Altitude, Focal length and elevated objects - What depends on what?

Elevated objects, like buildings, trees etc. can show strong displacement when you go too low with your platform.

Please enable Java for an interactive construction (with Cinderella).

Left-click point A (the principal point) and move it up and down, to see the effect of changes in focal length.

To see the effect of changes in altitude, select point A and B (the focal point) with shift-key down and left-click, then release the shift-key and move the whole camera up and down by dragging point A or B.