Mobile Lidar Workflow for Transportation Asset Mapping

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Brook Johnson
7 years ago
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1 Mobile Lidar Workflow for Transportation Asset Mapping Presented By: Judah Westby, Regional Sales Manager for SE Asia

2 Accurate 3D Mapping Solutions Aerial Mapping Airborne Bathymetric Mobile Static 3D

5 Lynx Hardware Overview Ladybug 360 camera integration 600-kHz scanner 600-kHz scanner Support for four 5-MP cameras 5

6 Laser Rep Rate vs. Mirror Scan Speed Other: Scanner 200hz, 500khz, 100km/hr Optech: Scanner 300hz, 500khz, 100km/hr

7 Understanding Project Cost Centers Survey Grade: Heavy in trajectory optimization and validation Mapping Grade: Heavy in data collection, processing and deliverables

12 Asset Information Group Asset knowledge is our most valuable asset. It drives effective investment decision making and efficient delivery, underpinning our high-performing and sustainable Strategic Road Network.

13 We maintain 35,300 Km of highway 150,000 technology assets and signs 12,100 Km of earthworks Highways England 33,800 Km of drainage 18,500 bridges and other structures 23,200 Km of guardrails

14 Benefits of Mobile Mapping survey data Inventory Better information leads to better decisions Improved quality of Highway England asset information Accurate locational asset information Imagery Up to date imagery to enable visualisation with confidence Up to date imagery to enable context for work LiDAR LiDAR enables accurate measurements from the desktop Re-use of the same LiDAR for many other purposes (mapping, condition etc) All together Safety Checks, analysis and verification Cost savings in the millions

15 Topographic Mapping 17

16 Surface Contouring & Profiling 18

17 Highway Geometry 19

18 Guardrail

19 Surfacing Defects 21

20 AVIS Asset Visualisation Information System Measure assets in 3D interactive environment View assets in imagery and GIS

21 Mobile Mapping Deliverables Imagery Georeferenced <50 cm, 2σ Jpeg 2560 x 2048 pixels (5 MP) 2m Spacing LiDAR Point Cloud Matched <3 cm, 2σ and Unmatched >500/ppm on the road surface Inter-point Spacing 10 cm for all trafficked lanes inc. hard shoulder (Matched only) Classified (Road Hard Surface) Intensity (16 Bit) Returns Positioning Absolute - <3 cm, 2σ / <1 cm, 2σ (where scheme ground control installed) 1 cm relative - <1 cm, 2σ

23 LMS: Integrated/Efficient Workflow Accurate Lidar Point Cloud Final Deliverables Generation Raw Lidar Data Raw Images Ground Control Points Post-processed trajectory LMS Calibrated Images Image Exterior Orientation Parameters Tightly coupled solution Camera Calibration Parameters Accuracy Assessment 25

24 Factors Affecting Accuracy Boresight Internal Cal Distribution Reference System Baseline GPS Bias Sensor Calibration Survey Control Processes Drift Navigation Solution Operational Best Practice Experience Precision FOV Laser Data Quality +/-2cm Absolute Accuracy Software Workflow Extraction Resolution Block Adjust

25 LMS: Understanding Major Error Sources Largest error source Project dependent Corrected with control Sensors have moving parts Survey grade data requires in-field calibration LMS Corrected with control provision Gps Trajectory Operator Expertise Sensor Internal Calibration Sensor Boresight LMS automatically refined using project data Automation helps Results should be predictable regardless of operator Alignment of sensors to IMU reference frame Ensures different sensors speak same language In field calibration important

26 Multiple-Mission Registration before

27 Multiple-Mission Registration after

28 Multi Pass Alignment in outage areas before after Statistics Before After Mean 15.4 cm 0.9 cm Std Dev 1.4 cm 1.4 cm RMS 15.6 cm 1.7 cm

29 Impact of Systematic Errors LMS Pro Lidar Quality Assurance Lidar Line 1 Lidar Line 2 Improvement of relative and absolute accuracy of the derived point cloud Lidar Control 33

31 LMS: Project Quality Assurance Individual lines with independent corrections Individual lines with independent corrections after polynomial correction Line 2 Line 4 Line 1 Line 3 Line 5 36

32 LMS for Quality Assurance: Mobile Rigorous calibration process Suitable features (planar surfaces) Automated Process (minimum user interaction) Lidar Self-Calibration Engine Robust, reproducible end result Practical/Reliable incorporation of control points Fully integrated in the data processing environment Robust trajectory error modeling Copyright 2015, Teledyne Optech. All rights reserved. E&OE 37

33 LMS for Quality Control Absolute/relative accuracy assessment Data check against control data Quality Control Tools Report generation/graphical analysis QC tools fully integrated in the data processing environment On-the-fly point could computation for accuracy assessment Copyright 2015, Teledyne Optech. All rights reserved. E&OE 38

35 RGB Extract New

36 LMS: Interoperability Output project data in compatible format to third party software TopoDOT, Terraphoto New 3.1

37 LMS: Interoperability Output project data in compatible format to third party software Orbit New 3.1

38 Lynx Delivers Highest Accuracy & Productivity Accuracy Designed for high accuracy on tough projects LMS driven: Lynx facilitates high accuracy data in potentially difficult urban environments Lidar Driven: Lynx Lidar characteristics facilitate high resolution at high speed Productivity Designed to reduce cost and complexity LMS features and use of control, Lidar rectification reduces cost of accurate surveying Batch and bundle adjustments Focused on service providers Application Lynx data facilitates better understanding of important assets High accuracy mobile surveys allows for a better understanding of important national assets like highways In office engineering, better field deployment Safe collection, less impact on traffic Copyright 2015, Teledyne Optech. All rights reserved. E&OE 43

39 Lynx SG Key Aspects Lynx SG Survey Grade Key Applications 1. Corridor surveying 2. Design engineering 3. High-accuracy projects Key Technical Features 1. Best-in-class lidar 2. Best-in-class navigation 3. Best-in-class imaging solution 4. Best-in-class postprocessing 5. LMS Pro Key Benefits 1. Execute high-accuracy projects 2. Project flexibility and upgradability 3. Low-cost deliverable generation 44

40 Thank You! Judah Westby Regional Sales Manager, Asia Pacific Optech Incorporated 300 Interchange Way, Toronto, ON CANADA, L4K 5Z8

Using Optech LMS to Calibrate Survey Data Without Ground Control Points

Using Optech LMS to Calibrate Survey Data Without Ground Control Points Challenge An Optech client conducted an airborne lidar survey over a sparsely developed river valley. The data processors were finding that the data acquired in this survey was particularly difficult to