Laser Scanning Surveying and Ground Penetrating Radar The Full Three Dimensional Picture Above and Below Ground

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1 Laser Scanning Surveying and Ground Penetrating Radar The Full Three Dimensional Picture Above and Below Ground

2 CIVILEX 2009 Mark Hudson, Director, Coastway, FInstCES MRICS MIS BTS Jeff Hott, Laser Scanning & Survey Manager, Coastway, BSc Dr James Hodgson, Senior Geophysicist, Minerex, Phd BSc

3 Laser Scanning Surveying & Ground Penetrating Radar The full 3 dimensional picture - above and below ground Bring the added deliverable benefits of surface topographical laser scanning to the underground world of utilities Surface laser scanning Ground Penetrating Radar 2D to 3D Sub-surface laser scanning The full picture - 3D model deliverable in 'real co-ordinates'

4 Coastway Ltd. Coastway are the leading Geospatial Engineering surveying company in Ireland covering the following sectors: Geospatial Engineering High Definition Laser Scanning Structural Monitoring Environmental Monitoring Ground Penetrating Radar 3D Modelling & Visualisation Minerex are leading Ground Penetrating Radar geophysicists

5 Minerex Geophysics Ltd. Minerex Geophysics Ltd. are a specialist geophysical and utility mapping consultancy. Our experienced geophysical staff have over 20 years experience in all aspects of geophysical surveying and consultancy. Geophysical Services Consulting Surveying Data Processing Interpretation Reporting Project Management Dr. James A. Hodgson Unit F4, Maynooth Business Campus, Maynooth, Co. Kildare, Ireland TEL: FAX: e mail: Info@mgx.ie

6 Ground Penetrating Radar GPR is an electromagnetic (EM) geophysical method which is non destructive EM energy is transmitting into the ground and a receiver measures energy that is reflected back to the surface from a buried body or interface Very useful for locating buried object pipes, ducts, watermains, gas lines etc and defining subsurface structures.

7 GPR Principle of Operation

8 Top 400 MHz, Bottom 900 MHz GPR 2D Example section

9 Minerex Geophysics Ltd operates a GSSI SIR 3000 system 400MHz Antenna in hand towed configuration In average Irish soil conditions penetrates to 1 1.5m, possibly 2.5 3m GPR Equipment

10 GPR Equipment Minerex Geophysics Ltd operates a GSSI SIR 3000 system 270MHz antenna ~ 4 5m penetration 100 MHz 6 9m penetration

11 GPR Grids

12 GPR Geological Mapping

13 GPR Cavity/Void Detection

14 GPR Basements/Coal Stores

15 GPR 3D Depth Slice GPR data collected in a series of profiles / grid data can be processed as a series of depth slices or as a 3D data Cube.

16 GPR Utility Map

17 3D GPR CAD Image

18 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.

19 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

20 Utility Chamber Surveys Applications Providing accurate measurable point cloud data Condition surveys of the access chambers Incoming/Outgoing pipe locations with diameters

21 Previous Methods Photographic Evidence Sketches Confined Area Training 2D Plan Drawings

22 HDS Scanning Method Applications HDS 6000 Laser Scanner Phased base scanner with the ability to scan 500k points per second. Inverted Tri-pod Lower the scanner to between 3 and 4 metres Remote Access Control the scanner by cable or by wireless connection

23 Utility Chamber Surveys Benefits Faster, safer, more accurate, and more complete surveys of underground chambers Non-contact, remote survey reduces potential health and safety risks and improves survey safety Reduces site visits needed for data capture Full-3D point cloud dataset

24 Above and Below Ground Data Complete Survey Redundant Data Set

25 Above and Below Ground Data

26 Deliverables Point Cloud Data Cloudworx Other Software; GeoMagic, Pointools, etc ASCII Data X,Y & Z Coordinates Tab, Space or Comma Delimited Modelled Pipe Runs Automatic Pipe Creation Combine GPR and Laser Scan Data Cross Sections Create Sections to Specific Thickness Step Through Data for Analysis Quickly Generate CAD Linework Modelled Surfaces Model Point Cloud Data such as Roads, Buildings and Footpaths Generate Grid of Levels 2D and 3D Drawings Simple Plan Drawings Create 3D Linework of Features Overlay Point Cloud with OSI Data Video Flythru s Presentations Planning TruViews Extract Real 3D Coordinates Easy to Use Free to End User

27 3D Modelled Pipes

28 Cross Sections

29 2D Plan Drawings

30 3D Drawings

31 Modelled Surfaces Mesh Model Created From Laser Scan Point Cloud Data Grid of Points at 100mm Spacing Created From The Mesh Model

32 TruView Extract Real 3D Coordinates Accurately Measure Distances Save And Share Views And Mark-ups Easy Measuring, Markups and Hyperlinks View TruView File Sets Locally Or Via The Web TruView Is Available As A Free Download

33 TruView

34 Contact Details Toughers Business Park Newhall Naas, Co. Kildare, Ireland TEL: FAX: Unit F4, Maynooth Business Campus, Maynooth, Co. Kildare, Ireland TEL: FAX: