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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 - PowerPoint PPT Presentation
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German Project Laserbathymetry27 May 2014
21.04.23 Ellmer: German Project 2
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?
21.04.23 Ellmer: German Project 3
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)
•…
21.04.23 Ellmer: German Project 4
Questions to be answered
Wreck Search
•Objects of 2m size (IHO S-44)? Which size is certainly detectable
•Is detectable size depth dependent?
21.04.23 Ellmer: German Project 5
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?
21.04.23 Ellmer: German Project 6
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?
21.04.23 Ellmer: German Project 7
§
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)21.04.23 Ellmer: German Project 8
21.04.23 9Ellmer: German Project
Organization of the project
2012
•Request for high resolution
•Milan with Riegl VQ820G
•3 heights (500m, 700m, 300m)
10Ellmer: German Project21.04.23
Organization of the project
2013
•Request for high resolution plus deeper penetration
•AHAB/TopScan with Chiroptera / HawkEye II
•September 2013
•Addition of artificial reefs
1121.04.23 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 Project21.04.23
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 Project21.04.23
Organization of the project
2013 + 2014
•Addition of artificial reefs
Organization of the project
Artificial reefs
•Good for checking the accuracy
•Located close to Rostock
•Accurately surveyed by multibeam
21.04.23 Ellmer: German Project 14
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
21.04.23 Ellmer: German Project 15
Preliminary conclusions
Very preliminary
•Accuracy not the main problem
•Dependent on careful processing
• How to check the carefulness?
21.04.23 Ellmer: German Project 16
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?
21.04.23 Ellmer: German Project 17
Preliminary conclusions
Wrecks, Obstructions
•At this time not reliable to detect
•Riff Rosenort data from Chiroptera 2013
21.04.23 Ellmer: German Project 18
Preliminary conclusions
21.04.23 Ellmer: German Project 19
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
21.04.23 Ellmer: German Project 20