German Project Laserbathymetry

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?


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)

•…



Wreck Search

•Objects of 2m size (IHO S-44)? Which size is certainly detectable

•Is detectable size depth dependent?



Coastline

•Possible to determine a DTM (1m until -1m)? And to detect 0-m-line?

•What about data gaps in very shallow water?



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?


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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


2012

•Request for high resolution

•Milan with Riegl VQ820G

•3 heights (500m, 700m, 300m)

10Ellmer: German Project21.04.23


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


2013


•AHAB/TopScan with Chiroptera / HawkEye II

•September 2013




2014


•AHAB/Aerodata with Hawkeye III

•Flight in April 2014 with Chiroptera

•Additional flight with Hawkeye III in autumn



2013 + 2014



Artificial reefs

•Good for checking the accuracy

•Located close to Rostock

•Accurately surveyed by multibeam


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



Very preliminary

•Accuracy not the main problem

•Dependent on careful processing

• How to check the carefulness?



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?



Wrecks, Obstructions

•At this time not reliable to detect

•Riff Rosenort data from Chiroptera 2013




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

German Project Laserbathymetry

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