Why should the image sensor always be placed in the back focus of the camera during aerial photogrammetry?

1, the focal length of the camera refers to the distance from the optical center of the lens to the image plane. In photogrammetry, a long focal length camera is usually used, because a long focal length can produce a larger field of view, thus obtaining more detailed image information.

2. In photogrammetry, high-resolution images are usually needed to obtain accurate measurement data. Putting the image sensor in the back focus of the camera can ensure that the image sensor is aligned with the optical center, thus obtaining the best resolution.