The same considerations apply to the correct bankingAngle of a plane when it makes a turn in level flight.
当水平飞行的飞机转弯时，同样应有一定的倾斜，倾斜角的大小可按与上面相同的考虑来决定。
2
Because the aerial imagery is acquired by the way of vertical photography, the bankingangle is very small, almost closing to zero, and the inner element is known.