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<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D">Hi Gavin<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 have tried SfM (Agisoft Photoscan) with old imagery (1950s). I did discuss this very briefly with Aslam as well. The results were quite unsatisfactory because
of the quality of the source materials. Unfortunately the old imagery has lots of specs/dust/scratches/degraded film which confuses the software. And in the end it not orthorectified either.<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 have not done a thorough test though. And yes, the PhD student from UCT has done much more interesting and thorough tests than me
</span><span style="font-size:11.0pt;font-family:Wingdings;color:#1F497D">J</span><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">Hope that is not too OT.<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">W<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 lang="EN-US" style="font-size:10.0pt;font-family:"Tahoma","sans-serif";color:windowtext">From:</span></b><span lang="EN-US" style="font-size:10.0pt;font-family:"Tahoma","sans-serif";color:windowtext"> Africa [mailto:africa-bounces@lists.osgeo.org]
<b>On Behalf Of </b>Gavin Fleming<br>
<b>Sent:</b> 17 November 2016 09:47 AM<br>
<b>To:</b> Africa local chapter discussions<br>
<b>Subject:</b> Re: [OSGeo Africa] Georeferencing or overlaying old aerial photograph with cadastre<o:p></o:p></span></p>
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<p class="MsoNormal"><o:p> </o:p></p>
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<p class="MsoNormal">On 17/11/2016 08:47, Aslam Parker wrote:<o:p></o:p></p>
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<pre>We are looking into software that is specifically suited for orthorectification of historical imagery using DEM and patch rectification.<o:p></o:p></pre>
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<p class="MsoNormal">Have you considered SfM (structure from motion) for the historical imagery?
<br>
<br>
FOSS: <a href="https://opendronemap.github.io/">https://opendronemap.github.io/</a><br>
Proprietary: Pix4D, AgiSoft<o:p></o:p></p>
<p><o:p> </o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
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<p class="MsoNormal">-- <o:p></o:p></p>
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<p class="MsoNormal" align="center" style="text-align:center">Gavin Fleming - Joint MD - PrGISc [PGP1234]<o:p></o:p></p>
<p class="MsoNormal" align="center" style="text-align:center">Visit <a href="http://kartoza.com/" target="_blank">
http://kartoza.com</a> to find out about open source:<br>
* Desktop GIS programming services<br>
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<p class="MsoNormal" align="center" style="text-align:center">-------------------------------------------------------------------------------------------<o:p></o:p></p>
<p class="MsoNormal" align="center" style="text-align:center">Kartoza = Linfiniti
<span style="font-family:"Cambria Math","serif"">∪</span> Afrispatial<o:p></o:p></p>
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