What is the difference between Automatic Tie Points and Manual Tie Points in Pix4Dmapper?

 
Video: Watch the instructional video about Tie Points: here.

An Automatic Tie Points is a 3D point and its corresponding 2D keypoints that were automatically detected in the images and used to compute its 3D position.
A Manual Tie Point is a point without 3D coordinates that is marked by the user in the images. It can be used to asses and improve the reconstruction accuracy.

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