Darwin Harbour Habitat Mapping Program: Predicted seabed gravel content

This resource contains a predicted seabed gravel content grid for the greater Darwin Harbour region as part of a baseline seabed mapping program of Darwin Harbour and Bynoe Harbour. This project was funded through offset funds provided by an INPEX-led Ichthys LNG Project to the Northern Territory Government's Department of Environment and Natural Resources (NTG-DENR) with co-investment from Geoscience Australia (GA) and the Australian Institute of Marine Science (AIMS). The intent of this program is to improve knowledge of the marine environments in the Darwin and Bynoe Harbour regions by collating and collecting baseline data that enable the creation of thematic habitat maps and information to underpin marine resource management decisions. The predicted seabed gravel content grid was derived from a compilation of multiple surveys undertaken by GA, AIMS and NTG-DENR between 2011 and 2017, including GA0333 (Siwabessy et al., 2015), GA0341 (Siwabessy et al., 2015), GA0351/SOL6187 (Siwabessy et al., 2016), GA4452/SOL6432 (Siwabessy et al., 2017), GA0356 (Radke et al., 2017), and GA0358 and GA0359 (Radke et al., 2018), adding to those from a previous survey GA0333 collected by GA, AIMS and NTG-DENR. This dataset provides spatially continuous predictions of seabed %gravel (>2000 µm) content for the Darwin and Bynoe harbour region, northern Australian marine margin. Data are presented in 10 m resolution raster grids format and ascii text file. Predictions are based on 395 samples and 14 environmental variables derived from high resolution multibeam sonar bathymetry and backscatter data. Accuracy of predictions is high, with a VEcv = 59% for gravel; and the predictive accuracy has been increased by 68.4% for gravel in comparison with the commonly used method (i.e., IDW). Absences in predictions occur in this dataset as a result of non-availability associated with predictive variables. This dataset supersedes previous predictions of mud content for the Darwin and Bynoe harbour region with demonstrated improvements in predictive accuracy.

Simple

Identification info

Date (Creation)
2019-12-02
Date (Publication)
2020-01-15T03:08:19
Citation identifier
ga-dataSetURI/https://pid.geoscience.gov.au/dataset/ga/127109

Cited responsible party
Role Organisation / Individual Name Details
Author

Li, J.
Status
Completed
Spatial representation type

Spatial resolution

Level of detail

10 m

Topic category
  • Geoscientific information

Extent

Temporal extent

Time period
2011 2017

Extent

N
S
E
W


Maintenance and update frequency
As needed

Resource format

Title

Administration to complete

Date
Edition

Administration to complete

Distributor contact
Role Organisation / Individual Name Details
Distributor

Geoscience Australia

 Voice

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

  • gravel

Keywords

  • Darwin Harbour

Keywords

  • Habitat Mapping

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

Download the data (csv) [165 MB]

Download the data (csv) [165 MB]

OnLine resource

Download the data (esri ascii) [35 MB]

Download the data (esri ascii) [35 MB]

OnLine resource

Download the data (esri grid) [52.5 MB]

Download the data (esri grid) [52.5 MB]

OnLine resource

Link to collection record

Link to collection record

Resource lineage

Statement

Sediment samples were exported from Geoscience Australia’s Marine Sediments database (MARS). These samples and relevant high resolution multibeam sonar bathymetry and backscatter data were collected during marine surveys GA0356 (Radke et al., 2017), GA0358 and GA0359 (Radke et al., 2018), GA0351/SOL6187 (Siwabessy et al., 2016) and GA4452/SOL6432 (Siwabessy et al., 2017). Predicting the spatial distribution of gravel content at 10 m resolution was undertaken using the average of the hybrid method of random forest and ordinary kriging (rfok) and the hybrid method of random forest and inverse distance weighting (RFOKRFIDW). All predictions were generated using the R package, spm (Li, 2018). The spatial predictive models used were selected from the methods in spm based on their predictive accuracy for each sediment type. This dataset is published with the permission of the CEO, Geoscience Australia.

References:

Li, J., 2018. spm: Spatial Predictive Modelling. R package version 1.1.0. https://CRAN.R-project.org/package=spm.

Radke, L., Smit, N., Li, J., Hunt-Lew Fatt, K., Harries, S., Windsor, J., Nicholas, T., 2018. Benthic Sediment surveys of inner Darwin Harbour and shallow water areas in and around Bynoe Harbour (2018) - GA0358 and GA0359 – Post-survey report.

Radke, L., Smit, N., Li, J., Nicholas, T., Picard, K., 2017. Outer Darwin Harbour Shallow Water Sediment Survey 2016: GA0356 – Post-survey report: Record 2017/06. Geoscience Australia, Canberra. http://dx.doi.org/10.11636/Record.2017.006.

Siwabessy, J., Smit, N., Atkinson, I., dando, N., Harries, S., Howard, F.J.F., Li, J., Nicholas, W.A., Potter, A., Radke, L., Tran, M., Williams, D., Whiteway, T., 2016. Outer Darwin Harbour Marine Survey 2015: GA0351/SOL6187 Post-survey report: Geoscience Australia Record 2018/08. Geoscience Australia, Canberra, ACT, Australia., p. 117.

Siwabessy, P.J.W., Smit, N., Atkinson, I., Dando, N., Harries, S., Howard, F.J.F., Li, J., Nicholas, W.A., Picard, K., Radke, L.C., Tran, M., Williams, D., Whiteway, T., 2017. Bynoe Harbour Marine Survey 2016: GA4452/SOL6432 – Post-survey report. Record 2017/04. Geoscience Australia, Canberra. http://dx.doi.org/10.11636/Record.2017.004.

Hierarchy level
Dataset

Reference System Information

Reference system identifier
EPSG/WGS 84 / UTM zone 52S (EPSG:32752)

Metadata constraints

Title

Australian Government Security Classification System

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

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

Classification
Unclassified

Metadata

Metadata identifier
urn:uuid/4703aa88-9852-4106-bbb3-9e80967df64b

Title

GeoNetwork UUID

Type of resource

Resource scope
Dataset

Alternative metadata reference

Title

Geoscience Australia - short identifier for metadata record with

uuid

Citation identifier
eCatId/127109

Metadata linkage

https://ecat.ga.gov.au/geonetwork/srv/eng//metadata/4703aa88-9852-4106-bbb3-9e80967df64b

Metadata linkage

https://ecat.ga.gov.au/geonetwork/srv/eng/catalog.search#/metadata/4703aa88-9852-4106-bbb3-9e80967df64b

Date info (Creation)
2019-02-20T05:19:24
Date info (Revision)
2019-02-20T05:19:24

Metadata standard

Title

AU/NZS ISO 19115-1:2014

Metadata standard

Title

ISO 19115-1:2014

Metadata standard

Title

ISO 19115-3 (Draft Schemas 2015)

Edition date
2015-07-01T00:00:00
Title

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

Edition

Version 2.0, April 2015

 
 

Spatial extent

N
S
E
W


Keywords

Darwin Harbour Habitat Mapping gravel

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