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Lidar Bathymetry – Technology and applicationsOct 24rd, Netanya, Israel
Anders Ekelund
Managing Director
Airborne Hydrography AB
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Airborne Hydrography AB
World recognized supplier of Airborne LIDAR systems
Products• HawkEye II for bathymetry• Chiroptera for shallow water• DragonEye for land
Privately owned
Airborne Hydrograpy was formed in a buyout from SAAB AB, and has accumulated more than 25 years of bathymetric LiDAR product development for SAAB and the Swedish Navy
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Products3
• HawkEye 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
• DragonEye– A high end pure topographic LIDAR system
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LIDAR Bathymetry - What’s the Attraction?
The advantages of LIDAR bathymetryThe advantages of LIDAR bathymetry - Delivers data from both land and sea/floor- Delivers data from both land and sea/floor - Fast progress (typical 10-50 Square km / - Fast progress (typical 10-50 Square km /
hour)hour) - No hazard for survey ships- No hazard for survey ships - Delivers the accuracy the authorities need- Delivers the accuracy the authorities need
LiDAR Bathymetry is very cost efficient tool for large scale digital elevation modelling projects in the coastal zone
Area coverage 10-50 km2 per hour
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System design
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Batmetric LIDAR
• Typical end products– X,Y, Z point clouds (bathymetric and
topographic)– Digital Elevation Models – Bathymetric charts, X,Y depths created
from HawkEye data and tidal model– Shoreline definition– Image orthomosaics– Sea-bed reflectance product– Additional environmental products
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Visingsö - Multibeam
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Visingsö – Topographic HawkEye II data
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Visingsö – Bathymetric HawkEye II data
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Visingsö – Bathymetric HawkEye II data
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Visingsö - Shoreline
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Visingsö – Contour lines
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Sea bed reflectance
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Sample data – Combined bathy – topo / Motala river mouth
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Sample data Topo example – Industrial area
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Sample data – RGB colored point cloud
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Sample data – RGB colored point cloud
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Sample data – River Topo / Bathy crossection
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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 30m 2001.
• Anchored on about 2,5 meters depth, at about 5,5 meters water depth.
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Sea-mine detection
• The sea-mine is clearly visible in between the sea-surface and sea-bed
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Natural target at sea-floor
• Blue - Multibeam data• Green - LIDAR data• 0.8 meter high bolder found in both multibeam and LIDAR
dataset
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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
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Sample data – Boats in the harbour
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Sample data- 2 meters dreging for new small boat harbour
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Sample data28 meter high object on the surface, 4,4 meters depth belowWhat’s that?
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A Fountain!
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SummaryModern 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)
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SummaryModern 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
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SummaryModern 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