Lidar Bathymetry – Technology and applications Oct 24 rd, Netanya, Israel Anders Ekelund Managing Director Airborne Hydrography AB
Airborne Hydrography AB World recognized supplier of Airborne LIDAR systems Products • Hawk. Eye II for bathymetry • Chiroptera for shallow water • Dragon. Eye for land Privately owned Airborne Hydrograpy was formed in a buyout from SAAB AB, and has accumulated more than 25 years of bathymetric Li. DAR product development for SAAB and the Swedish Navy
Products 3 • Hawk. Eye II – An airborne coastal survey system including deep water bathymetry and topographic LIDAR • Chiroptera – A shallow water coastal survey system including high density bathymetric LIDAR and high end topographic LIDAR • Dragon. Eye – A high end pure topographic LIDAR system
LIDAR Bathymetry - What’s the Attraction? Li. DAR Bathymetry is very cost efficient tool for large scale digital elevation modelling projects in the coastal zone Area coverage 10 -50 km 2 per hour The advantages of LIDAR bathymetry - Delivers data from both land sea/floor - Fast progress (typical 10 -50 Square km / hour) - No hazard for survey ships - Delivers the accuracy the authorities need
System design
Batmetric LIDAR • Typical end products – X, Y, Z point clouds (bathymetric and topographic) – Digital Elevation Models – Bathymetric charts, X, Y depths created from Hawk. Eye data and tidal model – Shoreline definition – Image orthomosaics – Sea-bed reflectance product – Additional environmental products
Visingsö - Multibeam
Visingsö – Topographic Hawk. Eye II data
Visingsö – Bathymetric Hawk. Eye II data
Visingsö – Bathymetric Hawk. Eye II data
Visingsö - Shoreline
Visingsö – Contour lines
Sea bed reflectance
Sample data – Combined bathy – topo / Motala river mouth
Sample data Topo example – Industrial area
Sample data – RGB colored point cloud
Sample data – RGB colored point cloud
Sample data – River Topo / Bathy crossection
Sea-mine detection • Dummy sea-mine – 70 cm diameter water filled boat fender, – painted in NATO green according to Ministry of Defence standard 00 -23, Issue 3, may 30 m 2001. • Anchored on about 2, 5 meters depth, at about 5, 5 meters water depth.
Sea-mine detection • The sea-mine is clearly visible in between the sea-surface and seabed
Natural target at sea-floor • Blue - Multibeam data • Green - LIDAR data • 0. 8 meter high bolder found in both multibeam and LIDAR dataset
Man made target • Blue - Multibeam data, • Green - LIDAR data • A one meter high cube placed on the sea-floor after the multibeam survey, discovered by the LIDAR
Sample data – Boats in the harbour
Sample data - 2 meters dreging for new small boat harbour
Sample data 28 meter high object on the surface, 4, 4 meters depth below What’s that?
A Fountain!
Summary Modern bathymetric LIDAR • Simultanious capture of topo and bathy – Full waveform in both topo and bathy • Reasonable depth penetration – > 20 meter in clear waters k=0, 1 – > 10 meters in less clear water k=0, 2 • Capture of small targets – IHO special order objects detected to about 2/3 of the depth penetration • Excellent accuray – Bathymetry close to IHO special order (25 cm, 2 sigma, absolute)
Summary Modern bathymetric LIDAR • High data density – Typical • Topo > 10 points per square meter • Bathy > 1 point per square meter • Easy installation – Sensor weight: 80 Kg – Power consumption: 15 Amp on the 28 VDC supply – One single turn key unit – Simple touch sceen operators interface
Summary Modern bathymetric LIDAR • Can be used for a large number of appliacations – – – – – Coastal monitoring Sea-Charting Environmental monitoring Oil and Gas Pipelines Ports, harbours River survey Object (sea-mine detection) Sea-bed classification Military applications
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