In relation to our series upon the coral reef mapping in Australia we can report one further achievement. A new 3D map shows the underwater topography of the Flinders Reefs that lie around 230km offshore from Townsville in the North of Queensland, Australia. The initiative is triggered by Dr. Robin Beaman from James Cook University in Cairns. While large parts of Australian’s reefs were mapped by the Royal Australian Navy using their LADS airborne lidar bathymetry system, Dr. Beaman works together with the Germany based company EOMAP and takes advantage of optical satellite imagery from LANDSAT 8 to map considerable areas of shallow reefs that lack detailed maps.  The high-resolution data allow to extract bathymetric information down to a depth of around 50m owing to the clear, sunlit water at these reefs.

“By refining the satellite data and merging it with existing data, I’ve produced 3D depth maps for these reefs and atolls. That gives us a much more detailed picture than was previously available” Dr. Beaman said.

The project focussed on the reefs and atolls within those waters of the Coral Sea that fall within Australia’s Exclusive Economic Zone, also called the Coral Sea marine Reserve.

“These are atolls that grew upwards from tilted continental blocks created when Gondwana was breaking up. The 3D images we now have of North and South Flinders Reefs are really stunning, showing classic atoll shapes with a shallow coral rim around a deeper lagoon. With this new 3D information we can now better predict where coral diversity is located around the edge of these reefs, because we know where we’re likely to find the shallow and deeper coral communities,” he said. – “That information will help marine researchers to plan future scientific expeditions, and it will help managers of the various conservation zones determine what other marine life they can expect to find there.”

Dr Beaman hopes the maps will be a valuable resource in the ongoing discussion as to what levels of protection should be given to different areas of the Coral Sea Marine Reserve.

More broadly, oceanographers could use the 3D data to more accurately model how oceanic currents move over and past these reefs before reaching the Great Barrier Reef.

EOMAP, which did the realization of mapping, resides in Munich. Its site can be found here.

North-westerly view of the Coral Sea reefs towards Cairns. Depths are coloured red (shallow) to purple (deep), over a depth range of about 4000 metres. Exposed land is coloured grey. Source: Includes material © (2015) EOMAP. All rights reserved.

North-westerly view of the Flinders Reefs in the Coral Sea, about 230 km offshore from Townsville.
Depths are coloured red (shallow) to purple (deep), over a depth range of about 50 metres. Source: Bathymetry data © (2015) EOMAP Bathymetry

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