structural survey, inspection and evaluation using ls technology

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

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


Processing and Results


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

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



Before After


Any questions?Visit: www.astrolabe.gr www.jgc.gr

Conclusions…

structural survey, inspection and evaluation using ls technology

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