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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
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
Role Organisation / Individual Name Details
Custodian

EGD

Owner

Commonwealth of Australia (Geoscience Australia)

Custodian

Commonwealth of Australia (Geoscience Australia)

Voice
Topic category
  • Environment

Extent

N
S
E
W


Maintenance and update frequency
As needed

Resource format

Title

Product data repository: Various Formats

Website

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
  • Marine Data

Theme
  • multibeam

Theme
  • marine survey

Theme
  • bathymetry

Theme
  • backscatter

Theme
  • marine environmental baselines

Keywords
  • AU-NT

Australian and New Zealand Standard Research Classification (ANZSRC)
  • Marine Geoscience

Keywords
  • Published_External

Resource constraints

Title

Creative Commons Attribution 4.0 International Licence

Alternate title

CC-BY

Edition

4.0

Website

http://creativecommons.org/licenses/

Access constraints
License
Use constraints
License

Resource constraints

Title

Australian Government Security ClassificationSystem

Edition date
2018-11-01T00:00:00
Website

https://www.protectivesecurity.gov.au/Pages/default.aspx

Classification
Unclassified
Language
English
Character encoding
UTF8

Distribution Information

Distributor contact
Role Organisation / Individual Name Details
Distributor

Commonwealth of Australia (Geoscience Australia)

Voice
OnLine resource

File download

Download the file

Distribution format
  • misc

Resource lineage

Statement

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

Legacy product, source data not available.

Extent

N
S
E
W


Metadata constraints

Title

Australian Government Security ClassificationSystem

Edition date
2018-11-01T00:00:00
Website

https://www.protectivesecurity.gov.au/Pages/default.aspx

Classification
Unclassified

Metadata

Metadata identifier
urn:uuid/1d77f2d0-d071-e6de-e053-10a3070ab1fd

Title

GeoNetwork UUID

Language
English
Character encoding
UTF8
Contact
Role Organisation / Individual Name Details
Point of contact

Commonwealth of Australia (Geoscience Australia)

Voice

Type of resource

Resource scope
Dataset
Name

dataset

Alternative metadata reference

Title

Geoscience Australia - short identifier for metadata record with

uuid

Citation identifier
eCatId/83951

Metadata linkage

https://ecat.ga.gov.au/geonetwork/srv/eng/catalog.search#/metadata/1d77f2d0-d071-e6de-e053-10a3070ab1fd

Date info (Revision)
2018-04-20T06:03:53
Date info (Creation)
2015-08-17T00:00:00

Metadata standard

Title

AU/NZS ISO 19115-1:2014

Metadata standard

Title

ISO 19115-1:2014

Metadata standard

Title

ISO 19115-3

Title

Geoscience Australia Community Metadata Profile of ISO 19115-1:2014

Edition

Version 2.0, September 2018

Citation identifier
https://pid.geoscience.gov.au/dataset/ga/122551

 
 

Spatial extent

N
S
E
W


Keywords

backscatter bathymetry marine environmental baselines marine survey multibeam

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Associated resources

Not available


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