Robin J. Beaman School of Earth and Environmental Sciences, James Cook University, Cairns, Qld 4870, Australia. Email:
[email protected] 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. 2 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. 3 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 4 Multibeam swath surveys 5 Example source multibeam data: RV Southern Surveyor, GBR margin, 2007 5 km 6 Singlebeam echosounder surveys 7 Example singlebeam data: GBR Seabed Biodiversity survey, 2003-2005 10 km 8 Lidar aerial surveys 9 Example lidar data: RAN LADS survey, Ribbon Reefs, 1995 3 km 10 Satellite bathymetry 11 Example satellite bathymetry data: ALOS AVNIR2 scene, offshore Cooktown Equivalent lidar coverage 4 km 12 Satellite elevation 13 Example satellite elevation data: SRTM 1-arcsec data, Hinchinbrook Island 14 Horizontal datum WGS84 AGD66 WGS84 WGS84 15 Vertical datum MSL LAT 16 Coastline 0 m 17 Noise 18 ~840million xyz points (not including