Why do tall buildings and trees sometimes look tipped over?
That happens because of camera perspective. If you look at a telephone pole from directly above, it’s a little circle. If you look at it from the side, it’s a vertical line. If you look at it from an oblique angle (from an airplane at a distance, say) it appears to be tipped over. Orthorectification will put the base of the tipped-over pole into its precise geographic location, but won’t turn it into a little circle.
