Topographic Correction of GPR Profiles Based on Laser Data

35th International Symposium on Remote Sensing of Environment

地球科学;生态环境科学

Zhang, Di^1 ; Zhong, Ruofei^1 ; Li, Jia Cun^1 ; Zeng, Fanyang^1

3D Information Acquisition and Application Key Laboratory, Ministry of Education, Capital Normal University, Beijing, China^1

关键词: Cross sectional profiles;    Distinctive layers;    Geologic cross sections;    GPR (ground penetrating radar);    Laser scanning systems;    Topographic correction;    Topographic data;    Vertical difference;   

Others  :  https://iopscience.iop.org/article/10.1088/1755-1315/17/1/012251/pdf
DOI  :  10.1088/1755-1315/17/1/012251

学科分类：环境科学（综合）

来源: IOP

【 摘 要 】

Data obtained by GPR (Ground Penetrating Radar) are displayed as a continuous cross-sectional profile. Surface, generally, is not flat. As a result, the image becomes distorted and the depth calculated from the surface no longer represents the true and exact position of electrically distinctive layers and objects in materials. In order to get real geologic cross section, GPR data must be corrected. This is paper discusses a new method using the color point cloud data obtained by a Vehicle-borne laser scanning system to compensate for elevation fluctuate. Elevation profile can be extracted from topographic data of survey site acquired using laser scanner, which can then be used to offset the error of GPR data. Through the discrete points in the survey line, each trace of the profile has its own elevation value showing a vertical difference from the reference profile with maximum elevation, then time shifts value of traces vertical offset versus the reference trace of profile can be obtained. At last, the results of topographic correction for radargrams that look extremely like the real geologic cross section are presented, which allows us to get a better profile interpretation and position of the objects and layers in the subsurface.