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<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'>There’s some or all of the functionality in GRASS, OSSIM,
E-FOTO, and the NASA Vision Workbench. Making it all work as a webservice
sounds tough to me. <o:p></o:p></span></p>
<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'><o:p> </o:p></span></p>
<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'>I think you’ll also have some challenges it that you
probably only have low resolution and quite possibly low accuracy orthoimagery to
control against, coarse (if any) DEMs, and a camera with a short focal length,
no fiducials or calibration report. I wonder if simple warping will get you
just about as far in terms of accuracy. <o:p></o:p></span></p>
<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'><o:p> </o:p></span></p>
<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'>At Random Hacks of Kindness I started on some code that used
SIFT to try to match UAV photos to control imagery and generate a GCP list that
could be fed into gdalwarp. The UAV imagery did have some rough GPS positioning
that limited the search space for the SIFT algorithm. It’s still (argh)
unfinished, but you can see the start here:<o:p></o:p></span></p>
<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'><o:p> </o:p></span></p>
<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'><a href="http://github.com/drwelby/UAV-Ortho">http://github.com/drwelby/UAV-Ortho</a><o:p></o:p></span></p>
<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'><o:p> </o:p></span></p>
<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'>-Marc Pfister<o:p></o:p></span></p>
<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'><o:p> </o:p></span></p>
<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'><o:p> </o:p></span></p>
<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'><o:p> </o:p></span></p>
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<p class=MsoNormal><b><span style='font-size:10.0pt;font-family:"Tahoma","sans-serif"'>From:</span></b><span
style='font-size:10.0pt;font-family:"Tahoma","sans-serif"'>
talk-bounces@openaerialmap.org [mailto:talk-bounces@openaerialmap.org] <b>On
Behalf Of </b>Jeffrey Warren<br>
<b>Sent:</b> Wednesday, February 17, 2010 8:36 AM<br>
<b>To:</b> geodata@lists.osgeo.org; talk@openaerialmap.org<br>
<b>Subject:</b> [OAM-talk] open source orthorectification for
grassrootsmapping.org<o:p></o:p></span></p>
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<p class=MsoNormal><o:p> </o:p></p>
<p class=MsoNormal>Hi all - I'm looking for an open source way to do automated
orthorectification as a web service to support <a
href="http://grassrootsmapping.org">http://grassrootsmapping.org</a> balloon/kite
mapping imagery. <o:p></o:p></p>
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<p class=MsoNormal><o:p> </o:p></p>
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<p class=MsoNormal>Something that would generate GCPs and stitch imagery, and
(even better) perhaps generate tiles. <o:p></o:p></p>
</div>
<div>
<p class=MsoNormal><o:p> </o:p></p>
</div>
<div>
<p class=MsoNormal>I'm a bit new to rectification, any suggestions?<o:p></o:p></p>
</div>
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<p class=MsoNormal><o:p> </o:p></p>
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<p class=MsoNormal>Thanks,<o:p></o:p></p>
</div>
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<p class=MsoNormal>Jeff<o:p></o:p></p>
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