calculate_parameters func: Fixed Parameters

[Bin-ze]

calculate_parameters func have some fixed parameters:
Vertical FOV = 0.71
Horizontal FOV = 1.26
I compute this using:

  Horizontal FOV = Image_W / Image_focal

  Vertical FOV = Image_H / Image_focal

  GSD_to_AGL_CONST = Focal * Image_W / Sensor_w * 100, Folcal and Sensor_w using mm for units.

I want to know if my calculation formula is correct.
If it is correct, I cannot get the fixed value you calculated from this calculation method.
If it is wrong, what should be the correct calculation method?