Traditional Culture Encyclopedia - Photography major - How to explain the altitude in remote sensing? Detailed explanation of vertical projection and central projection of projector in remote sensing?

How to explain the altitude in remote sensing? Detailed explanation of vertical projection and central projection of projector in remote sensing?

The flying height (that is, the height of the photographic platform) refers to the distance from the objective lens of the camera to the reference plane when the average elevation plane of the photographic area is taken as the photographic reference plane.

Vertical projection (orthographic projection): If the projected rays are parallel to each other and perpendicular to the projection plane.

Central projection: If the projected rays converge at one point.