Product catalogue
Seascape classification layer from the Darwin Harbour 2011 Marine Survey (GA0333)
This dataset contains seascape classification layer derived from bathymetry and backscatter, and their derivative from seabed mapping surveys in Darwin Harbour. The survey was undertaken during the period 24 June to 20 August 2011 by iXSurvey Australia Pty Ltd for the Department of Natural Resources, Environment, The Arts and Sport (NRETAS) in collaboration with Geoscience Australia (GA), the Darwin Port Corporation (DPC) and the Australian Institute of Marine Science (AIMS) using GA's Kongsberg EM3002D multibeam sonar system and DPC's vessel Matthew Flinders. The survey obtained detailed bathymetric map of Darwin Harbour. Refer to the GA record ' Mapping and Classification of Darwin Harbour Seabed' for further information on processing techniques applied (GeoCat: 79212; GA Record: 2015/xx)
Simple
Identification info
- Date (Publication)
- 2015-01-01T00:00:00
- Citation identifier
- Geoscience Australia Persistent Identifier/https://pid.geoscience.gov.au/dataset/ga/83951
- Cited responsible party
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Role Organisation / Individual Name Details Author Siwabessy, J.
1 Author Tran, M.
2 Author Huang, Z.
3 Author Nichol, S.L.
4 Author Atkinson, I.
5
- Point of contact
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Role Organisation / Individual Name Details Custodian EGD
Owner Commonwealth of Australia (Geoscience Australia)
Custodian Commonwealth of Australia (Geoscience Australia)
Voice
- Topic category
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- Environment
Extent
))
- Maintenance and update frequency
- As needed
Resource format
- Title
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Product data repository: Various Formats
- Website
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Data Store directory containing the digital product files
Data Store directory containing one or more files, possibly in a variety of formats, accessible to Geoscience Australia staff only for internal purposes
- Keywords
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Marine Data
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- Theme
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multibeam
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- Theme
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marine survey
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- Theme
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bathymetry
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- Theme
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backscatter
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- Theme
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marine environmental baselines
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- Keywords
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AU-NT
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- Australian and New Zealand Standard Research Classification (ANZSRC)
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Marine Geoscience
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- Keywords
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Published_External
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Resource constraints
- Title
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Creative Commons Attribution 4.0 International Licence
- Alternate title
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CC-BY
- Edition
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4.0
- Access constraints
- License
- Use constraints
- License
Resource constraints
- Title
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Australian Government Security ClassificationSystem
- Edition date
- 2018-11-01T00:00:00
- Classification
- Unclassified
- Language
- English
- Character encoding
- UTF8
Distribution Information
- Distributor contact
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Role Organisation / Individual Name Details Distributor Commonwealth of Australia (Geoscience Australia)
Voice
- OnLine resource
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File download
Download the file
- Distribution format
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misc
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Resource lineage
- Statement
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Multiple spatial layers of physical data were classified using the Iterative Self Organising (ISO) Unsupervised Classification methodology available in ArcGIS (v.10). This methodology performs unsupervised classification based on a series of input raster bands using the ISO Cluster and Maximum Likelihood Classification tools. Datasets used in the derivation of the seabed habitat classification included bathymetry, slope, rugosity, backscatter and p rock.
Statistically, there are an optimum number of classes into which the data can be partitioned that minimises uncertainty. The method we used is called the Distance Ratio method. Classifications were carried out for 2 to 9 classes, with the distance ratio estimated for each class. The distance ratio is the ratio of the average of the mean distance of each class member from its class mean to the overall average distance of each member from the overall mean. This value provides an indication of how well the data matches the assigned classification. The optimal number of classes occurs where the distance ratio has a local minimum, indicating that the addition of more classes will not improve the classification accuracy as much as the addition of previous classes. Choosing fewer classes will not explain the variation in the classes as thoroughly.
- Hierarchy level
- Dataset
- Description
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Legacy product, source data not available.
Extent
Metadata constraints
- Title
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Australian Government Security ClassificationSystem
- Edition date
- 2018-11-01T00:00:00
- Classification
- Unclassified
Metadata
- Metadata identifier
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urn:uuid/1d77f2d0-d071-e6de-e053-10a3070ab1fd
- Title
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GeoNetwork UUID
- Language
- English
- Character encoding
- UTF8
- Contact
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Role Organisation / Individual Name Details Point of contact Commonwealth of Australia (Geoscience Australia)
Voice
Type of resource
- Resource scope
- Dataset
- Name
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dataset
Alternative metadata reference
- Title
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Geoscience Australia - short identifier for metadata record with
uuid
- Citation identifier
- eCatId/83951
- Date info (Revision)
- 2018-04-20T06:03:53
- Date info (Creation)
- 2015-08-17T00:00:00
Metadata standard
- Title
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AU/NZS ISO 19115-1:2014
Metadata standard
- Title
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ISO 19115-1:2014
Metadata standard
- Title
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ISO 19115-3
- Title
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Geoscience Australia Community Metadata Profile of ISO 19115-1:2014
- Edition
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Version 2.0, September 2018
- Citation identifier
- https://pid.geoscience.gov.au/dataset/ga/122551