Ray cloud uncalibrated camera

[Pix4D_Alumni_MV]

Hi Nathan,

The All Prior options forces the optimization the internal parameters (principal point, focal length, distortions) to stay close to the initial values.
This option can remedy bad calibration in case that:

• The terrain is flat and there is no 3D information to facilitate the computation of the optimized camera parameters, which leads to ambiguity (multiple possible solutions).
• The project is bent after processing.
• The focal length is optimized far from the initial value, which also indicates ambiguity (example: the cameras are on the level of the model).

But apparently in your project it it did not help.
I am surprised to see that Aerial Grid causes this curvature.

I would suggest you this post as well:

Curved Output after initial processing

Hi Everyone,   Does anybody here also experience what have happened to me. The result is somewhat odd because the result show a very curved tie points. In reality it is a relatively flat terrain.   Please check on the attached pictures as your reference. I also attached the flight path to show that this only happens when the project area is like a rectangle which the length is much greater than the width, e.g. road, rivers. It is also my second time showing this odd result. With different da…

Which file are you talking about?

My recommendation would be here to do several tests on step 1 to see what are the best processing option for you data set. (it is difficult to give a ready to make recipe in photogrammetry. Sorry about that).

Best