IFOV Method 1:
IFOV=Detector element size/Camera Focal Length.
IFOV Method 2:
IFOV=FOV/number of pixels in the direction of the FOV multiplied by[(3.14/180)(1,000)], where multiplying by [3.14/180)(1,000)] converts to mRad.
There is a value for IFOV in the X direction and the Y direction. Use the FOV for the X direction and the pixel elements value for X direction to get the IFOV in the X direction. Use the same method in the Y direction.