Discussion and Conclusions
[26] A new bathymetric grid was created for the region
140.0–150.0E, 6.0–14.0S with a cell size of 3.600.
Compared to GEBCO and ETOPO2, the region benefited
from the addition of numerous new data sets including
multibeam sonar surveys, hydrographic data sets, and
bathymetry derived from Landsat. This significant increase
in data availability added much needed detail to the Gulf of
Papua and assisted with identifying past and present sedimentary
environments both on the continental shelf and
slope [Tcherepanov et al., 2008; Crockett et al., 2008;
Francis et al., 2008].
[27] RRMSE analysis of overlapping data sets has suggested
that errors between traditionally acquired bathymetric
data sets were on the order of <10%. When traditionally
acquired data sets were compared to bathymetry derived
from Landsat the error increased to 17.9–35.53%. The
significantly higher errors associated with Landsat-derived
bathymetry were considered to be a result of variable water
quality and seabed types within individual Landsat scenes.
The Landsat bathymetry was retained within the grid,
despite it relatively low accuracy, as it assisted with delineating
seabed features and covered areas that were data
poor.
[28] The data density maps (Figures 2a–2f) highlight
many areas where very little bathymetric data presently
exist. The continental shelf around Papua New Guinea and
Indonesia and the deep portion of the southern Coral Sea
remain data poor.
[29] Acknowledgments. The construction of this bathymetry grid
would not have been possible without data provided by the MARGINS
Source-to-Sink research group (specifically Chuck Nittrouer, Andre Droxler,
and Brian Donahue), Geoscience Australia, Royal Australian Navy
(RAN) Australian Hydrographic Service (AHS), Scripps Institution of
Oceanography (SIO), Lamont-Doherty Earth Observatory (LDEO), Australian
Institute of Marine Science (AIMS), Commonwealth Scientific and
Industrial Research Organisation (CSIRO), French Research Institute for
Exploitation of the Sea (IFREMER), French Polar Institute (IPEV), Great
Barrier Reef Marine Park Authority (GBRMPA), Japanese Marine Science
and Technology Centre (JAMSTEC), and National Aeronautics and Space
Administration (NASA). Landsat imagery was provided by the Australian
Centre for Remote Sensing (ACRES). The MARGINS Source-to-Sink
research group was supported by National Science Foundation. I also wish
to thank Peter Petkovic, Craig Smith, Michael Hughes, and Peter Harris for
reviewing this pape
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