For aerial photograph pair, the Orthophotomap of the image - overlapped region can be made by calculating directly spot height at image point.
对于航摄像对，可以直接通过像对解算像点的地面点高程，进而制作影像重叠区的正射影像。
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Orthophotomap has been increasingly used to practical production because it keeps rich aerial photograph information and has the feature of topographic map.