The Computation Scheme and Computation Process for Gravity Correction Values within the Pure Spherical Coordinate System
详细信息
- 责任者：An Yulin (School of Geophysics and Information Technology ; China University of Geosciences ; Beijing 100083 ; China) ; Zhang Minghua
- 刊名：Geophysical and Geochemical Exploration
- 出版年：2010
- 卷期：34(6)
- 关键词：大地坐标系 ; geodetic coordinates ; 重力异常 ; gravity anomaly
- 页码：p.697-705
- 图表：1 illus., 2 tables, 2 refs.
- 分类号：1600
- issnNo：ISSN1000-8918
- isbnNo：CN11-1906/P
摘要
The computation project and computation process for gravity correction values within the pure spherical coordinate system are expounded in this paper. The excellences of this computing scheme are as follows: 1) by using observational point P as the center of the computation region and by using spherical surface distances am=am-1+Δa·bm-1 (m=2, 3, …, M) as the radius, the computation region is plotted out as M girdles. Then, by using Δλ0 as the angle interval of radials from P point, all girdles are plotted out as integral N parts.This scheme for plotting out the computation region is extremely precise and its computation precision is very high; 2) under the condition of complex terrain and remarkable different altitudes, the computation precision can be improved by minimizing values of Δa, b and Δλ0; and 3) the gravity correction values of very large surveying area will not be confined by the 6° cingulum and the standard map sheet and can directly be computed by using altitude values with longitude and latitude.