一种基于距离场的三维地质空间属性插值方法  

A Method of Three-Dimensional Geo-Spatial Attribute Interpolation Based on the Distance Field

作　　者：黄岸烁 张宝一[1,2] HUANG Anshuo;ZHANG Baoyi(School of Geosciences and Info-Physics,Central South University,Changsha,Hunan 410083;State Key Laboratoryof Geological Processes and Mineral Resources,China University of Geosciences,Wuhan,Hubei 430074)

机构地区：[1]中南大学地球科学与信息物理学院,湖南长沙410083 [2]中国地质大学地质过程与矿产资源国家重点实验室,湖北武汉430074

出　　处：《地质与勘探》2019年第6期1510-1517,共8页Geology and Exploration

基　　金：国家自然科学基金(编号:41772348、41302259)资助

摘　　要：针对根据一系列属性等值线剖面/断面数据进行三维空间插值问题,笔者提出一种基于距离场的三维空间属性插值方法。首先,根据对应属性等值线轮廓生成三维等值面;然后,构建属性等值面的三维距离场;最后,对于空间内任意点属性,根据其两侧等值面的距离场数据进行线性插值求取,从而生成整个三维空间内的属性场模型。将该方法应用于某铜矿区的可控源音频大地电磁法(CSAMT)剖面数据,在已知视电阻率等值线剖面的基础上,插值得到三维空间的视电阻率场,可用于揭示地下空间物性分布和预测隐伏矿体等。To solve the problem of three-dimensional spatial attribute interpolation according to the contours extracted from a series of section data,this work proposed a three-dimensional spatial attribute interpolation method based on the distance field.Firstly,the contour surfaces are generated according to the corresponding contour.Secondly,the three-dimensional distance fields of the corresponding contour surfaces are constructed respectively.Finally,the attribute of each voxel in three-dimensional space is determined by linear interpolation of distance fields of its two-neighboring contour surfaces,thus a three-dimensional spatial attribute field model is generated.This method has been applied to profile data from a controlled source audio-frequency magnetotelluric(CSAMT)survey in a copper mine,and the three-dimensional apparent resistivity field is generated based on known resistivity profiles,which can help reveal the physical attribute distribution of underground space and predict concealed ore-bodies.

关 键 词：距离场 属性场 插值 三维空间 CSAMT 铜矿区 

分 类 号：P628.3[天文地球—地质矿产勘探]