Australian Bathymetry and Topography Grid, June 2009

This record was superseded on 30/08/2023 with approval from the Director, National Seabed Mapping as it has been superseded by eCat 148758.

In 2005 Geoscience Australia and the National Oceans Office undertook a joint project to produce a consistent, high-quality 9 arc second (0.0025° or ~250m at the equator) bathymetric grid for Australian waters. In 2009 a number of new datasets were included in an updated version of the grid.

The 2009 bathymetric grid of Australia has been produced to include recently acquired datasets, and solutions to issues identified in the previous version. The revised grid has the same extents as its 2005 counterpart, including the Australian water column jurisdiction lying between 92° E and 172° E, and 8° S and 60° S. The waters adjacent to the continent of Australia and Tasmania are included, as are areas surrounding Macquarie Island, and the Australian Territories of Norfolk Island, Christmas Island, and Cocos (Keeling) Islands. The area selected does not include Australia's marine jurisdiction offshore from the Territory of Heard and McDonald Islands and the Australian Antarctic Territory.

This report details the datasets and procedures used to produce the 2009 bathymetric grid of Australia. As per the 2005 grid, the 0.0025 decimal degree (dd) resolution is only supported where direct bathymetric observations are sufficiently dense (e.g. where swath bathymetry data or digitised chart data exist) (Webster and Petkovic, 2005). In areas where no sounding data are available (in waters off the Australian shelf), the grid is based on the 2 arc minute ETOPO (Smith and Sandwell, 1997) and 1 arc minute ETOPO (Amante and Eakins, 2008) satellite derived bathymetry. The topographic data (on shore data) is based on the revised Australian 0.0025dd topography grid (Geoscience Australia, 2008), the 0.0025dd NZ topography grid (Geographx, 2008) and the 90m SRTM DEM (Jarvis et al, 2008).

The final dataset has been provided in ESRI grid and ER Mapper (ers) formats. An associated shapefile has been produced so that the user can identify the input datasets that were used in the final grid.

IMPORTANT INFORMATION

This grid is not suitable for use as an aid to navigation, or to replace any products produced by the Australian Hydrographic Service. Geoscience Australia produces the 0.0025dd bathymetric grid of Australia specifically to provide regional and local broad scale context for scientific and industry projects, and public education.

The 0.0025dd grid size is, in many regions of this grid, far in excess of the optimal grid size for some of the input data used. On parts of the continental shelf it may be possible to produce grids at higher resolution, especially where LADS or multibeam surveys exist. However these surveys typically only cover small areas and hence do not warrant the production a regional scale grid at less than 0.0025dd.

There are a number of bathymetric datasets that have not been included in this grid for various reasons. Comments or queries about the data included in the grid (or excluded) can be directed to: [e-mail].

This grid is not suitable for use as an aid to navigation, or to replace any products produced by the Australian Hydrographic Service.

本记录于2023年8月30日经国家海底测绘局局长批准后失效，原记录已由eCat 148758替代。

2005年，澳大利亚地质调查局（Geoscience Australia）与国家海洋办公室（National Oceans Office）联合开展项目，旨在为澳大利亚海域构建一套统一、高质量的9弧秒（0.0025°，赤道处约250米）水深栅格（bathymetric grid）数据集。2009年，该栅格的更新版本纳入了一批新数据集。

本次发布的2009版澳大利亚水深栅格，纳入了最新获取的数据集，并针对前一版本中发现的问题进行了优化修正。修正后的栅格与2005版具有相同的覆盖范围，涵盖东经92°至172°、南纬8°至60°之间的澳大利亚海域管辖水域。其中包括澳大利亚本土与塔斯马尼亚岛周边海域、麦夸里岛周边海域，以及诺福克岛、圣诞岛和科科斯（基林）群岛等澳大利亚海外领地海域。本次数据集的覆盖范围不包含赫德和麦克唐纳群岛领地以及澳大利亚南极领地的近海海洋管辖区域。

本报告详细说明了用于构建2009版澳大利亚水深栅格的数据集与技术流程。与2005版栅格一致，0.0025十进制度（dd）的空间分辨率仅适用于直接水深观测数据足够密集的区域（例如存在条带测深数据或数字化海图数据的区域）（Webster与Petkovic，2005）。在无测深数据的澳大利亚陆架外海域，本栅格基于2弧分ETOPO（Smith与Sandwell，1997）和1弧分ETOPO（Amante与Eakins，2008）卫星衍生水深数据构建。陆上地形数据则基于修正后的澳大利亚0.0025dd地形栅格（Geoscience Australia，2008）、0.0025dd新西兰地形栅格（Geographx，2008）以及90米SRTM数字高程模型（SRTM DEM，Jarvis等，2008）。

最终数据集以ESRI栅格与ER Mapper（ers）格式提供。同时配套生成了关联的形状文件（shapefile），以便用户识别最终栅格所使用的输入数据集。

重要提示
本栅格不适用于航海导航辅助，亦不可替代澳大利亚水文服务局（Australian Hydrographic Service）所生产的任何产品。澳大利亚地质调查局（Geoscience Australia）开发0.0025dd澳大利亚水深栅格，旨在为科学研究与产业项目提供区域及局域的大尺度背景数据，并用于公共科普教育。

在本栅格的诸多区域中，0.0025dd的栅格尺寸远大于部分输入数据的最优栅格尺寸。在部分大陆架区域，可生成更高分辨率的栅格，尤其是存在激光航空测深系统（LADS）或多波束测量数据的区域。但此类测量通常仅覆盖小范围区域，因此无需生成分辨率高于0.0025dd的区域尺度栅格。

由于各类原因，部分水深数据集未被纳入本栅格。若对本栅格纳入或未纳入的数据集存在意见或疑问，请发送邮件至：[e-mail]。

本栅格不适用于航海导航辅助，亦不可替代澳大利亚水文服务局所生产的任何产品。