In aerial photography, or photography in general: Is there a term for the point where the optical axis intersects the ground plane( scene)?
I think what you are looking for is the focal plane or plane of focus, which is distinct from the image plane that contains the film or sensor recording the scene. However, not all scenes contain elements that are all the same distance from the camera. Even in aerial photography unless the optical axis is perpendicular to the ground then some parts of the scene will be different distances than others. This is usually overcome by using a narrow enough aperture to provide a fairly deep depth of field.