Update 20.1 - revised AT engine

Question

We are using Context Capture Desktop edition 20.1 V10.20.1.5562 and noticed that there have been some updates to the AT engine and an additional low level preset added. 
 
 Aerotriangulation: trust more input metadata when available. 
 Aerotriangulation: low level preset &ldquo;Maximum position metadata confidence.cfg&rdquo; to help with difficult linear projects when PPK or RTK positions are available. 
 
 I was hoping more information could be shared about these settings. What criteria needs to be met to trust the metadata? Is this position and orientation data from EXIF/imported data? Is position only sufficient? Is the metadata only trusted more when the low level preset is used, or does this happen automatically when metadata meets the criteria? 
 What is the difference between using the low level preset vs setting the AT to use Photo positioning metadata as an adjustment constraint as adjust/adjust within tolerance? 
 Thanks, 
 Jason.

Sylvain Lotteau · Accepted Answer

Hello Jason, 
 
 Aerotriangulation: trust more input metadata when available. 
 
 This modifiction will only have an effect if adjustement constraint on "photo positioning metadata" is selected in the AT settings. the photo positioning metadata can come from either EXIF information or imported from a CSV file. This update pushes back the threshold for which the engine consider (rightfully or not) that the photo positionning metadata is trustable or not. 
 
 Aerotriangulation: low level preset &ldquo;Maximum position metadata confidence.cfg&rdquo; to help with difficult linear projects when PPK or RTK positions are available. 
 
 This preset will only have an effect if adjustement constraint on "photo positioning metadata" is selected in the AT settings. This is basically a more drastic version of the default behaviour expalined in the bullet above. In this case, the engine will alsways consider the position metadata as trustworhty and will try to pull on the other parameters during the bundle adjustement. While this can help with the most difficult cases of curved AT, it can also introduce breaks if the input position is not 100% reliable. 
 
 I hope this helps ! 
 Sylvain

Update 20.1 - revised AT engine

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