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<div class="moz-cite-prefix">Lene,<br>
<br>
While I had been following DIY UAV effort for may years, I just
seriously started about 18 months ago. My goal was to be able to
reliably provide ortho-rectified high resolution imagery. Here
are some of things I've learned:<br>
<br>
1. It is possible to buy some off-the-shelf systems (e.g.
<a class="moz-txt-link-abbreviated" href="http://www.aeryon.com/products/avs/aeryon-scout.html">www.aeryon.com/products/avs/aeryon-scout.html</a>) but they can cost
$20K to $60k and are not "open" (on the other hand, they are very
reliable). 3DR (the commercial store for DiyDrones) has
cost-effective, open systems. They just released their
Iris/Pixhawk systems.<br>
<br>
2. The DIY Drones ecosystem is mostly populated with people who
just want to build, fly, and experiment with their own UAV
platforms (frame, powertrain and flight controller), but there a
few people interested in acquiring and processing UAV imagery as
well. Personally, I look at a UAV as [just] a camera positioning
system ;)<br>
<br>
3. Most of the software development effort in UAV image
processing comes from the "computer vision" space (e.g OpenCV).
Google "structure from motion" for more info on that type of
processing chain. I'm unsure if that method pays enough attention
to rigorous image geometry to produce accurate ortho-rectified
imagery. Maybe; at any rate I want DEMs and geotiffs as an end
result (I think) and that chain tends to produce non-georeferenced
3D models. And if you've got a few hours to burn reading current
research, google "UAV SLAM"...<br>
<br>
5. MicMac (<a href="http://logiciels.ign.fr/?-Micmac,3-"
style="text-decoration:none;"
id="docs-internal-guid-c1bf0be4-b138-b06f-f2fd-ad92ed4a2735"><span
style="font-size:15px;font-family:Arial;color:#1155cc;background-color:transparent;font-weight:normal;font-style:normal;font-variant:normal;text-decoration:underline;vertical-align:baseline;">http://logiciels.ign.fr/?-Micmac,3-</span></a>)
seems to use photogrammetric principles, is set up to use UAV
imagery, and is Open Source, but as I mentioned before the
learning curve is steep. Their user forum
(<a class="moz-txt-link-freetext" href="http://forum-micmac.forumprod.com/">http://forum-micmac.forumprod.com/</a>) has links to the user doc
(280 page PDF!) and some sample data to work thru the examples in
the user doc. Another possibility is OSSIM/OTB, and while their
algorithms are excellent, I don't think the software is set up to
deal with hundreds of images (bundle adjustment, etc), and it
doesn't produce DEMs (yet).<br>
<br>
6. Lots of R & D to be done yet. For example, using
RTK/Post-processing to calculate accurate camera centers (so no
ground control points necessary). Some models of the cheap UBLOX
GPS receivers can generate pseudo-range info, so RTKLib is a
possibility.<br>
<br>
Good Luck!<br>
<pre class="moz-signature" cols="72">Best Regards,
Brent Fraser</pre>
On 6/19/2014 9:29 AM, Lene Fischer wrote:<br>
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<p class="MsoNormal"><span
style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D"
lang="EN-US">Thanks for all the good links – I´ll now have
something to look into<o:p></o:p></span></p>
<p class="MsoNormal"><span
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lang="EN-US">Regards<o:p></o:p></span></p>
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<p class="MsoNormal"><b><span
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lang="EN-GB">Lene Fischer</span></b><span
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<p class="MsoNormal"><b><span
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lang="EN-GB">Department of Geosciences and Natural
Resource Management</span></b><span
style="color:#1F497D" lang="EN-US"><o:p></o:p></span></p>
</div>
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<p class="MsoNormal"><span
style="font-size:7.5pt;font-family:"Verdana","sans-serif";color:gray"
lang="EN-GB">University of Copenhagen</span><span
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<p class="MsoNormal"><span
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<p class="MsoNormal"><b><span
style="font-size:10.0pt;font-family:"Tahoma","sans-serif"">Fra:</span></b><span
style="font-size:10.0pt;font-family:"Tahoma","sans-serif"">
<a class="moz-txt-link-abbreviated" href="mailto:qgis-user-bounces@lists.osgeo.org">qgis-user-bounces@lists.osgeo.org</a>
[<a class="moz-txt-link-freetext" href="mailto:qgis-user-bounces@lists.osgeo.org">mailto:qgis-user-bounces@lists.osgeo.org</a>]
<b>På vegne af </b>Stefan Sylla<br>
<b>Sendt:</b> 19. juni 2014 04:39<br>
<b>Til:</b> <a class="moz-txt-link-abbreviated" href="mailto:qgis-user@lists.osgeo.org">qgis-user@lists.osgeo.org</a><br>
<b>Emne:</b> Re: [Qgis-user] OpenSource software for Drones<o:p></o:p></span></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal" style="margin-bottom:12.0pt">Even though
its not QGIS-related, but check this out:
<br>
<br>
<a moz-do-not-send="true"
href="http://wiki.paparazziuav.org/wiki/Main_Page"
target="_top">http://wiki.paparazziuav.org/wiki/Main_Page</a><o:p></o:p></p>
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<p class="MsoNormal">View this message in context: <a
moz-do-not-send="true"
href="http://osgeo-org.1560.x6.nabble.com/OpenSource-software-for-Drones-tp5146615p5146635.html">Re:
OpenSource software for Drones</a><br>
Sent from the <a moz-do-not-send="true"
href="http://osgeo-org.1560.x6.nabble.com/Quantum-GIS-User-f4125267.html">Quantum
GIS - User mailing list archive</a> at Nabble.com.<o:p></o:p></p>
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