海洋重磁测网判定测线相交的实用方法  

A practical method for determining the intersection of surveying lines in marine gravity and magnetic survey network

作　　者：廖开训[1] Liao Kaixun(Guangzhou Marine Geological Survey, Guangzhou 510075, Guangdong, China)

机构地区：[1]广州海洋地质调查局

出　　处：《地质学刊》2019年第2期296-300,共5页Journal of Geology

基　　金：中国地质调查局项目(121201002000179801,DD20189642)

摘　　要：在海洋重磁调查领域,判断测网中2条测线相交与否是重磁数据处理中需要解决的重要问题之一,目标是能够快速准确地确定交叉点的位置,从而计算出交点差。针对以往计算方法的不足,利用计算几何学中同一平面上线段相交的几何特征和计算方法,通过排斥判断和跨越判断2个步骤,对线段的相交与否进行判别,编写的程序逻辑简洁、实用,避免了数学错误。在实际应用中,提高了判断线段相交的效率和准确性,取得了良好的效果。In the field of marine gravity and magnetic survey, to judge whether two line segments intersect or not is one of the important problems to be solved in gravity and magnetic data processing, and the goal is to quickly and accurately determine intersection locations then to calculate the difference value. In this work, the geometric characteristics and computation method of line segments intersection on the same plane in computational geometry were quoted, and exclusion judgment and cross judgment were used to determine the intersection of two line segments. As a result, the logic is simple and the mathematical error is avoided. In practice, it can improve the efficiency and accuracy of the determination of line segments intersection, and has achieved good results.

关 键 词：交点 线段 排斥判断 跨越判断 矢量叉积 海洋重磁测网 

分 类 号：P738[天文地球—海洋地质]