German Project Laserbathymetry 27 May 2014

Ellmer: German Project2 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 Many questions in detail: Which areas are relevant for laserbathymetry? Where is laserbathymetry cheaper than shipborne measurements? Ellmer: German Project3

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 Project4

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 Project5

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 Project6

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 Project7 §

Organization of the project Overview 3 years project 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 Project8

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

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

12Ellmer: German Project 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

13Ellmer: German Project Organization of the project Addition of artificial reefs

Organization of the project Artificial reefs Good for checking the accuracy Located close to Rostock Accurately surveyed by multibeam Ellmer: German Project14 reefs Riff Nienhagen

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 Project15

Preliminary conclusions Very preliminary Accuracy not the main problem Dependent on careful processing How to check the carefulness? Ellmer: German Project16

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 Project17

Preliminary conclusions Wrecks, Obstructions At this time not reliable to detect Riff Rosenort data from Chiroptera Ellmer: German Project18

Preliminary conclusions Ellmer: German Project19 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

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