Robin J. Beaman - Deepreef€¦ · Robin J. Beaman. School of Earth and Environmental Sciences,...

Robin J. Beaman

School of Earth and Environmental Sciences, James Cook University, Cairns, Qld 4870, Australia. Email: robin.beaman@jcu.edu.au

Seminar to the Australian Hydrographic Service, Wollongong, NSW, 8 July 2010

Seminar outline• What are the issues?• Data sources.• Data challenges.• Data statistics.• Gridding process.• Present the gbr100 V1.0 model.• Future research & opportunities.

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What are the issues? High-res depth model required within a whole-of-

GBR scale hydrodynamic model. Lack of info about deep-water ecosystems lying

deeper than 200 m in GBRWHA. Vast areas of reefs and shoals have never been

mapped with modern survey techniques. Key seabed features are hidden from view and

outside of effective management.

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Resolution: 0.001-arc deg (~100m)

Longitude: 142° to 160° East

Latitude: 10° to 29° South

Horizontal datum: WGS84

Vertical datum: MSL

Area: 3,000,000 km2

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Multibeam swath surveys

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Example source multibeam data:RV Southern Surveyor, GBR margin, 2007

5 km

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Singlebeam echosounder surveys

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10 km

Example singlebeam data:GBR Seabed Biodiversity survey, 2003-2005

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Lidar aerial surveys

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Example lidar data:RAN LADS survey, Ribbon Reefs, 1995

3 km

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Satellite bathymetry

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Example satellite bathymetry data:ALOS AVNIR2 scene, offshore Cooktown

Equivalent lidar coverage

4 km

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Satellite elevation

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Example satellite elevation data:SRTM 1-arcsec data, Hinchinbrook Island

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Horizontal datum

WGS84

AGD66

WGS84

WGS84

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Vertical datum

MSL

LAT

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Coastline

0 m

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Noise

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~840million xyz points

(not including SRTM)

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Proportion of data sources

94.31%

2.42%

2.77%0.27%

0.24%

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Gridding process

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Stradbroke, Moreton Islands

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Fraser Island

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Capricorn, Bunker Group

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Shoalwater Bay, Pompey Reef

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Whitsunday Islands

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Townsville area

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Cairns area

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Cooktown area

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Cape York area

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Southern Queensland Plateau

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Northern Queensland Plateau

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Southern seamounts

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Northern plateaus

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30 km

AusBathyTopo (GA, 2009)

New gbr100 grid

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60 km

New gbr100 grid

AusBathyTopo (GA, 2009)

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Future research & opportunities• Public accessible formats by 30 Sept 2010.• Ongoing revision of gbr100 grid (V2.0+).• Fine-scale geomorphic maps by June 2011.

• Expanded spatial coverage at 100 m-resolution?• Satellite bathymetry for remote reef areas?• New uses for 3D grids and collaborations?

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Acknowledgments• David Sandwell (SIO)• Michael Andrew, Mark Bolger (AHS)• Andrew Owen, Robert Parums, Steve Sagar (GA)• Rudi Kloser, Roland Pitcher (CSIRO)• MSQ and Qld Ports Authorities• Sheriden Morris (RRRC)• Qld Smart Futures Fellowship

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