structural survey, inspection and evaluation using ls technology
DESCRIPTION
A presentation by Michael Xinogalos, Surveying Engineer NTUA 1988, Technical Director of ASTROLABE ENGINEERING at Innovative LIDAR Solutions Conference - Toronto 2009 (www.astrolabe.gr - www.laseraction.eu)TRANSCRIPT
Innovative LIDAR Solutions Conference
June 24 - 26, 2009 - Toronto, Canada
Structural Survey, Inspection and EvaluationUsing Laser Scanner Technology
Michael XinogalosSurveying Engineer NTUA
ASTROLABE ENGINEERING / JGC
Terrestrial Laser Scanning projects
a. Bridge survey and structural deformation analysis
b. Railway tunnel survey and structural inspection in comparison to theoretical geometry
c. Survey and modelling of road interchanges for the design and evaluation of safety improvement measures
Axios river motorway bridge
Axios river motorway bridge
Axios river motorway bridge
Project tasks• Establishment of geodetic network (GGRS’87)• TLS survey with Optech ILRIS36D:
• 6 scanning positions (from newest bridge)• Average resolution 2-3 cm• Georeferencing: 6 scanning stations, 12 circular (d:50 cm) targets,
additional “natural” control points• Conventional survey for remaining details (southern side)• Basic processing of TLS data and other measurements• 3D features collection (deck geometry, piers, road level, etc)• Geometric evaluation and deformation analysis
Axios river motorway bridge
Processing and Results
Axios river motorway bridge
Processing and Results
Axios river motorway bridge
Processing and Results
Axios river motorway bridge
Processing and Results
Axios river motorway bridge
Processing and Results
Axios river motorway bridge
Processing and Results
Axios river motorway bridge
Agios Stefanos railway tunnel
Agios Stefanos railway tunnel
Agios Stefanos railway tunnel
Project tasks• Establishment of geodetic network (GGRS’87)• TLS survey with Optech ILRIS36D:
• 8 scanning positions (6 inside – 2 outside)• Average resolution 1-2 cm• Georeferencing: 8 conical targets, additional control points
• Conventional survey of ground surface above tunnel • Basic processing of TLS data and other measurements• 3D modelling of tunnel and ground above, H and V section extraction• Inspection in comparison to theoretical geometry
Processing and Results
Agios Stefanos railway tunnel
Processing and Results
Agios Stefanos railway tunnel
Processing and Results
Agios Stefanos railway tunnel
Processing and Results
Agios Stefanos railway tunnel
Processing and Results
Agios Stefanos railway tunnel
Processing and Results
Agios Stefanos railway tunnel
Project tasks (1/2)• Selection of “Reduced Safety” locations by the Maintenance Department
(Greek Ministry of Public Works)For each location:
• Establishment of geodetic network (GGRS’87)• TLS survey with Optech ILRIS36D
and lifting device:• Approx. 10 scanning positions • Average resolution 5-10 cm• Georeferencing: scanning stations,
conical targets
Survey and modelling of road interchanges for the design and evaluation of safety improvement measures
Project tasks (2/2)• Basic processing of TLS data and other measurements• Vector drawing and orthophoto creation as background for design• Design of safety improvement measures (additional lanes, vertical and
horizontal signage, changes in traffic regulation, closure of secondary roads, etc.)
• 3D modelling of design elements• Modelling of vertical signage (existing and new)• Generation of video fly - through and driving simulations (before-after)• Evaluation of design by the Maintenance Department
and Local Authorities
Survey and modelling of road interchanges for the design and evaluation of safety improvement measures
Processing and Results
Survey and modelling of road interchanges for the design and evaluation of safety improvement measures
Processing and Results
Survey and modelling of road interchanges for the design and evaluation of safety improvement measures
Processing and Results
Before After
Survey and modelling of road interchanges for the design and evaluation of safety improvement measures
Processing and Results
Survey and modelling of road interchanges for the design and evaluation of safety improvement measures
Any questions?Visit: www.astrolabe.gr www.jgc.gr
Conclusions…