Print

Identification

Field Value

Title

Digital soil maps for key soil properties over New South Wales, version 2.0

Abstract

Digital soil maps (DSMs) are prepared through quantitative modelling techniques that are based on relationships between soil attributes and the environment. DSMs are presented over NSW for a range of key soil properties, including soil organic carbon (SOC), pH, cation exchange capacity, sum-of-bases, available phosphorous, bulk density, clay, silt and sand (total and fine). The maps are at 100 m spatial resolution and cover ten soil depth intervals down to 2 m, consistent with widely used Australian and international systems. Random Forest decision tree modelling techniques were applied. Validation results for the maps indicate generally moderate to high performance and effectiveness. Maps of mean plus upper 95% and lower 5% prediction limits are available. The maps provide at least a useful first approximation of these soil properties across the State. The products are described more fully in the technical report: Gray (2023), Digital soil mapping of key soil properties over NSW, version 2.0 (76p). The report and raster layers can be downloaded through the NSW environmental data portal SEED (https://www.seed.nsw.gov.au/) and are also viewable through the DPE soil and landscape spatial viewer eSPADE (http://espade.environment.nsw.gov.au ). All maps, including prediction limits and intervals, are also available through the DPE data broker.

Resource locator

Data Quality Statement

Name: Data Quality Statement

Protocol: WWW:DOWNLOAD-1.0-http--download

Description:

Data quality statement for Digital soil maps for key soil properties over New South Wales, version 2.0

Function: download

Technical report, April 2023

Name: Technical report, April 2023

Protocol: WWW:DOWNLOAD-1.0-http--download

Description:

Provides details on methodology, example maps with prediction intervals, validation results and discussion on the use of the products.

Function: download

SOC NSW DSMs to 1m

Name: SOC NSW DSMs to 1m

Protocol: WWW:DOWNLOAD-1.0-http--download

Description:

Digital maps of soil organic carbon to 1 m, as concentration (%), mass (kg/m3) and stocks (t/ha)

Function: download

pH NSW DSMs to 2m

Name: pH NSW DSMs to 2m

Protocol: WWW:DOWNLOAD-1.0-http--download

Description:

Digital soil maps of pH over NSW, multiple depths to 2 m

Function: download

Basic cations & CEC NSW DSMs

Name: Basic cations & CEC NSW DSMs

Protocol: WWW:DOWNLOAD-1.0-http--download

Description:

Digital soil maps for sum-of-bases and CEC over NSW, multiple depths to 2 m

Function: download

P bray NSW DSMs to 2m

Name: P bray NSW DSMs to 2m

Protocol: WWW:DOWNLOAD-1.0-http--download

Description:

Digital soil maps of available P (bray) over NSW, multiple depths to 2 m

Function: download

Bulk density NSW DSMs to 30cm

Name: Bulk density NSW DSMs to 30cm

Protocol: WWW:DOWNLOAD-1.0-http--download

Description:

Digital soil maps of bulk density (t/m3) over NSW, several depths to 30 cm

Function: download

Particle sizes NSW DSMs to 2m

Name: Particle sizes NSW DSMs to 2m

Protocol: WWW:DOWNLOAD-1.0-http--download

Description:

Digital soil maps for sand, silt and clay over NSW, multiple depths to 2 m

Function: download

DSM prediction limits NSW all properties

Name: DSM prediction limits NSW all properties

Protocol: WWW:DOWNLOAD-1.0-http--download

Description:

Digital soil maps of prediction limits (upper 95% and lower 5%) for all key soil properties over NSW, 0-30 cm depth

Function: download

Unique resource identifier

Code

22f358d9-e59f-4b00-8089-99aaa8d0f7d0

Presentation form

Model digital

Edition

version 2.0

Dataset language

English

Metadata standard

Name

ISO 19115

Edition

2016

Dataset URI

https://datasets.seed.nsw.gov.au/dataset/22f358d9-e59f-4b00-8089-99aaa8d0f7d0

Purpose

For better understanding and management of NSW soils and broader environmental protection

Status

Completed

Spatial representation type

grid

Spatial reference system

Code identifying the spatial reference system

4283

Spatial resolution

100 m

Classification of spatial data and services

Field Value

Topic category

Keywords

Field Value

Keyword set

keyword value

SOIL

SOIL-Chemistry

SOIL-Physics

Originating controlled vocabulary

Title

ANZLIC Search Words

Reference date

2008-05-16

Geographic location

West bounding longitude

141

East bounding longitude

154

North bounding latitude

-37.7

South bounding latitude

-28

NSW Place Name

all NSW

Vertical extent information

Minimum value

-100

Maximum value

2228

Coordinate reference system

Authority code

urn:ogc:def:cs:EPSG::

Code identifying the coordinate reference system

5711

Temporal extent

Begin position

1985-01-01

End position

N/A

Dataset reference date

Resource maintenance

Maintenance and update frequency

Not planned

Contact info

Contact position

Data Broker

Organisation name

NSW Department of Climate Change, Energy, the Environment and Water

Telephone number

131555

Email address

data.broker@environment.nsw.gov.au

Web address

https://www.nsw.gov.au/departments-and-agencies/dcceew

Responsible party role

pointOfContact

Quality and validity

Field Value

Lineage

The digital soil maps of the ten soil properties were prepared at multiple depth intervals down to 2 m. They were based on soil survey and laboratory data available over NSW. These data were randomly divided into training and validation subsets, at an approximate 80-20% ratio. Environmental covariate data representing the main soil forming factors (climate, geology, topography, land use/cover and age) were applied in the initial training models and final maps production. These were derived from environmental data grids covering the entire State with some site specific field survey data. The modelling and digital mapping applied Random Forest decision tree techniques, with 200 trees in each of 10 bootstrap runs. Upper 95% and lower 5% prediction limits of each map were also derived. Validation of the final digital soil maps was carried out using the independent validation data, with Lin's concordance correlation coefficient, RMSE, mean error and other standard statistical metrics.

Constraints related to access and use

Field Value

Limitations on public access

Responsible organisations

Field Value

Responsible party

Contact position

Data Broker

Organisation name

NSW Department of Climate Change, Energy, the Environment and Water

Telephone number

131555

Email address

data.broker@environment.nsw.gov.au

Web address

https://www.nsw.gov.au/departments-and-agencies/dcceew

Responsible party role

pointOfContact

Metadata on metadata

Field Value

Metadata point of contact

Contact position

Data Broker

Organisation name

NSW Department of Climate Change, Energy, the Environment and Water

Telephone number

131555

Email address

data.broker@environment.nsw.gov.au

Web address

https://www.nsw.gov.au/departments-and-agencies/dcceew

Responsible party role

pointOfContact

Metadata date

2024-02-26T13:21:06.661673

Metadata language