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Commit ada45ba3 authored by Danny Griffin's avatar Danny Griffin
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testing

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## [Passive Scanning]({{ '/2_passive.html' | relative_url }})
## [Active Scanning]({{ '/3_active.html' | relative_url }})
## [Mechanical Digitization]({{ '/4_mechanical.html' | relative_url }})
## [Mechanical Digitizing]({{ '/4_mechanical.html' | relative_url }})
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# Photogrammetry
Photogrammetry is the collection and organization of reliable information about physical objects and the environment through the process of recording, measuring and interpreting photographic images and patterns of electromagnetic radiant imagery and other phenomena.
<p>Photogrammetry was first documented by the Prussian architect <a href="https://opus4.kobv.de/opus4-btu/files/749/db186714.pdf">Albrecht Meydenbauer</a> in 1867. Since then it has been used for everything from simple measurement or color sampling to record complex 3d <a href="https://en.wikipedia.org/wiki/Motion_field">motion fields</a>.</p>
Photogrammetry was first documented by the Prussian architect [Albrecht Meydenbauer](https://opus4.kobv.de/opus4-btu/files/749/db186714.pdf) in 1867. Since then it has been used for everything from simple measurement or color sampling to record complex 3d <a href="https://en.wikipedia.org/wiki/Motion_field">motion fields</a>.
<p><img src="images/data_model_photogrammetry.png" alt="Data Model of Photogrammetry"></p>
<img src="images/data_model_photogrammetry.png" alt="Data Model of Photogrammetry">
<p>A typical medium resolution aerial photogrammetry scan of a barn. With 50-100 images a reasonably accurate model can be produced. Such models are often used in surveying and restoration projects from the scale of hand helf objects to cities.</p>
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