Abstract

This dataset provides the spatially continuous data of predicted seabed mud content (sediment fraction finer than 63 µm) expressed as a weight percentage ranging from 0 to 100%, presented in 0.0025 decimal degree (dd) resolution raster grids format and an ascii text file. The dataset covers the north-northwest region of the Australian continental EEZ. This dataset supersedes previous predictions of seabed mud content for the region 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 areas. This dataset is intended for use at regional scale. The dataset may not be appropriate for use at local 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 interpolations updated.
Google map showing geographic bounding box with values North bound -8.88 East bound 142.15 West bound 112.92 South bound -25.53

Product Type/Sub Type

dataset

Constraints

Creative Commons Attribution 4.0 International Licence

IP Owner

Commonwealth of Australia (Geoscience Australia)

Author(s)

Date (publication)

2013-01-01T00:00:00

Product Type

dataset

Topic Category

oceans

GA Catalogue Number

76998 Product http://www.ga.gov.au/metadata-gateway/metadata/record/76998/

Keywords

Marine Data
seabed
sedimentology
NERP Marine Biodiversity Hub
marine
Marine Geoscience

Resource Language

English

Resource Character Set

utf8

Resource Security Classification

Geographic Extent

North bound
-8.88
East bound
142.15
West bound
112.92
South bound
-25.53

Lineage

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 content based on a set of data quality control criteria (see Li et al. 2010 and 2012). Predicting the spatial distribution of mud content at a 0.0025 decimal degree resolution was undertaken using a combined method of random forest and ordinary kriging (see Li et al. 2010, 2011a and 2012). The spatial interpolation method used was experimentally selected from over 40 methods/sub-methods based on assessment of predictive errors (Li et al. 2010, 2011a and 2012) and was refined for mud content based on further experimental testing during Nov 2012 to March 2013. The predictions in raster grids and as an ascii text file were generated in R. Final file is in WGS 84 coordinate system with a 0.0025 dd spatial resolution.

Digital Transfer Options

onLine

Distributor

Role
distributor
Organisation Name
Commonwealth of Australia (Geoscience Australia)
City
Canberra
Administrative Area
ACT
Postal Code
2601
Country
Australia
Email Address

Source Description

NERP Marine Biodiversity Hub

Metadata File Identifier

e3dd1af5-7af9-50fd-e044-00144fdd4fa6

Metadata Standard Name

ANZLIC Metadata Profile: An Australian/New Zealand Profile of AS/NZS ISO 19115:2005, Geographic information - Metadata

Metadata Standard Version

1.1

METADATA SECURITY CLASSIFICATION

Metadata Contact

Role
pointOfContact
Organisation Name
Commonwealth of Australia (Geoscience Australia)
City
Canberra
Administrative Area
ACT
Postal Code
2601
Country
Australia
Email Address