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。
For aerial photograph pair, the Orthophotomap of the image - overlapped region can be made by calculating directly spot height at image point.
过滤是LIDAR数据预处理的重要步骤，过滤的目的是把LIDAR数据分成地面点和非地面点，它是获取高精度数字高程模型的关键。
The aim of the filtering of LIDAR data set is to divide the data set into ground points and non-ground points. The filtering of LIDAR data set is a crucial step to obtain the DEM with high precision.
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