3rd Annual   Optech ILRIS-3D Users Meeting         Rome, Italy - June 6-7, 2007    Efficient Road MappingModeling of Highw...
Applications• Highway survey and modeling (“as –built”  record, background for design and construction)• Airport tarmac mo...
“Korinthos – Tripoli” Highway•   Location: Central Peloponnesos, Greece•   Self Financing Project: Construction of a new h...
“Korinthos – Tripoli” Highway          Existing highway survey requirements•   Detail “as built” survey of all highway fea...
“Korinthos – Tripoli” Highway                         Project tasks (1/4)•   Establishment of geodetic infrastructure netw...
“Korinthos – Tripoli” Highway                            Project tasks (2/4)•   Critical issue for horizontal objects: lif...
“Korinthos – Tripoli” Highway                          Project tasks (3/4)•   Scanning resolution: 55mm @ 25m horizontal /...
“Korinthos – Tripoli” Highway                         Project tasks (4/4)•   Georeferencing refinement for elevations: usi...
“Korinthos – Tripoli” Highway  Point cloud vs TIN model / features
“Korinthos – Tripoli” Highway Background survey map (scale 1:500)
“Korinthos – Tripoli” Highway Background survey map (scale 1:500)
Athens International Airport  Evaluation of tarmac deformations at the 4 airplanemaneuver areas on either side of the E & ...
Athens International Airport                      Survey requirements• Positional accuracy: 1cm• Resolution: 5cm• Data cap...
Athens International Airport                              Project tasks• 6 to 9 scan positions per area (scanner on top of...
Athens International Airport                             Project tasks• Subsampling (3cm) and triangulation of data points...
Athens International Airport                             Project tasks• Creation of elevation map (contour spacing 2cm) (A...
Athens International Airport                            Project tasks• Cross section based analysis (ODOS software), repor...
Evaluation of safety improvement measures               in road intersectionsMinistry of Public Works – Maintenance Depart...
Evaluation of safety improvement measures               in road intersectionsMinistry of Public Works – Maintenance Depart...
Evaluation of safety improvement measures               in road intersectionsMinistry of Public Works – Maintenance Depart...
ConclusionsStatic Laser Scanning can be an efficient road mapping tool forprojects that require:• high accuracy• significa...
Any questions?Visit: www.jgc.gr   / www.astrolabe.gr
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Efficient Road Mapping

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A presentation by Michael Xinogalos, Surveying Engineer NTUA 1988, Technical Director of ASTROLABE ENGINEERING at 3rd Annual Optech Users Meeting - Rome 2007 (www.astrolabe.gr - www.laseraction.eu)

