ARKit confidence level and precision 3D model (BIM)

Hi, I want to develop an AR App for construction site on which i need to prove the calibration quality of the 3D model on plane. For that i have already retrieve informations like TrackingState, points cloud, confidence map...

I would like to know if the ConfidenceLevel, that appears to be an enumeration, is available or if I need to analyse the points cloud to make my own confidence level.

And also if you have informations on how can I know the precision of the 3D map on real life.

ARKit confidence level and precision 3D model (BIM)
 
 
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