区域重力调查中近区地形改正方法探究  

Study on Terrain Correction Method in Near Area in Regional Gravity Survey

作　　者：常金鑫 彭伍胥 王珍 刘贺楠 Chang Jinxin;Peng Wuxu;Wang Zhen;Liu Henan(Center for Geophysical Survey,China Geological Survey,Langfang,China)

机构地区：[1]中国地质调查局地球物理调查中心,河北廊坊

出　　处：《科学技术创新》2024年第2期24-27,共4页Scientific and Technological Innovation

基　　金：中国地质调查局《武威-银川地区区域地球物理调查》(编号:DD20230255)。

摘　　要：在重力调查中,影响重力调查精度的因素主要有测点重力值精度、测地数据精度和地形改正精度。随着科技不断的发展,重力仪器及测地仪器精度的不断提高,在排除人为操作错误的前提下,目前重力调查的数据精度更多的因素取决于地形改正的精度。尤其是在地形条件复杂和高差较大的山区及丘陵地区,能否取得准确的地形改正数据,已经成为重力测量值准确性的决定性因素。本文以野外山区试验点数据为例,以近区地形改正为重点研究对象,用三种方法(目估法、辅助仪器法、GNSS测高法)分别从精度、用时、效率及经济成本等方面进行了详细对比,总结了各种方法的优缺点,为区域重力调查选择合适的近区地形改正方法提供了较好的应用和示范效果。In gravity survey,the factors that affect the accuracy of gravity survey mainly include the accuracy of gravity value and geodetic data and terrain correction accuracy.With the continuous development of science and technology,the accuracy of gravity instruments and geodetic instruments continues to improve.Under the premise of excluding human error,the accuracy of gravity survey data depends more on the accuracy of terrain correction Especially in mountainous and hilly areas with complex terrain conditions and large elevation difference,whether accurate terrain correction data can be obtained has become a decisive factor for the accuracy of gravity measurement values.This paper takes the field measured point data in mountainous areas as an example,takes terrain correction in the near area as the key research object,and uses three methods(eye estimation method auxiliary instrument method GNSS altiometry method)to determine the accuracy respectively The time efficiency and economic cost are compared in detail,and the advantages and disadvantages of each method are summarized,which provides a good application and demonstration effect for selecting a suitable near-area terrain correction method for regional gravity survey.

关 键 词：重力调查 近区地形改正 目估法 辅助仪器法 GNSS测高法 

分 类 号：P631.1[天文地球—地质矿产勘探]