似大地水准面的定义及在空中测量中涉及的问题

Title definition of quasi-geoid and some questions encountered in airborne gravimetry

本文讨论了高程异常和似大地水准面的定义以及高程异常随空间位置的变化,提出了将似大地水准面称为正常高系统的高程基准面的不恰当性,给出了由地面测量至空中点几何高差确定空中点正常高的改正方法。其目的主要是针对当前已经扩展到了空中的测量,引导正确地认识正常高系统的基本问题。

In this paper the definitions of height anomaly and quasi-geoid as well as the variation of height anomaly with respect to spatial location are discussed.Aiming at the emerging airborne gravity measurement,the author demonstrates the improperness of setting the quasi-geoid as the datum of normal height system,and presents the method of the normal height determination of a point at some altitude from the geometric height difference between ground observation and the point at some altitude.