Reconstruction of ground penetrating radar backscatter of subsurface features for utility mapping

Ground Penetrating Radar (GPR) is one of the trenchless technologies; widely used for subsurface utility detection and mapping. However, in the context of subsurface utility mapping, constraints of achieving specific accuracy requirements so far have not been addressed by each system manufacturer an...

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Main Author:	Jaw, Siow Wei
Format:	Thesis
Language:	English
Published:	2013
Subjects:	G Geography (General)
Online Access:	http://eprints.utm.my/id/eprint/37807/5/JawSiowWeiPFGHT2013.pdf
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id	my-utm-ep.37807
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spelling	my-utm-ep.378072017-07-06T01:25:16Z Reconstruction of ground penetrating radar backscatter of subsurface features for utility mapping 2013-07 Jaw, Siow Wei G Geography (General) Ground Penetrating Radar (GPR) is one of the trenchless technologies; widely used for subsurface utility detection and mapping. However, in the context of subsurface utility mapping, constraints of achieving specific accuracy requirements so far have not been addressed by each system manufacturer and users. This research investigates the utilization of GPR for subsurface utility mapping, with the following specific objectives: (i) to design and built a calibration site for analysing locational and detectability accuracies of GPR; (ii) to examine and analyse the effects of GPR data acquisition approaches to the locational and detectability accuracies; (iii) to characterize GPR backscatter for recognition of utility’s material based on digital image processing techniques for retrieving the uniqueness of backscatters from respective utilities, and (iv) to examine and model GPR backscatters constraints for detecting and mapping stacked subsurface utilities in both vertical and horizontal orientations. Dual frequencies (250 and 700 MHz) GPR system was used in this study, experimented in both lab controlled and in-situ environments with settings of the system and scene parameters. Optimum values obtained in the lab for both system and scene parameters were then adopted for acquisition of data from in-situ measurement and also used in the Finite-Difference Time-Domain (FDTD) numerical modelling for validating the results of the study. Results of this study contributed three main findings: (i) the GPR locational and detectability accuracies for subsurface utility mapping are directly proportional to the data acquisition scanning techniques, where the ‘along-pipe’ scanning, which is rarely practised in the industry, yields the best locational and detectability accuracies, confirming to Quality Level A utility data; (ii) GPR backscatters with appropriate treatment can yield unique backscatter signature for recognition of utility’s material, hence, opening a platform for new valuable addition to the GPR application for utility’s material recognition besides utility detection and localization of buried utility; and (iii) the locational and detectability error trend and constraints of GPR measurements within crowded subsurface utility infrastructures yield a “best practice” procedure for determining the safe buffer zone for maintenance works; very crucial aspects in installation of new utility infrastructure and detecting aging utility. 2013-07 Thesis http://eprints.utm.my/id/eprint/37807/ http://eprints.utm.my/id/eprint/37807/5/JawSiowWeiPFGHT2013.pdf application/pdf en public phd doctoral Universiti Teknologi Malaysia, Faculty of Geoinformation and Real Estate Faculty of Geoinformation and Real Estate
institution	Universiti Teknologi Malaysia
collection	UTM Institutional Repository
language	English
topic	G Geography (General)
spellingShingle	G Geography (General) Jaw, Siow Wei Reconstruction of ground penetrating radar backscatter of subsurface features for utility mapping
description	Ground Penetrating Radar (GPR) is one of the trenchless technologies; widely used for subsurface utility detection and mapping. However, in the context of subsurface utility mapping, constraints of achieving specific accuracy requirements so far have not been addressed by each system manufacturer and users. This research investigates the utilization of GPR for subsurface utility mapping, with the following specific objectives: (i) to design and built a calibration site for analysing locational and detectability accuracies of GPR; (ii) to examine and analyse the effects of GPR data acquisition approaches to the locational and detectability accuracies; (iii) to characterize GPR backscatter for recognition of utility’s material based on digital image processing techniques for retrieving the uniqueness of backscatters from respective utilities, and (iv) to examine and model GPR backscatters constraints for detecting and mapping stacked subsurface utilities in both vertical and horizontal orientations. Dual frequencies (250 and 700 MHz) GPR system was used in this study, experimented in both lab controlled and in-situ environments with settings of the system and scene parameters. Optimum values obtained in the lab for both system and scene parameters were then adopted for acquisition of data from in-situ measurement and also used in the Finite-Difference Time-Domain (FDTD) numerical modelling for validating the results of the study. Results of this study contributed three main findings: (i) the GPR locational and detectability accuracies for subsurface utility mapping are directly proportional to the data acquisition scanning techniques, where the ‘along-pipe’ scanning, which is rarely practised in the industry, yields the best locational and detectability accuracies, confirming to Quality Level A utility data; (ii) GPR backscatters with appropriate treatment can yield unique backscatter signature for recognition of utility’s material, hence, opening a platform for new valuable addition to the GPR application for utility’s material recognition besides utility detection and localization of buried utility; and (iii) the locational and detectability error trend and constraints of GPR measurements within crowded subsurface utility infrastructures yield a “best practice” procedure for determining the safe buffer zone for maintenance works; very crucial aspects in installation of new utility infrastructure and detecting aging utility.
format	Thesis
qualification_name	Doctor of Philosophy (PhD.)
qualification_level	Doctorate
author	Jaw, Siow Wei
author_facet	Jaw, Siow Wei
author_sort	Jaw, Siow Wei
title	Reconstruction of ground penetrating radar backscatter of subsurface features for utility mapping
title_short	Reconstruction of ground penetrating radar backscatter of subsurface features for utility mapping
title_full	Reconstruction of ground penetrating radar backscatter of subsurface features for utility mapping
title_fullStr	Reconstruction of ground penetrating radar backscatter of subsurface features for utility mapping
title_full_unstemmed	Reconstruction of ground penetrating radar backscatter of subsurface features for utility mapping
title_sort	reconstruction of ground penetrating radar backscatter of subsurface features for utility mapping
granting_institution	Universiti Teknologi Malaysia, Faculty of Geoinformation and Real Estate
granting_department	Faculty of Geoinformation and Real Estate
publishDate	2013
url	http://eprints.utm.my/id/eprint/37807/5/JawSiowWeiPFGHT2013.pdf
_version_	1747816504720621568

Reconstruction of ground penetrating radar backscatter of subsurface features for utility mapping

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