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高程异常和垂线偏差是大地测量及空间技术中常用到的一组大地参数。精确计算大洋区这些参数的工作是十分困难的。本文以我国在中太平洋调查的一个海区为例,介绍了用重力法计算洋区高程异常及垂线偏差的基本公式、分区原则、资料来源、数据处理及程序设计等主要内容。讨论了计算误差的主要来源及提高计算精度的基本途径,分析了试算区大地水准面参数的展布特征。
Elevation anomalies and vertical deviations are commonly used in geodesy and space technology as a set of geodetic parameters. The exact calculation of these parameters in the oceanic region is very difficult. Taking a sea area surveyed by China in the Central Pacific Ocean as an example, this paper introduces the basic principles of gravitation method for calculating elevation anomalies and vertical deviations in the Western Pacific Ocean, the principle of zoning, data sources, data processing and programming. The main sources of calculation errors and the basic ways to improve the calculation accuracy are discussed. The distribution characteristics of geoid parameters in the trial area are analyzed.