Geospatial Engineering Problems & Solutions Associated With NDP Roads, Tunnelling & Civil Engineering Projects Use of HDS Leica Laser Scanners

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1 Geospatial Engineering Problems & Solutions Associated With NDP Roads, Tunnelling & Civil Engineering Projects Use of HDS Leica Laser Scanners

2 Laser Scanning Laser Scanning is a method of collecting large numbers of survey points in a relatively short space of time. The principle of measurement is the same as conventional EDM total station measurement technology in that the laser scanner emits a laser beam and then measures the angle and distance of the return laser beam by extremely accurately measuring of the time of the return laser beam. However a laser scanner can capture data at up to 500,000 points/second as opposed to single point measurements with a reflectorless total station. High definition 3D Laser Scanning is unparalleled in the capture of large numbers of points in a grid system that can be defined by the operator. The density of this point grid allows the analysis of deflection and movement in areas not possible to be determined by conventional methods. It is possible to create a surface model of the point cloud data that will accurately reflect the surface of the scanned area. Changes in the surface can be measured, analysed and compared to previous surveys and relative to a specific plane.

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4 HDS Laser Scanning Applications Fast, Accurate, Detailed Geometry Capture of Sites, Scene and Structures Building & Heritage As built 3D models As built 2D drawings Full colour visualisation Industrial Plant Intelligent 3D CAD as builts Revamp design clash detection Construction planning Civil & Survey Topographic road, rail surveys Volumes Tunnel surveys Forensics Crash investigation Collapse analysis Security planning

5 Architecture and Building Applications Producing 2D drawings or 3D CAD models for refurbishment and restoration projects Internal building surveys for floor plans 3D urban modelling for planning studies Detailed architectural scanning for preservation Construction QA and dispute resolution BIM (Building Information Models)

6 Architecture and Building Benefits Faster, safer, less costly, more accurate, and more complete building surveys Minimizes impact on use and operation of the building during survey Point clouds combined with full-colour imagery provide powerful, accurate visualization Better 3D city visualisation, planning and analysis Leverage AutoCAD and MicroStation CAD tools

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8 Heritage and Archaeology Applications Detailed recording and preserving of ancient monuments, archaeological sites and items of cultural heritage Production of drawings to aid restoration and reproduction work 3D data collection for movies and walkthroughs for virtual tourism applications within websites and DVD s

9 Heritage and Archaeology Benefits Faster, safer, less costly, more accurate, and more complete surveys of complex heritage sites Non-contact, remote survey reduces potential damage to sites and improves survey safety Reduces site visits needed for data capture Full-colour camera options add extra level of information to point clouds for richer analysis

10 Forensics Applications Road traffic accident surveys Crash and disaster analysis and management Crime scene investigation 3D modelling of police and military operational areas for security planning Benefits Faster, safer, less costly, more accurate, and more complete forensic & security surveys Does not disturb accident/crime scene Minimize road and site closure times for surveying Ability to survey at night Full-colour photography combined with point clouds adds an extra level of information

11 Civil: Earthworks and Mining Applications Volume calculations and cut/fill analysis for earthwork management of construction projects Stockpile and extraction measurements for quarries, open-cast mines, landfills Contours and DTM s for topographic mapping, drainage analysis and coastal monitoring 3D modelling and profiling of mines and tunnels Benefits Faster, more accurate, less costly, and safer volumetric and terrain surveys Remote measurement eliminates need to access hazardous areas Reduced site re-visits Automated comparisons between point clouds allows rapid analyses of different epochs of a monitoring programme

12 Civil: Infrastructure Applications Topographic and structure surveys Roads, bridges, tunnels, rail, airports, power distribution, telecom, and marine structures Construction QA & monitoring 2D maps, 3D models, DTM s Asset management, e.g., bridge clearances for truck route planning Benefits Faster, safer, less costly, more accurate, and more complete topographic & as-built surveys Ability to re-use data instead of returning to the site for additional surveying Minimize road, airport, etc. closures for surveying Ability to survey at night when asset may not be in use

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14 Civil: Road Scans Complete Data Set Captured First Time Redundancy in Data Eliminate Traffic Management Cost

15 N7 As- Built Bridge Survey

16 Unclean and Cleaned Data Survey Live, Busy Roads Anytime of the Day Quickly Remove Un-Wanted Data From the Road Surface Final Clean Data of Road Surface

17 Sections, Meshes and Output Create Cross Sectional Data Create Three-Dimensional Road Surfaces Full-Colour Camera Options and 3D Objects to Create Fly Through Presentations

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19 Dublin Port Tunnel

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21 10 Billion Points of Data Collected 3 HDS 4500 Scanners Used 10 Km of Tunnel Surveyed in 3 Days Ability to Scan in Total Darkness

22 Clash Detection using AutoCAD and Point Cloud Data

23 Speaker Clash with Kinematic Envelope

24 Civil: Sites Applications Topographic, site, planimetric surveys Commercial, public, residential properties 2D maps, DTM s Benefits Faster, safer, less costly, more accurate, and more complete site surveys Ability to re-use data instead of returning to the site for additional surveying Minimize site closures and impact on site construction and site operations during surveying Ability to survey at night when site is not in use

25 Civil: Rail Data Survey Rail Lines from Safety of Remote Locations Scan Live Railway Station. No Need to Close or Work During Closing Hours.

26 Civil: Structures Water Tower at Finglas

27 Water Tower Scan Scan from a Safe Distance from Structure Ability to Survey Remote Parts of the Water Tower Create Model I-Beams for Measurement Purposes

28 Types of Sites or Structures that Benefit from Scanning Complex geometry, surfaces Detail Congested, tight fits Far away or difficult to access Non-intrusiveness has benefit (e.g. avoid lane closures) Hard-to-reach or delicate surfaces Short windows to collect data Unsafe to occupy