Australian bathymetry and Topography, June 2005

Geoscience Australia and the National Oceans Office carried out a joint venture project to produce a consistent, high-quality 9 arc second (0.0025 degree or ~250 m at the equator) bathymetric data grid of those parts of the Australian water column jurisdiction lying between 92E and 172E and 8S and 60S. As well as the waters adjacent to the continent of Australia and Tasmania, the area selected also covers the area of water column jurisdiction surrounding Macquarie Island, and the Australian Territories of Norfolk Island, Christmas Island, and Cocos (Keeling) Islands. The area selected does not include Australias marine jurisdiction off of the Territory of Heard and McDonald Islands and the Australian Antarctic Territory. The underlying data from which this grid is derived can only support this resolution in areas where direct bathymetric observations are sufficiently dense (e.g. where swath bathymetry data or digitised chart data exist). In areas where only track-line data exist, the grid resolution is high along-line but low perpendicular to lines. In areas where no sounding data are available, the grid is based on interpolated or indirectly observed bathymetry, and these data can only support a resolution of 2 arc minutes (2 nautical miles or ~3.7 km). The grid covers an area of approximately 41 million square kilometres. Its dimensions are 32003 x 20803 cells resulting in a file size slightly in excess of 1.3 Gb of 2-bytes integer numbers representing the bathymetric values. The grid synthesises approximately 1.7 billion observed data points. This grid is not suitable for use as an aid to navigation, or to replace any products produced by the Australian Hydrographic Service. This dataset is a contribution to the CERF Marine Biodiversity Hub and is hosted temporarily by CMAR on behalf of Geoscience Australia.澳大利亚地质调查局（Geoscience Australia）与国家海洋办公室（National Oceans Office）联合实施项目，制作了一套一致性优异、品质精良的9弧秒（0.0025°，赤道处分辨率约250米）水深测量网格数据，覆盖澳大利亚水柱管辖区域内东经92°至172°、南纬8°至60°的范围。 除澳大利亚大陆及塔斯马尼亚岛周边海域外，所选区域还涵盖麦夸里岛周边的水柱管辖海域，以及诺福克岛、圣诞岛与科科斯（基林）群岛的澳大利亚领地海域。 所选区域未包含赫德岛和麦克唐纳群岛领地及澳大利亚南极领地的海洋管辖海域。 本网格的原始数据源仅在直接水深观测足够密集的区域（如具备条带测深数据或数字化海图数据的区域）才能支撑该分辨率。 仅存在测线数据的区域，网格沿测线方向分辨率较高，而垂直测线方向分辨率偏低。 无测深数据的区域，网格数据基于插值或间接观测的水深结果，此类数据仅能支持2弧分（2海里，约3.7公里）的分辨率。 该网格覆盖面积约4100万平方公里，网格单元总数为32003×20803，存储水深数值的2字节整数型数据文件大小略超1.3吉字节。 本网格整合了约17亿个实测数据点。 本网格不适用于航海辅助用途，亦不可替代澳大利亚海道测量局（Australian Hydrographic Service）生产的各类相关产品。 本数据集是CERF海洋生物多样性枢纽（CERF Marine Biodiversity Hub）的共建成果，暂由CMAR代澳大利亚地质调查局托管。