No abstract available

No abstract available

This product is no longer available.

Complete set of 24 sheets This product is no longer available.

This product is no longer available.

No abstract available

The Geophysical Processing and Data Access (GPDA) project at Geoscience Australia has undertaken a programme of collating, editing and cataloguing all bathymetry data in the Australian Region. For convenience this region has been loosely defined as extending from 5CS to 80CS and 45CE to 180CE. The contents of the Bathymetric Database consists of four datatypes: - Multibeam Echosounder Data (including LADS) - Singlebeam Echosounder Data - Depths from the digitisation of pre-existing maps - "Depths" derived from remote sensing techniques (and produced grids) The dataset described by this metadata record is the Digitised Bathymetric Maps Dataset. The history of this dataset is somewhat convoluted as the digitising has been conducted by a number of organisations over a number of years using a variety of approaches. Essentially the dataset consists of any bathymetric data that were acquired by GA as the result of digitising a paper based map (or its electronic image). The types of maps that have been digitised include - AHS Fairsheets - AHS/Admiralty and IHO Charts (supplied by AHS) - NATMAP Bathymetric Series Maps (supplied by AHS) - State government Department of Works Maps - Miscellaneous maps produced by other organisations The data digitised by the AHS are supplied to GA in AHS Hydrographic Transfer Format (.htf). This ASCII based format has excellent metadata header records and a uniform organisation of the depth data, making them ideal for incorporation into a relational database. In addition the AHS have supplied Geotif images of the original maps (Fairsheets and Charts) that were used to produce the .htf files as well as ESRI Shapefiles that show the data extent and metadata for each of the original maps. These form an additional layer of metadata which can be used to aid data discoverability and quality control. The other sources of digitised map data are much less in number and data volume and generally do not come with the ancillary information (metadata, images and Shapefiles). Where possible these extra information have been produced at GA to maintain consistency with the AHO datasets. As at April 2007, the numbers of digitised maps are 2200 in number.

This tile contains all multibeam data held by Geoscience Australia on August 2012 within the specified area. The data has been gridded to 50m resolution. Some deeper data has also been interpolated within the mapped area. The image provided can be viewed on the free software CARIS Easyview, available from the CARIS website: www.caris.com under Free Downloads.

This tile contains all multibeam data held by Geoscience Australia on August 2012 within the specified area. The data has been gridded to 50m resolution. Some deeper data has also been interpolated within the mapped area. The image provided can be viewed on the free software CARIS Easyview, available from the CARIS website: www.caris.com under Free Downloads.

This tile contains all multibeam data held by Geoscience Australia on August 2012 within the specified area. The data has been gridded to 50m resolution. Some deeper data has also been interpolated within the mapped area. The image provided can be viewed on the free software CARIS Easyview, available from the CARIS website: www.caris.com under Free Downloads.