利用已有的丈量控制点对原地面高程进行放样，确定开挖深度。
By means of the existing measurement control points on the ground elevation for lofting, determine the excavation depth.
本文推导了星载测定外方位元素参与下，无地面控制点卫星摄影测量高程误差估算公式。
This paper deduces elevation error estimating formulae of the satellite photogrammetry, which is concerned with elements of exterior orientation that measured by spaceborne sensors.
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