAND</i><i><br>
</i><i>Corner Coordinates:</i><i><br>
</i><i>Upper Left ( 0.0, 0.0)</i><i><br>
</i><i>Lower Left ( 0.0,11206.0)</i><i><br>
</i><i>Upper Right (12076.0, 0.0)</i><i><br>
</i><i>Lower Right (12076.0,11206.0)</i><i><br>
</i><i>Center ( 6038.0, 5603.0)</i><i><br>
</i><i>Band 1 Block=12076x1 Type=Byte, ColorInterp=Gray</i><br>
<br>
<br>
<br>
<br>
<br>
On 18/03/2014 22:25, Dmitriy Baryshnikov wrote:<br>
</div>
<blockquote cite="mid:5328B9B1.50209@gmail.com">
<div class="ecxmoz-cite-prefix">Hi,<br>
<br>
the parameter may ignored because the input tiff lack the RPC
coefficients. Does any of RPC coefficient exist? What is
gdalinfo output of you aerial photos?
<pre class="ecxmoz-signature">Best regards,
Dmitry</pre>
18.03.2014 23:54, alain Sauter §á§Ú§ê§Ö§ä:<br>
</div>
<blockquote cite="mid:5328A489.9010701@univ-paris1.fr">
Hi all,<br>
<br>
I am trying to orthorectify a couple of aerial photos using
gdalwarp, but i am stuck with the <i>-to </i>transformer
option. I have seen in archive two request concerning this
issue, but without any answer for now... so hope this 3rd will
have a reply ;)<br>
<br>
materials :<br>
scan of an old aerial photo, without fly info and, of course,
without projection, tif format<br>
Dem of the region, tif format<br>
<br>
what i've done :<br>
using qgis georeferencer to grab some GPC's on the aerial photo<br>
using gdal_translate to insert GPC's in the aerial photo<br>
<br>
what i've try :<br>
<br>
using gdalwarp to transform, rectify and project the aerial
photo with :<br>
<i>gdalwarp -to RPC_DEM=dem.tif -t_srs=EPSG:2154 input.tif
output.tif</i><br>
<br>
result:<br>
my file is transformed and projected but not rectified. Option <i>-to
RPC_DEM </i>is ignored by gdalwarp, even if I write wrong
option like <i>-to RP_D...<br>
<br>
</i>Am i doing something wrong ?<br>
<br>
thanks for reply<br>
<br>
Alain <br>
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