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Application of Post-Processed Navigation, Motion and Tide Data to Multibeam Surveys using Applanix POS/MV Dushan Arumuga

Application of Post-Processed Navigation, Motion and Tide Data to Multibeam Surveys using Applanix POS/MV Dushan Arumugam Doug Lockhart Carol Lockhart Fugro Pelagos, Inc. Outline. Introduction Problem The need for a reference surface to verify LIDAR data Solution

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Application of Post-Processed Navigation, Motion and Tide Data to Multibeam Surveys using Applanix POS/MV Dushan Arumuga

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  1. Application of Post-Processed Navigation, Motion and Tide Data to Multibeam Surveys using Applanix POS/MV • Dushan Arumugam • Doug Lockhart • Carol Lockhart • Fugro Pelagos, Inc.

  2. Outline • Introduction • Problem • The need for a reference surface to verify LIDAR data • Solution • Multibeam hydrographic survey based data • Details • Data Acquisition • Data Processing

  3. Outline Continued • Results • Positioning (DGPS vs KGPS) • Attitude and Heading (Real-Time vs Post-Processed) • Tide / PPK Altitude • Conclusion

  4. LIDAR

  5. Location Map

  6. Base Station Configuration • Base Station Equipment • Novatel Dual Frequency GPS • Receiver (Model DL-4) • Antenna (Model 503)

  7. Vessel Configuration • Vessel Equipment • Reson Seabat 8101 • Dual Frequency POS/MV 320 • AML SVP Probes • Triton ISIS Data Acquisition software

  8. Acquisition Layout

  9. Processing Layout

  10. Horizontal Datum • Horizontal Datum • North American Datum 1983 (NAD83) • KGPS based • DGPS based

  11. Positioning • Positioning • DGPS vs KGPS

  12. Effects of Positioning Error

  13. Post-Processed Attitude

  14. Post-Processed Heading

  15. Vertical Datum • Vertical Datum • International Great Lakes Datum 1985 (IGLD85) • Ellipsoid Elevations

  16. Tide • Multibeam Hydrographic Data (IGLD85) • Squat Settlement • Vessel Draft • Water level • Seiche • Tide Prof. Robert A. DalrympleCenter for Applied Coastal ResearchUniversity of DelawareNewark, DE 19716

  17. Tide Curve (Toronto)

  18. Results Tide (Profile) Profile showing data with Tide correction from the Toronto Tide Gauge

  19. Ellipsoid Height • Multibeam Hydrographic Data (Ellipsoid) • PPK Altitude

  20. PPK Altitude

  21. TrueHeave

  22. Residual (Altitude minus TrueHeave)

  23. Smoothed Residual

  24. Tide Gauge Data

  25. Results PPK (Profile) Profile showing data with PPK Altitude correction

  26. Results Tide vs PPK (Profile) Profiles showing data with Tide and PPK Altitude correction

  27. Sun Illuminated Image

  28. Conclusion • Post-Processed Kinematic altitude appears to reduce our vertical error • Tide file did not provide a good comparison due to the Seiche effect • Is currently being used on our NOAA Project where better tide models are available

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