Because the aerial imagery is acquired by the way of vertical photography, the banking angle is very small, almost closing to zero, and the inner element is known.
由于航空遥感影像近似竖直摄影的特性，倾斜角非常小，几乎接近于零，而且内方位元素已知。
The same considerations apply to the correct banking Angle 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。
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