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Bathymetry Map

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  • A bathymetric grid of the South Tasman Rise Region (Longitudes 138° E - 158° E, Latitudes 38° S - 54° S) is produced. In doing so, the individual datasets used have been closely examined and any deficiencies noted for further follow up or have been rectified immediately and the changes documented. These datasets include modern multibeam data, coastline data obtained from georeferenced SPOT imagery, hydrographic quality data, echosounder data from research vessels and satellite derived bathymetric data. A hierarchical system was employed whereby the best and most extensive datasets were gridded first and applied as a mask to the next best dataset. A new masking grid would be formed from these datasets to pass non-overlapping data in the next best dataset. This procedure was employed until finally the satellite data were masked. All the various levels of masked data were then brought together by the gridding algorithm (Intrepid - Desmond Fitzgerald Associates) and an ERMapper format grid produced. A grid cell size of 0.00225° (nominal 250m) was used with many iterations of minimum curvature gridding and several passes of smoothing. The final grid is available in ERMapper, ArcInfo and ASCII xyz formats

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  • This has been superceded by GeoCat 71670

  • The Global Digital Elevation Model (ETOPO2v2) represents gridded (2 minute by 2 minute) elevation and bathymetry for the world. Two versions of the grid exist, a cell centred version and a grid centred version. As the cell centred version (ETOPO2v2c) is considered to be the authoritative source, this version was used at GA to make the extract. As a result, the depth/elevation values are centred on intersections of lines of odd minutes of latitude and longitude. An extract of this dataset was made for use in the Australian Region. The extract extends from 5°S to 80°S and from 45°E to 180°E.