<html><head><meta http-equiv="Content-Type" content="text/html; charset=UTF-8"></head><body dir="auto"><div dir="auto">Hi Scott. A couple of technical points to consider:</div><div dir="auto">What is the accuracy of the imu on the camera? 0.1 degrees at 30 km results in a lot of error. </div><div dir="auto"><br></div><div dir="auto">Do you have the interior orientation of the camera? This is the lens distortion which makes up a critical part if the orthorectification process.</div><div dir="auto"><br></div><div dir="auto">The grass library has a number of ortho tools that may suite your purposes (i.ortho).</div><div dir="auto"><br></div><div dir="auto">Simple manual georeferencing may also meet your requirements.</div><div dir="auto"><br></div><div dir="auto">Feel free to reach out to me privately if you have any questions.</div><div dir="auto"><br></div><div dir="auto">Kirk Schmidt </div><div dir="auto">Nortek Resource Solutions Inc.</div><div dir="auto">kirk@ nortekresources.com</div><div dir="auto"><br></div><div dir="auto"><br></div><div dir="auto"><br></div><div dir="auto"><br></div><div dir="auto"><br></div><div id="composer_signature" dir="auto"><div style="font-size:85%;color:#575757" dir="auto">Sent from my Galaxy</div></div><div dir="auto"><br></div><div><br></div><div align="left" dir="auto" style="font-size:100%;color:#000000"><div>-------- Original message --------</div><div>From: "Madry, Scott via QGIS-User" <qgis-user@lists.osgeo.org> </div><div>Date: 2022-12-30 3:48 p.m. (GMT-04:00) </div><div>To: qgis-user@lists.osgeo.org </div><div>Subject: [Qgis-user] Airborne camera rectification </div><div><br></div></div>
<font class="" face="Arial">Hello list. First of all, thanks to all of you for helping make the QGIS community the very special thing that it is.</font>
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<div class=""><font class="" face="Arial">I will be involved in a stratospheric balloon launch in January </font><span class="" style="font-family: Arial;">(altitude ~30 km)</span><font class="" face="Arial">, and it will have a nadir-pointing RGB camera that
will have it’s images telemetered to the ground. It is nadir-pointing, but will have random swaying motion in all axes. Does anyone have experience in </font><span class="" style="font-family: Arial;">reading the 6 parameters of exterior orientation (X, Y,
Z, </span><span class="" style="font-family: Arial;">w, f, k</span><span class="" style="font-family: Arial;"> </span><span class="" style="font-family: Arial;">(Rotations about x, y, z axes respectively)) from the EXIF header attached to the JPEG and using
it to georectify the images as well as can be done in QGIS? We are hoping to compare the various images at different altitudes with satellite imagery acquired at about the same time.</span></div>
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<div class=""><span class="" style="font-family: Arial;">Thank you so much, and happy new year to everyone!</span></div>
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<div class=""><span class="" style="font-family: Arial;">Scott</span></div>
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<div class=""><font size="3" class="Apple-style-span"><span style="font-size: 12px;" class="Apple-style-span">Scott Madry, Ph.D.</span></font></div>
<div class=""><font size="3" class="Apple-style-span"><span style="font-size: 12px;" class="Apple-style-span">Research Associate Professor of Archaeology</span></font></div>
<div class=""><font size="3" class="Apple-style-span"><span style="font-size: 12px;" class="Apple-style-span">The University of North Carolina at Chapel Hill</span></font></div>
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<div class=""><font size="3" class="Apple-style-span"><span style="font-size: 12px;" class="Apple-style-span">Tel 1-919-448-4493</span></font></div>
<div class=""><font size="3" class="Apple-style-span"><span style="font-size: 12px;" class="Apple-style-span"><a class="" href="mailto:madrys@email.unc.edu">Email: madrys@email.unc.edu</a></span></font></div>
<div class=""><span class="" style="font-size: 12px;"><a class="" href="https://scottmadry.web.unc.edu">https://scottmadry.web.unc.edu</a></span></div>
<div class=""><font size="3" class="Apple-style-span"><span style="font-size: 12px;" class="Apple-style-span">Skype: scott madry</span></font></div>
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