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Bathymetric LiDAR – Lessons learned

Bathymetric LiDAR – Lessons learned. Andrew Flatman Rune Carbuhn Andersen Data Acquisition Danish Geodata Agency. Danish Geodata Agency - GST. Our earliest experiences with Bathymetrisk LiDAR – 21. Dec. 2007. Opportunity for Bathymetric test 2009-2012.

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Bathymetric LiDAR – Lessons learned

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  1. Bathymetric LiDAR – Lessons learned • Andrew Flatman • Rune Carbuhn Andersen • Data Acquisition • Danish Geodata Agency

  2. Danish Geodata Agency - GST • Our earliest experiences with Bathymetrisk LiDAR – 21. Dec. 2007

  3. Opportunity for Bathymetric test 2009-2012 Why ”Bringing Land and Sea Together”? • Goals: • Develop a product specification for maritime and terrestrial features • Develop a new vertical datum for the North Sea Region • Extensive testing of new airborne laser techniques in the coastal zone • Deploy, update and test metadatabase • Reasons: • North Sea nations handle geospatial data independently • Little integration of land and sea data • Lack of collaboration between countries • Increasing pressure on coastal areas • Threat of climate change and accelerated sea level rise WP3: Developing the Marine and Coastal Reference Base WP4: Harmonisation of Maritime Information WP6: Climate Change and Integrated Coastal Zone Management (ICZM)

  4. The GST interest in Bathymetric LiDAR • Supplementary Survey techniques… • 1. Closing the gap… • 2. Classification by waveform… • 3. Lakes and streams…

  5. Test areas • 3 different environments: • Rødby • Flensborg Fjord I & II • Hirtshals

  6. Challenges • Maturity – Operators / Systems • Local Environment – water and weather • http://marcoast.dmi.dk/

  7. Primary Goal – Closing the Gap (Flensborg Fjord) • Lots of rock • Hawkeye – deep scan • Chiropetera – high density

  8. Deep scan (3 sechi) vs High density (1 sechi) • High densitiy (1 sechi)

  9. Accuracy – control points: Usual check of topograhic LiDAR but Bathymetric LiDAR?

  10. Accuracy: control points and object detection

  11. Multibeam • Depth: 5 meter • 3 m • Deep scan (3 sechi) • Deep Scan - Hawkeye • High Density - Chiroptera

  12. Distribution Flyingheight: 400 meter 5 meter

  13. Distribution in Flensburg Data: • Back to simple point cloud:

  14. LiDAR • LiDAR bund • Multibeam bund • Density and penetration • LiDAR havoverflade • LiDAR bund

  15. Preliminary Conclusion and Lessons learned …. so far • Accuracy – Horizontal OK, Vertical assumenly OK • Density vs Object Recognition - ?? • Logistic – local environment – a constant challenge in Danish waters • Sofware and data processing tools for full waveform - challange • Great Model - plenty of use in Coastal Zone Management • But for charts ????

  16. The Road Ahead…. • Data analyze of Flensburg Fjord and Rødby - general QC • Object recognition • Cooperation with other organizations (BSH, …) • Evaluation of Bathymetric LiDAR for Danish Waters • Operational test in Greenland – 2015 • LiDAR Bathymetry for classification… • LiDAR Bathymetry for lakes and streams… • ……..

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