重力近区地形改正精度探讨  

GRAVITY NEAR ZONE TERRAIN CORRECTION PRECISION DISCUSSION

作　　者：杨亚斌[1] 韩革命[1] 梁萌[1] 

机构地区：[1]中国地质科学院物化探研究所,河北廊坊065000

出　　处：《物探化探计算技术》2011年第1期92-96,122,共5页Computing Techniques For Geophysical and Geochemical Exploration

基　　金：国家"863"资助项目(2008AA06Z104);地质矿产调查评价项目(1212010050235)

摘　　要：在大比例尺重力勘探工作中,近区、中区地形改正误差对重力总精度影响较大。在实际工作中,近区域地形改正一般采用实测或用地形图读图计算;中区地形改正一般采用地形图读图计算,《大比例尺重力勘查规范》只考虑地形图高程精度对重力总精度的影响,忽略了地形图平面坐标精度对重力总精度影响。这里从锥形、扇形基本地形改正公式推导出发,探讨不同比例尺,不同高程,平面精度对重力总精度的影响,并提出了不同地形改正精度对地形图比例尺及高程,平面精度要求建议。Working in Large-scale gravity exploration,the influence of short range terrain correction and intermediate area topographic correction error on gravity precision is great.In reality,short range terrain correction is calculated on actual measurement or using relief map,and intermediate area topographic is calculated on using relief map,'The standard for large-scale gravity survey' only consider the influence of terrain elevation precision on gravity precision,but ignores the influence of relief map precision.On the basis of formula of terrain correction,we discuss the influence of scale,elevation and plane precision on gravity precision.We put forward some suggestions on the demand on scale,elevation and plane precision basis on terrain correction precision.

关 键 词：地形改正 高程精度 平面精度 比例尺 

分 类 号：P312[天文地球—固体地球物理学]