What's the difference between frame digital aerial photography and linear aerial photography?

Frame-to-frame digital aerial camera system is an equivalent central projection image formed by geometric and radiation processing of images synchronously acquired by multiple cameras or multiple imaging detectors. The frame mark and frame coordinate system of linear aerial camera are on the lens box of aerial camera, and there is an attachment frame at the joint of objective lens barrel and cassette, and the four sides of the frame are strictly on the same plane.