GPR surveying method as a tool for geodetic verification of GESUT database of utilities in the light of BSI PAS128

Gabryś, Marta; Kryszyn, Katarzyna; Ortyl, Łukasz

doi:10.2478/rgg-2019-0006

Figures & Tables

Levels of accuracy of locating underground utility networks according to BSI (2014)

Draft of the location of the research and the arrangement of the pipes

Effects of integration of coordinates with echograms

Arrangement of measurement profiles on available cartographic materials

Figure 6

Scheme of detecting the profile of utilities based on the GPR method

Location of the baselines of the supplementary measurement relative to the hill with a 45% slope

Polarisation of the wave reflected from the R1 pipe

Figure 9

Classified echogram of the transverse trace – profile 12. Numbers of the areas marked on the echograms correspond to: 0 – eSA1; 1 – koD300; 2 – gnD300; 3 – gs90; 4 – eSA2, eSA3, eSA4; 5 – 3eSD; 6 – unidentified on cartographic materials utility line.

Figure 10

Echogram of the longitudinal trace – profile 10. The marked area of the occurrence of the eSA1 power line.

Figure 12

Echograms for the profile 12

3D model created based on 2D echograms (B-scan)

Vectorisation of the utility line axes based on the slice generated from the 3D model

Classification of quality levels (source: BSI (2014))

	Type of study	QL	Post-processing	Location accuracy		Additional data
				Horizontal¹	Vertical²
D	Desktop utility records search	QL-D	-	Undefined	Undefined	-

C	Site reconnaissance	QL-C	-	Undefined	Undefined	Location of underground utilities in relation to above-ground objects.

		QL-B4	No	Undefined	Undefined	A presumably existing object – it has not been detected despite the existing information.

B	Detection³	QL-B3	No	± 0.5 m	Undefined	Horizontal position of the object detected using one of the applied geophysical techniques.
		QL-B3P	Yes

		QL-B2	No	± 0.25 m or ± 40% of detected depth	±40% of ± detected depth	Horizontal and vertical positions of the object detected using one of the applied geophysical techniques.⁴
		QL-B2P	Yes

		QL-B1	No	± 0.15 m or ± 15% of detected depth	± 15% of detected depth	Horizontal and vertical positions of the object detected by several applied geophysical techniques.⁵
		QL-B1P	Yes
A	Verification	QL-A	-	± 0.05 m	± 0.025 m	Horizontal and vertical positions of the upper and/or lower part of underground utilities.

Errors of fitting MNK regression lines [m]

Method	gnD300	gs90	eSA₁	eSA₂	eSA₃	eSA₄	3eSD
GPR-MS50	0.15	0.21	0.17	0.17	0.11	0.13	0.12
Distance	0.14	0.17	0.14	0.15	0.15	0.15	0.09

Distances of regression lines relative to cartographic materials [m]

GPR-MS50 method	gnD300	gs90	eSA₁	eSA₂	eSA₃	eSA₄	3eSD
Min	0.41	-0.04	-0.04	-0.01	-0.01	-0.13	-0.22
Max	0.53	0.09	0.24	0.05	0.03	0.03	0.08
Mean	0.47	0.02	0.10	0.02	0.01	-0.05	-0.06

Distance method¹	gnD300	gs90	eSA₁	eSA₂	eSA₃	eSA₄	3eSD

Min	0.37	-0.14	-0.11	-0.23	-0.21	-0.25	-0.39
Max	0.46	0.09	0.16	-0.11	-0.11	-0.16	-0.10
Mean	0.42	-0.04	0.02	-0.17	-0.16	-0.20	-0.24

GPR surveying method as a tool for geodetic verification of GESUT database of utilities in the light of BSI PAS128

Figures & Tables

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Figure 15

Classification of quality levels (source: BSI (2014))

Errors of fitting MNK regression lines [m]

Distances of regression lines relative to cartographic materials [m]

Paradigm

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