traditional versus new: smartphone versus profiler wix.pdf · location test speeds (km/h)...
TRANSCRIPT
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Traditional versus new: Smartphone versus profiler
by Richard Wix
RPUG , San Diego3 November 2016
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Information quality levels
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the deviations of a surface from a true planar surface with characteristic dimensions that affect vehicle dynamics, ride quality, dynamic loads, and drainage, for example, longitudinal profile, transverse profile, and cross slope (ASTM 2015).
Roughness (smoothness)
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International roughness index (IRI)
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Need to ensure….
5
Not….
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Inertial profiler
Accelerometer: A
Computer
1. Inertial Reference
2. Height Relative to Reference (laser, infrared, or optical transducer)
3. Speed/Distance Measurin System
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Ground truth measurements
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Roughometer III
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Smartphone App
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Site Number
Location Test speeds (km/h)
Sealed/Unsealed Length (km)
1 Nar Nar Goon repeatability loop 60, 80, 100 Sealed 8.8
2 Nine Mile Road 40, 60, 80 Sealed 1.5
3 Convent Road 40, 60 Unsealed 3.9
4 Daly Road 40 Unsealed 2.8
Test sites
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The trial
11
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Reproducibility
Nar Nar Goon validation loop 80 km/h
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Reproducibility (accuracy) statistics
Site Speed (km/h) Statistics Rougho‐
meter IIISmartphone
eIRI cIRI
Nar Nar Goon 60 r2 0.98 0.19 0.40
Slope & intercept 0.98, 0.03 0.14, 1.05 0.33, 0.90
80 r2 0.96 0.22 0.38
Slope & intercept 1.05, ‐0.03 0.21, 1.08 0.42, 1.03
100 r2 0.93 0.31 0.55
Slope & intercept 1.18, ‐0.17 0.33, 1.08 0.60, 0.95
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IRI variation with speed for Smartphone
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Reproducibility (accuracy)
Convent Road Westbound 60 km/h
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Site & direction Speed (km/h)
Statistics Rougho III SmartphoneeIRI cIRI
Convent Road (EB) 40 r2 0.89 0.12 0.06Slope & intercept 0.98, 0.08 1.17, 1.94 0.36, 2.91
60 r2 0.96 0.53 0.39Slope & intercept 0.99, ‐0.03 0.77, 0.51 0.57, 1.78
Convent Road (WB) 40 r2 0.89 0.14 0.10Slope & intercept 0.86, 0.39 1.10, 3.14 0.43, 3.15
60 r2 0.95 0.50 0.32Slope & intercept 0.86, 0.29 0.62, 0.85 0.44, 2.22
Reproducibilty (accuracy) statistics
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Site Speed (km/h)
Statistic 2LP Rougho III Smartphone
eIRI cIRI
Nar Nar Goon loop 60 r2 0.98 0.98 0.86 0.86
COV (%) 4 4 5 9
80 r2 0.98 0.98 0.88 0.87
COV (%) 4 5 7 10
100 r2 0.98 0.97 0.88 0.89
COV (%) 5 5 7 9
Repeatability
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Repeatability ‐ RIII
Nar Nar Goon loop 80 km/h
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Repeatability ‐ RoadRoid
Nine Mile Road Northbound 80 km/h
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Repeatability ‐ RIII
Nine Mile Road Northbound 80 km/h
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Repeatability
Site Speed (km/h)
Statistic 2LP Rougho‐meter III
SmartphoneeIRI cIRI
Nine Mile Road (SB) 40 r2 0.99 0.99 0.86 0.88COV (%) 3 4 4 8
60 r2 1.00 1.00 0.94 0.88COV (%) 2 2 4 8
Nine Mile Road (NB) 60 r2 1.00 1.00 0.93 0.92COV (%) 3 2 5 9
80 r2 0.99 0.98 0.94 0.91COV (%) 4 4 9 11
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Repeatability ‐ Roughometer III
Convent School Road Eastbound 60 km/h
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Corrugations
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Device Reproducibility Repeatability Portability Functionality Distance
Smartphone
Roughometer
Inertial profiler
Comparing factors
Device Reproducibility Repeatability Portability Functionality Distance
Smartphone 3 3 1 2 3
Roughometer 2 2 2 3 1
Inertial profiler 1 1 3 1 1
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And the winner is…..
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But……
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Or……
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Or maybe…..
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• Measuring IRI• Accuracy• Repeatability• Deterioration
modelling• Distribution of
funding• Monitoring trends• Quality control
However, if I’m interested in…..
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Conclusions
• Laser profiler: IQL1/2• Roughometer: <IQL3• RoadRoid: IQL4/5
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Inertial profilers are the greatest!
Inertial profilers are the greatest!