Seabed gravel, mud and sand content in the Browse region in the Australian continental EEZ 2014

This dataset provides the spatially continuous data of seabed gravel (sediment fraction >2000 µm), mud (sediment fraction < 63 µm) and sand content (sediment fraction 63-2000 µm) expressed as a weight percentage ranging from 0 to 100%, presented in 0.0025 decimal degree (dd) resolution raster grids format and ascii text file.


The dataset covers the Browse region in the Australian continental EEZ.


This dataset supersedes previous predictions of sediment gravel, mud and sand content for the basin with demonstrated improvements in accuracy. Accuracy of predictions varies based on density of underlying data and level of seabed complexity. Artefacts occur in this dataset as a result of insufficient samples in relevant regions. This dataset is intended for use at the basin scale. The dataset may not be appropriate for use at smaller scales in areas where sample density is insufficient to detect local variation in sediment properties. To obtain the most accurate interpretation of sediment distribution in these areas, it is recommended that additional samples be collected and predictions updated.

Simple

Identification info

Date (Publication)
2014-01-01T00:00:00
Citation identifier
Geoscience Australia Persistent Identifier/https://pid.geoscience.gov.au/dataset/ga/82527

Citation identifier
Digital Object Identifier/http://dx.doi.org/10.4225/25/5487C4CAD102A

Cited responsible party
Role Organisation / Individual Name Details
Publisher

Geoscience Australia

 Canberra
Author

Li, J.

 1
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
Not planned
Keywords

  • GIS Dataset

Theme

  • marine

Australian and New Zealand Standard Research Classification (ANZSRC)

  • Environmental Science and Management

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

Link to Data package - Seabed environments and shallow geology of the Leveque Shelf

Link to Data package - Seabed environments and shallow geology of the Leveque Shelf

OnLine resource

Download the ascii text files (csv)

Download the ascii text files (csv)

OnLine resource

Download the grids (ESRI ascii)

Download the grids (ESRI ascii)

Resource lineage

Statement

Sediment samples were exported from Geoscience Australia's Marine Sediments database (MARS), an Oracle database developed by Geoscience Australia in line with ANZLIC data standards. A subset of this data was selected for use in predicting spatial distribution of gravel, mud and sand content based on a set of data quality control criteria (see Li et al. 2010 and 2012). Predicting the spatial distribution of gravel, mud and sand content at a 0.0025 decimal degree resolution was undertaken using random forest (RF), a combined method of random forest and the ordinary kriging (RFOK), and the average of RFOK and RFIDW (i.e. a combined method of random forest and the inverse distance weighting) respectively (see Li et al. 2010, 2011 and 2012 for their definitions). The spatial prediction methods used were experimentally selected from over 40 methods/sub-methods based on assessment of predictive errors (Li et al. 2010, 2011 and 2012) and was refined for gravel, mud and sand respectively based on further experimental testing during May-June 2014 using datasets QCed in November 2013. The predictions in raster grids and ascii text file were generated in R. Final file is in WGS 84 coordinate system with a 0.0025 dd spatial resolution. File sizes are approximately 150 MB (raster grids) and 315 MB (ascii text) for each sediment type (i.e., gravel, mud and sand), with data dimensions of 3,681 (row) x 3,400 (column), 12,515,400 (cell) and 7043034 data points.

Hierarchy level
Dataset
Description

This dataset provides the spatially continuous data of seabed gravel (sediment fraction >2000 µm), mud (sediment fraction < 63 µm) and sand content (sediment fraction 63-2000 µm) expressed as a weight percentage ranging from 0 to 100%, presented in 0.0025 decimal degree (dd) resolution raster grids format and ascii text file.


The dataset covers the Browse region in the Australian continental EEZ.


This dataset supersedes previous predictions of sediment gravel, mud and sand content for the basin with demonstrated improvements in accuracy. Accuracy of predictions varies based on density of underlying data and level of seabed complexity. Artefacts occur in this dataset as a result of insufficient samples in relevant regions. This dataset is intended for use at the basin scale. The dataset may not be appropriate for use at smaller scales in areas where sample density is insufficient to detect local variation in sediment properties. To obtain the most accurate interpretation of sediment distribution in these areas, it is recommended that additional samples be collected and predictions updated.

Description

Description GEOGRAPHIC BOUNDING BOX

N_LAT: -11.517391171

S_LAT: -20.717391171

E_LONG: 125.999730028

W_LONG: 117.502230028

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/08bc892b-399e-3cb7-e054-00144fdd4fa6

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/82527

Metadata linkage

https://ecat.ga.gov.au/geonetwork/srv/eng/catalog.search#/metadata/08bc892b-399e-3cb7-e054-00144fdd4fa6

Date info (Revision)
2018-04-22T08:36:38
Date info (Creation)
2014-11-26T00:00:00

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

marine

Provided by

Access to the portal

Associated resources

Not available