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Efficient Road Mapping

  1. 1. 3rd Annual Optech ILRIS-3D Users Meeting Rome, Italy - June 6-7, 2007 Efficient Road MappingModeling of Highways, Roads and Pavements using Laser Scanner Technology Michael Xinogalos Surveying Engineer NTUA ASTROLABE ENGINEERING / JGC
  2. 2. Applications• Highway survey and modeling (“as –built” record, background for design and construction)• Airport tarmac modeling and evaluation (maintenance)• Road intersection survey, design of interventions to improve safety, 3D modeling and integration, video simulations (evaluation of proposed measures)
  3. 3. “Korinthos – Tripoli” Highway• Location: Central Peloponnesos, Greece• Self Financing Project: Construction of a new highway section / Reconstruction and Maintenance of an existing highway section – J/V MOREAS• Existing Highway: Dual Carriageway, 2-3 lanes & shoulder
  4. 4. “Korinthos – Tripoli” Highway Existing highway survey requirements• Detail “as built” survey of all highway features (pavement, structures, slopes, signage, poles, etc.)• Efficient archiving of “as built” situation for future reference• Positional accuracy of georeferenced points: 2-3 cm• 3D model (TIN) for highway reconstruction design• Background survey maps (scale 1:500)• No traffic closure or delay• Efficient safety plan• Permits from local traffic authorities
  5. 5. “Korinthos – Tripoli” Highway Project tasks (1/4)• Establishment of geodetic infrastructure networks (triangulation, leveling, polygonometry), also necessary for construction• Static (stop & scan) laser scanning with Optech ILRIS36D• Scanner carried by a vehicle moving or standing always on the shoulder lane, protected by a traffic regulation trailing vehicle• Scanning from both sides of the highway, distance between scanning positions 50-80m
  6. 6. “Korinthos – Tripoli” Highway Project tasks (2/4)• Critical issue for horizontal objects: lifting the scanner (better scanning angle, improved object visibility, lower scanning resolution and / or fewer scanning positions required)• Lifting device used: Genie Super Hoist (5.6m, 113 kg capacity, CO2)• Custom modifications: Trailer integration, 5/8 bolt, longer ethernet and power cables, stabilizers, fuel generator & UPS, etc.
  7. 7. “Korinthos – Tripoli” Highway Project tasks (3/4)• Scanning resolution: 55mm @ 25m horizontal / 20mm @ 25m vertical• Pan-tilt base overlap set to maximum (20% overlap, 15 frames/3600)• Primary georeferencing: with conic targets (standard traffic cones: easy to install, measure and model), 1 cone (anchor point) per scan position required for sequential georeferencing (Polyworks IMAlign - IMInspect)
  8. 8. “Korinthos – Tripoli” Highway Project tasks (4/4)• Georeferencing refinement for elevations: using additional points measured with GPS on the shoulder lane white lines every 50-80m (Polyworks IMInspect)• Feature collection from pointclouds (Polyworks IMInspect)• 3D Modeling (TIN) from features and survey map creation (Autodesk Civil 3D)• Archiving for future reference: Subsampled pointclouds (5cm) per km (Polyworks IMView)
  9. 9. “Korinthos – Tripoli” Highway Point cloud vs TIN model / features
  10. 10. “Korinthos – Tripoli” Highway Background survey map (scale 1:500)
  11. 11. “Korinthos – Tripoli” Highway Background survey map (scale 1:500)
  12. 12. Athens International Airport Evaluation of tarmac deformations at the 4 airplanemaneuver areas on either side of the E & W air-corridors
  13. 13. Athens International Airport Survey requirements• Positional accuracy: 1cm• Resolution: 5cm• Data capture for each area within 6 hours• Tarmac 3D modeling• Elevation maps (contour spacing: 2cm)• Cross-section level analysis
  14. 14. Athens International Airport Project tasks• 6 to 9 scan positions per area (scanner on top of a car, tripod mounted),20% pan-tilt base overlap, distance between scans <50m• Georeference using conic and circular targets, measured from theairport’s geodetic control points• Creation of an aligned and georeferenced pointcloud for each area(Polyworks IMAlign and IMInspect)
  15. 15. Athens International Airport Project tasks• Subsampling (3cm) and triangulation of data points (PolyworksIMInspect), optimization and decimation of TIN model from 3 milliontriangles to <5000 triangles (Polyworks IMEdit, IMCompress)
  16. 16. Athens International Airport Project tasks• Creation of elevation map (contour spacing 2cm) (Autodesk Civil 3D)
  17. 17. Athens International Airport Project tasks• Cross section based analysis (ODOS software), reports• Evaluation of the results by the AIA authorities
  18. 18. Evaluation of safety improvement measures in road intersectionsMinistry of Public Works – Maintenance Department Current intersection layout – orthophoto from pointcloud Design of improvement measures – 3D modeling
  19. 19. Evaluation of safety improvement measures in road intersectionsMinistry of Public Works – Maintenance Department General layout fly-through Current layout Proposed layout
  20. 20. Evaluation of safety improvement measures in road intersectionsMinistry of Public Works – Maintenance Department Driving simulation – Direction from Messolongi to Antirrio Current layout Proposed layout
  21. 21. ConclusionsStatic Laser Scanning can be an efficient road mapping tool forprojects that require:• high accuracy• significant level of detail• total object recording for archiving and future reference• 3D modeling and motion simulation• safe data collectionDisadvantages:• productivity for long objects (e.g. highways) cannot exceed 500 to 800m ofsurveyed road per day (portability and scanning height are critical factors)• significant post processing work is needed, decimation is required to exportdata to transportation design software Mobile scanning systems with improved functionality willprovide a much faster and efficient alternative in the near future
  22. 22. Any questions?Visit: www.jgc.gr / www.astrolabe.gr

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