BSHC LIDAR SeminarHannover 27-28 May 2014Finnish Transport Agency

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Table of contents

1. Why FTA interested in Bathymetric LIDAR?

2. Co-operation (national/international)

3. Previous operations in Finnsh waters

4. Special features of Finnish waters

5. Issues to be studied

6. FTA future plans

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1. Why FTA interested in Bathymetric LIDAR?

● Possible alternative to survey shallow coastal waters and lakes (depths 0 to approximately max 10 m)

● Areas difficult or dangerous to survey using vessels

● Method to produce preliminary data for surveys done by vessels

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2. Co-operation (national/international)

● To share experiences and knowledge (techical, commercial)

● International co-operation in LIDAR survey-operations (survey areas in different countries within the same survey campaign)

● National co-operation between organizations (e.g. flood analysis and protection, environmental agencies)

● At the same time possible to conduct topographic surveys

● Coast line determination using LIDAR data (bathy/topo)

● Wider finaincing possibilities if more stakeholders (e.g. EU-funding)

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3. Previous operations in Finnish watersBathymetry

● 1999 (November) Åland sea (Finnish Maritime Administration)

• Survey area around 160 km2 , point density 5 x 5 m

• Secchi-depth around 3 – 7 m (dependent on weather and environmental circumstances!!)

• Resulted depths 3 – 15 m

• No full bottom coverage in depths 3 – 5 m

• Partly unsurveyed or no-data -> need for supplementary surveys with acoustic survey systems

Other purposes

● 2009 (continuing 20XX?) Bay of Bothnia (U.L.T.R.A. Utveckling av Lidar-baserad Terränganalys för Regional Användning, ” The development of utilization of Lidar based regional topography analysis”)

● 2010-11 Gulf of Finland (Kaunissaari, Pyhtää), ”GIFLOOD”: University of Turku and National Land Survey + other organizations

• lidar was only one small part project shallow waters

http://www.syke.fi/en-US/Research__Development/Research_and_development_projects/Projects/Developing_mapping_and_modeling_approaches_as_a_part_of_flood_risk_management_business_GIFLOOD

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4. Special features of Finnish waters

● Poor visibility (low Secchi depth)

● Very shallow coastal waters far out to the open sea

● Varying bottom topography

● Huge amount of boulders! (feature detection issue!)

● Varying coast line, tens of thousands of islands -> what is really the net productivity of survey (cost / benefit ratio might not be so good?!)

● Examples: Sipoonselkä, Extract chart 953, Chart 953, Chart 42 (Reposaari), Extract chart 42 (Reposaari), Lake Oulujärvi

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5. Issues to be studied

● Depth penetration capability vs. point density (high power vs. low power)?

● Point density vs. depth pentration capability (low power vs. high power)?

● Feature detection capability? (Will the shallowest point of a feature be recorded?)

● Footprint size

● Positioning accuracy

● Can full-bottom search be achieved?

● Bathy and topo lidar at the same flight

● Other sensors with the same flight

• Camera

• Multispectral sensors

● Is there existing ”thumb rules”: when LIDAR is feasible / might be feasible / not at all feasible

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6. FTA future plans

● Pilot project?

● Operative production?

● Co-operation (national/international)

● Funding

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Thank You!