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。
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。
The solution of arc length of sectional ellipse for geodetic problem, which is based on the direct algorithm of meridian arc length is introduced in this paper.
介绍了利用子午线弧长的直接算法来解算大地问题中截面椭圆弧长的一种直接解法。
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