What is the orientation in photogrammetry?

Internal orientation is to restore the relative position between the photo and the camera according to the frame coordinates (corner frame and frame) of the photo and the verification parameters of the corresponding camera, that is, to establish the photo coordinate system on the encryption collector.

Automatic internal orientation can be achieved by importing the frame coordinates of the photo and the verification parameters of the corresponding camera, but in order to grasp it easily, manual internal orientation is generally needed.