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Mobile LiDAR Data CollectionWorking in a True 3D Environment
APWA 2012 – Tampa, FL
Jason A. Waldemer, PLS, PS, RLSGeomatics Project ManagerMcKim & Creed, Inc.Tel: (813) 549-3740Cell: (770) 823-8322E-mail [email protected]
Gordon Perry, RPLS, PLSLiDAR Operations Manager
The HNTB Companies Tel: (816) 743-5747Cell: (512) 502-4194
E-mail [email protected]
MoDaC® (Mobile Data Collection) Surveying at the Speed of Innovation®
MoDaC® (Mobile LIDAR)
Mobile Scanning Components
Two 3D Laser ScannersTwo GPS UnitsOne Inertial Measurement Unit (IMU)One Digital Measurement Instrument (DMI)Two Digital Cameras
Dual Sensor System
Minimize laser shadowing
Optimize Field of View (FOV)
Sensor will see everything behind the vehicle
Sensor will see ~45º in front of vehicle
Full 360º area coverage, all sides captured
Sensor arrangement facilitates effective corridor mapping.
NCDOT - Proof of Concept 2009§ Capture hard surface data at highway speeds (up to 70 MPH)§ Vertical accuracies within 0.05’ (1/2” +-)§ Bridge Clearance Information§ Planimetric Features (pavement markings, signs, guardrails,
manholes, etc)
Why use MoDaC – Mobile Data Collection
Comprehensive Data (no go backs!)SafetySurveying in the Virtual WorldNon-Intrusive SurveyingDeliverables in Familiar Formats“Scan in the Can”
Mobile LiDAR ApplicationsRoadwaysStructuresRailroadsStreetscapesBeach ProjectsBridge AssessmentAsset ManagementUtility LocationAirports
Mobile Scanning – Obscure Areas
How Do We Achieve the Deliverables
A True 3D Environment
Mobile LiDAR Data CollectionWorking in a True 3D Environment
How can you collect Survey Grade data for Design projects faster, better and more cost effective?
LiDAR IS the answer!!
Click to edit Master subtitle style
APWA 2012Gordon Perry, HNTBApril 3, 2012
MOBILE Mapping in Engineering and Construction
Agenda
• Industry / HNTB Overview• Driving MM into Design & Construction• Examples of MM used for 3D Modeling• Managing the MM Data• Next Steps
Industry status Limited conditions and shrinking resources produce the need….
Do More• With less funding • With a quickness• While meeting (or exceeding ) spec
The answer “ INNOVATION ”
The INNOVATION responseMobile Mapping (MM) It has an enormous impact on design engineering workflowsThe MM business advantages:
• Faster, more cost effective than conventional methods• Higher level of “as-built” detail for 3D design efforts• Increased design confidence• Reduced errors and omissions• Reduced re-site visits for additional information
locations • Increased safety / reduced risk for field personnel
HNTB’s MM response • HNTB’s Incubation Center has focused R&D efforts on MM /
LiDAR• Formed a Data Acquisition Team (all team members are
licensed Surveyors)• Considered MM on more than 40 major projects• Collected MM on more than two dozen projects• Developed a “data management” solution• Engaged most U.S. based mobile mapping providers – we do
not own a LiDAR system
Driving MM into Design & Construction• Business Drivers• Technical Requirements
• Design• Construction
• Opportunities
Driving MM into Design & ConstructionBusiness Drivers• Limited funding sources • Compressed project schedules• Gradual acceptance of 3D design deliverables by owners• Alternative funding mechanisms for project delivery
Driving MM into Design & Construction
Technical Requirements - Design• Design grade deliverables require a detailed control network and rigorous
data adjustment• Performance and deliverable specifications
• Tiled, Classified, Geometrically Corrected data• Extraction of design
• Digital Terrain Models (DTM)• Bridge and structural features
• LiDAR Data availability for design team utilization• LiDAR Data formatted to suit design tools (MicroStation / AutoCAD)
Extraction workflow example
Extraction / model workflow example
Driving MM into Design & Construction
Technical Requirements - Construction• Potential use for construction phasing or as-built records• Accuracy will depend on needs
• Clearance data requires minimal control efforts• Terrain modeling will require more project control efforts
• Contractors utilizing 3D models for machine grading and grade checks will require MM data to be tied into their control network
Contours derived with MM data
Driving MM into Design & Construction
Opportunities• Effective 3D design is fed from MM data • MM operations save time and money for the contractor• MM operations are far safer than conventional methods
• Safety should be the highest priority with contractor partners• Image capture can be of high value (for potential litigation)• MM data can be used before, during and after construction• MM reduces the risk profile for entire team
Feeding the 3D Model• Engineers have committed to designing in 3D• The goal is to generate an “Integrated Model”
• LiDAR• Geotechnical• Utilities• Roadway surfaces• Bridges and structures• Grading tie-ins
• The complete 3D model is the source for all design decisions and construction support
Feeding the 3D Model• LiDAR plays a vital role in the development and continued refining of the
model• Data re-use is critically important throughout the project life cycle• Typically uses:
• Existing terrain and structural models• Structure clearances• Potential obstructions (signs, power lines)• Site access• Quantity take-off and measurement• Positioning traffic barriers for lane closures
Feeding the 3D Model
Where do you put all that data?One major draw-back to MM is the shear size of the data sets needed to be acquired for an infrastructure project:• Multiple passes on roadways• Over and under at grade separations• Images at high frame-ratesThe project team needs access to this information “on-demand”. This is not an easy task to accomplish
HNTB reviewed most of the offerings available on the marketIt was decided to attempt to build our own data storage system using:• Oracle Spatial for database and format (SDO_PC) • Amazon’s EC2 Cloud for storage• Silverlight as an interface for users
Where do you put all that data?
In Summary• Mobile Mapping is here to stay in design and construction• The uses are many• The impact is far reaching• The information isn’t better…..there’s just more of it now from the process
for less….allowing more informed decisions to be made for engineering and construction.
