IMAS Metadata Catalogue
EARTH SCIENCE | OCEANS | BATHYMETRY/SEAFLOOR TOPOGRAPHY | SEAFLOOR TOPOGRAPHY
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Seabed areas were derived by aggregating and dissolving the boundaries of the 1 degree S57 file series for the Australian continental shelf and Lord Howe Island shelf (200 m). These areas were defined by the Australian Hydrographic Service (AHS).
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Reef features were derived by aggregating and dissolving the boundaries of the 1 degree S57 file series for the Australian continental shelf (200 m). These are reefs defined by the Australian Hydrographic Service (AHS) that could potentially be a navigational hazard .
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These contours are derived from the Australian Bathymetry and Topography Grid, June 2009 (Geoscience Australia).
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Raised features were derived by aggregating and dissolving the boundaries of the 1 degree S57 file series for the Australian continental shelf and Lord Howe Island shelf (200 m) depicting depth area features. An algorithm was applied to the data that isolated these features from surrounding lower features or plains.
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An index of available 1 degree, 10 degree and 30 degree navigational S57 files that the Australian Hydrographic Service (AHS) holds. These were aggregated together to provide an overview for the NESP D3 Reef Project on potential sources of information.
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Depth areas were derived by aggregating and dissolving the boundaries of the 1 degree S57 file series for the Australian continental shelf and Lord Howe Island shelf (200 m) depicting depth area polygons.
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This GIS layer is the product of interpreted multibeam acoustic data charaterising the distribution pattern of seafloor habitats at forty sampling sites within the Flinders Commonwealth Marine Reserve. The three classes that were mapped include hard, mixed and soft substrate. Mappin the Flinders CMR is a prerequisite to understanding the relationships between inshore (shelf) and offshore (slope) habitats and therefore representing a key element in developing effective management for the depth strata across the entire CMR. Habitat characterisation provides the underlying spatial framework for developing models of habitat dynamics, trophic interactions and spatial distribution of marine biodiversity.
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The intertidal area was derived by aggregating and dissolving the boundaries of the 1 degree S57 file series for the Australian continental shelf and Lord Howe Island shelf (200 m) depicting depth area features.
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This dataset comprises derived bathymetric isobaths (depth contour lines) generated from the Geoscience Australia (GA) AusBathyTopo 250m 2024 gridded bathymetric dataset (https://dx.doi.org/10.26186/150050). The AusBathyTopo 250m grid provides a high-resolution terrain model for Australia, covering ocean and land areas from 92°E to 172°E and 8°S to 60°S at a resolution of 250 metres. The bathymetric contours are clipped to the boundaries of the Australian Exclusive Economic Zone (EEZ: https://amsis-geoscience-au.hub.arcgis.com/datasets/geoscience-au::exclusive-economic-zone-limits/about), and includes all regions including and below Mean Sea Level (MSL). Four contour datasets are provided: 1) 100 m intervals: full EEZ coverage. 2) 5 m intervals: shallow regions between 0–200 m depth (nominally the Australian continental shelf and shallow oceanic features). 3) 1 m intervals: shallow regions between 0–200 m depth. 4) Composite product: Multi-resolution contours with full EEZ coverage, including: • 2 m intervals for depths 0–30 m. • 5 m intervals for depths 30–100 m. • 10 m intervals for depths 100–200 m. • 50 m intervals for depths 200–2,000 m. • 100 m intervals for depths 2,000–8,000 m. These contour datasets are intended for use in marine spatial planning, mapping visualisation, and broad-scale analysis. Due to the smoothing procedures applied during their creation the are not suitable for engineering or high-precision applications. The contours presented through the Web Mapping Services (WMS) linked to this record are optimised for visualisation purposes and have been simplified using a tolerance of 10 meters for efficient rendering in mapping applications. For users requiring full-resolution data, the download packages include the original, unsimplified contour products.
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The Tasman Fracture Commonwealth Reserve complements the Port Davey Marine Reserve (encompassing Port Davey, Bathurst Channel and Bathurst Harbour), which was proclaimed by the Tasmanian Government in 2005. It spans the continental shelf, continental slope and deeper water ecosystems south of Tasmania, and is scored by steep canyons. It also encloses other geological features, including steep escarpments and troughs, saddles, basins, and part of a plateau that is over 400 km long and rises up to 3 km above the sea floor. The reserve includes a number of undersea peaks rising to less than 1500 m below the sea surface that provide habitat to deepwater hard corals. These corals provide a structure and habitat for a rich diversity of marine invertebrate animals that live attached corals. This record describes a geomorphology map for the Tasman Fracture CMR that was prepared using bathymetry and backscatter data sourced from CSIRO and Geoscience Australia.