大地位置正算问题 direct geodetic problem 大地位置指示器 ground-position indicator ..
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The direct geodetic problem is a very old one.
大地测量主题正算问题是一个古老的课题。
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When they are used for the direct geodetic problem of long distance, their computational efficiency is better than that of simple iterative means.
两种算法在长距离大地测量主题解算时，计算效率较简单迭代法均有所提高。
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