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German Project Laserbathymetry

German Project Laserbathymetry. 27 May 2014. Content. Aim of the project Questions to be answered Organization of the project Preliminary conclusions. Aim of the project. Not to lose track of important actual developments How much money do I need for surveying the relevant areas

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German Project Laserbathymetry

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  1. German Project Laserbathymetry 27 May 2014

  2. Content • Aim of the project • Questions to be answered • Organization of the project • Preliminary conclusions Ellmer: German Project

  3. Aim of the project • Not to lose track of important actual developments • How much money do I need for surveying the relevant areas • Many questions in detail: • Which areas are relevant for laserbathymetry? • Where is laserbathymetry cheaper than shipborne measurements? Ellmer: German Project

  4. Questions to be answered • Hydrographic Surveying in shallow areas • Role of environment (visibility, sea grass,…) • How deep is it possible? • Surveying in shallow lagoons (backwater) • … Ellmer: German Project

  5. Questions to be answered • Wreck Search • Objects of 2m size (IHO S-44)? Which size is certainly detectable • Is detectable size depth dependent? Ellmer: German Project

  6. Questions to be answered • Coastline • Possible to determine a DTM (1m until -1m)? And to detect 0-m-line? • What about data gaps in very shallow water? Ellmer: German Project

  7. Questions to be answered • Call for tenders • Possible flight parameters for all purposes (DTM, wreck search, coastline)? • What has to be considered when writing a call • How to calculate a price for budget planning? • § Ellmer: German Project

  8. Organization of the project • Overview • 3 years project 2012 - 2014 • Scientific Cooperation • Leibnitz Universität Hannover • 1 scientist • 3 flights autumn 2012, 2013, spring 2014 • Frequent meetings with different interested organizations • HO and university • Water and shipping administration (federal) • Coastal protection (states) • Navy (federal) • Land survey (states) Ellmer: German Project

  9. Organization of the project • 2012 • Request for high resolution • Milan with Riegl VQ820G • 3 heights (500m, 700m, 300m) Ellmer: German Project

  10. Organization of the project • 2013 • Request for high resolution plus deeper penetration • AHAB/TopScan with Chiroptera / HawkEye II • September 2013 • Addition of artificial reefs Ellmer: German Project

  11. Organization of the project • 2013 • Request for high resolution plus deeper penetration • AHAB/TopScan with Chiroptera / HawkEye II • September 2013 • Addition of artificial reefs Ellmer: German Project

  12. Organization of the project • 2014 • Request for high resolution plus deeper penetration • AHAB/Aerodata with Hawkeye III • Flight in April 2014 with Chiroptera • Additional flight with Hawkeye III in autumn Ellmer: German Project

  13. Organization of the project • 2013 + 2014 • Addition of artificial reefs Ellmer: German Project

  14. Organization of the project • Riff Nienhagen • Artificial reefs • Good for checking the accuracy • Located close to Rostock • Accurately surveyed by multibeam • reefs Ellmer: German Project

  15. Preliminary conclusions • 3 flights • Much information • Easier to collect data than to process all information • Evaluation 2013 is not finished • Processing 2014 just started • Conclusions at this time very rough Ellmer: German Project

  16. Preliminary conclusions • Very preliminary • Accuracy not the main problem • Dependent on careful processing • How to check the carefulness? Ellmer: German Project

  17. Preliminary conclusions • Data gaps • Data very inhomogeneous • From >5 points/m² to >5 m²/point • Gaps even in shallow areas • Still to develop: Which density is too low for S-44? Ellmer: German Project

  18. Preliminary conclusions • Wrecks, Obstructions • At this time not reliable to detect • Riff Rosenort data from Chiroptera 2013 Ellmer: German Project

  19. Preliminary conclusions • Résumé: • LIDAR is a very interesting development for shallow waters; • Traditional methods have disadvantages in shallow areas: • Single-beam data provide too large gaps in-between; • Multi-beam surveys need too many survey lines; • LIDAR does not provide an alternative but a complement; • Combination of land and sea data becomes more important • A wider scope of the use and users of the data is necessary: • Not only safety at Sea (nautical charting) • Not only coastal protection • This is in line with the Theme for World Hydrography Day 2014: • Hydrography – much more than nautical charting Ellmer: German Project

  20. Ellmer: German Project

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