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Photogrammetry Demo


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Photogrammetry Demo

  1. 1. Using Photogrammetry To Create 3-D As-built CAD Models
  2. 2. Site mobilisation: High resolution calibrated digital camera Reflectorless total station Self adhesive survey targets 2 man team
  3. 4. A control network is placed in prominent locations This enables the total station to be moved anywhere within the scope The working position is then calculated by the total station Targets for the local photogrammetry survey can now be placed
  4. 5. Pairs of overlapping photographs are taken.
  5. 6. This process is repeated for the entire scope of work.
  6. 7. Photogrammetry on site: <ul><li>can be highly accurate, up to ± 2mm. </li></ul><ul><li>is highly portable </li></ul><ul><li>can be non contact </li></ul><ul><li>uses inexpensive equipment </li></ul><ul><li>is a fast and efficient survey technique </li></ul><ul><li>will capture all visible objects from multiple angles ensuring complete coverage </li></ul><ul><li>can also be customised to suit special requirements </li></ul><ul><li>eg:- using in cell remote cameras </li></ul><ul><li>reverse calibration of existing video footage </li></ul>
  7. 8. The complete photographic survey is initially available as a visual database: <ul><ul><li>enables the ability to navigate, visualize and measure from survey coordinated high resolution photographs. </li></ul></ul><ul><ul><li>can be delivered within days of leaving survey </li></ul></ul><ul><ul><li>uses a simple 3D model to navigate </li></ul></ul><ul><ul><li>enables multiple viewpoints of same 3D point </li></ul></ul><ul><ul><li>all 3D coordinates measured are with respect to plant specific datum </li></ul></ul>
  8. 9. The complete photographic survey is initially available as a visual database: <ul><li>Benefits to Nuclear Industry: </li></ul><ul><ul><li>eliminate unnecessary site visits – ALARP </li></ul></ul><ul><ul><li>project staff based anywhere can take accurate measurements from photographs </li></ul></ul><ul><ul><li>provides accurate and irrefutable archive documentation </li></ul></ul><ul><ul><li>enables virtual planning of hazardous engineering operations </li></ul></ul><ul><ul><li>check legacy documentation for accuracy </li></ul></ul><ul><ul><li>define accurate scope for cost effective 3D modelling </li></ul></ul>
  9. 10. 3D CAD Modelling using the Visual Database
  10. 11. Corresponding points are digitised from left and right photographs
  11. 13. 3D CAD Model Specification driven modelling Delivered to any 3D CAD format Inc: AutoCAD, Inventor, Microstation, PDMS, Pro/E Asset tag names can be added from P&IDs, PFDs Built to customers requirements
  12. 14. 3D CAD Model <ul><li>Benefits : </li></ul><ul><ul><li>Eliminate site visits - ALARP </li></ul></ul><ul><ul><li>Suitable for all disciplines </li></ul></ul><ul><ul><li>± 5mm general accuracy within 3D model </li></ul></ul><ul><ul><li>Intelligent 3D models enable isometric/2D drawing production, material take off, etc </li></ul></ul><ul><ul><li>Use as a basis for all new design/demolition work </li></ul></ul><ul><ul><li>Enable virtual simulation and enhanced risk assessment of hazardous engineering operations </li></ul></ul>