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Author Topic: Does amount of matched points influence the model error?  (Read 2164 times)

Emicimoli

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Does amount of matched points influence the model error?
« on: July 03, 2015, 07:04:54 PM »
Hello dear everyone,

I am working on my master thesis project regarding snow mapping using UAV.
I am experimenting on some image pre-processing, after I process snow images i get like 30-40 % more matched points. I want to figure out if the quantity of points can influence the model error after georeferencing with DGPS points. I am getting a little lower error (like 1mm difference) is this possible or is maybe because when manual selecting gcps they where selected better?

Also, how does Photoscan calculates the error? I mean i know it calculates the difference between the GPS point and the estimated point by the model, but how does he define the estimated point? does it make an average of a set of points in the cloud?

I would really appreciate your help! Thanks in advance! :)
Best regards
Emiliano