Lidar bathymetry - technology and applications

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Lidar Bathymetry – Technology and applications
Oct 24rd, Netanya, Israel
Anders Ekelund
Managing Director
Airborne Hydrography AB
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
Products
3
• 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
LIDAR Bathymetry - What’s the Attraction?
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
The advantages of LIDAR bathymetry
- Delivers data from both land and 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 HawkEye data and tidal model
– Shoreline definition
– Image orthomosaics
– Sea-bed reflectance product
– Additional environmental products
Visingsö - Multibeam
Visingsö – Topographic HawkEye II data
Visingsö – Bathymetric HawkEye II data
Visingsö – Bathymetric HawkEye 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 30m 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
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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
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–
–
–
–
–
–
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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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