Authors / CoAuthors
Abstract
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.
Product Type
nonGeographicDataset
eCat Id
67172
Contact for the resource
Custodian
Point of contact
Cnr Jerrabomberra Ave and Hindmarsh Dr GPO Box 378
Canberra
ACT
2601
Australia
Keywords
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- Marine Map
- Australian and New Zealand Standard Research Classification (ANZSRC)
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- Marine Geoscience
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- Published_Internal
Publication Date
2008-07-14T00:00:00
Creation Date
Security Constraints
Legal Constraints
Status
Purpose
Maintenance Information
continual
Topic Category
geoscientificInformation
Series Information
Lineage
The derived depth data holdings at GA are maintained so that GA projects can produce maps and grids that don't contain areas of no data. The larger derived depth datasets can also be used as backdrops on maps of other datasets, so that the context of project areas can be visualised. Initially only the ETOPO2 grid was used. However some people preferred the GEBCO grid so it was added. With the advent of interest in coastal areas, sources of shallow water data were sought to fill in the gaps of conventional data coverage in these areas. Hopefully over time, the derived data holdings can be replaced with actual soundings data.
Parent Information
Extents
[-80.0, -5.0, 45.0, 180.0]
Reference System
Spatial Resolution
Service Information
Associations
Downloads and Links
Source Information
Source data not available.