analog photogrammetry

topics/02_passive/index.md

@@ -39,6 +39,8 @@ However, it's essential to note that photogrammetry lacks inherent scale. Withou
 
 <p><img src="images/stereo_plotter.jpg" alt="StereoPlotter"></p>
 
+<p><img src="images/may_alexander_analog_photogrammetry.jpg" alt="Analog Photogrammetry"></p>
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 *Intrinsics and extrinsics parameters*
 Intrinsic parameters describe the properties of a camera's lens and sensor
 Extrinsic parameters describe the camera's position and orientation in 3D space
@@ -55,9 +57,7 @@ While the analog versions of these techniques have waned in popularity, stereoph
 When is it useful?
 Photogrammetry is useful for outdoors settings, where all you need is a handheld camera and some patience. In this example, note the loss of quality towards the top, as pixel resolution becomes problematic:
 
-<div class="sketchfab-embed-wrapper"> <iframe title="Arc de Triomphe - photogrammetry" frameborder="0" allowfullscreen="" mozallowfullscreen="true" webkitallowfullscreen="true" allow="fullscreen; autoplay; vr" xr-spatial-tracking="" execution-while-out-of-viewport="" execution-while-not-rendered="" web-share="" src="https://sketchfab.com/models/65937fd27de647c0a8ac99ce8275c03e/embed"> </iframe> <p style="font-size: 13px; font-weight: normal; margin: 5px; color: #4A4A4A;"> <a href="https://sketchfab.com/3d-models/arc-de-triomphe-photogrammetry-65937fd27de647c0a8ac99ce8275c03e?utm_medium=embed&amp;utm_campaign=share-popup&amp;utm_content=65937fd27de647c0a8ac99ce8275c03e" target="_blank" style="font-weight: bold; color: #1CAAD9;"> Arc de Triomphe - photogrammetry </a> by <a href="https://sketchfab.com/nicolasdiolez?utm_medium=embed&amp;utm_campaign=share-popup&amp;utm_content=65937fd27de647c0a8ac99ce8275c03e" target="_blank" style="font-weight: bold; color: #1CAAD9;"> Nicolas Diolez </a> on <a href="https://sketchfab.com?utm_medium=embed&amp;utm_campaign=share-popup&amp;utm_content=65937fd27de647c0a8ac99ce8275c03e" target="_blank" style="font-weight: bold; color: #1CAAD9;">Sketchfab</a></p></div>
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+<div class="sketchfab-embed-wrapper"> <iframe title="Arc de Triomphe - photogrammetry" frameborder="0" allowfullscreen mozallowfullscreen="true" webkitallowfullscreen="true" allow="autoplay; fullscreen; xr-spatial-tracking" xr-spatial-tracking execution-while-out-of-viewport execution-while-not-rendered web-share width="640" height="480" src="https://sketchfab.com/models/65937fd27de647c0a8ac99ce8275c03e/embed"> </iframe> <p style="font-size: 13px; font-weight: normal; margin: 5px; color: #4A4A4A;"> <a href="https://sketchfab.com/3d-models/arc-de-triomphe-photogrammetry-65937fd27de647c0a8ac99ce8275c03e?utm_medium=embed&utm_campaign=share-popup&utm_content=65937fd27de647c0a8ac99ce8275c03e" target="_blank" rel="nofollow" style="font-weight: bold; color: #1CAAD9;"> Arc de Triomphe - photogrammetry </a> by <a href="https://sketchfab.com/nicolasdiolez?utm_medium=embed&utm_campaign=share-popup&utm_content=65937fd27de647c0a8ac99ce8275c03e" target="_blank" rel="nofollow" style="font-weight: bold; color: #1CAAD9;"> Nicolas Diolez </a> on <a href="https://sketchfab.com?utm_medium=embed&utm_campaign=share-popup&utm_content=65937fd27de647c0a8ac99ce8275c03e" target="_blank" rel="nofollow" style="font-weight: bold; color: #1CAAD9;">Sketchfab</a></p></div>
 
 
 Key Benefits