Potential groundwater dependent ecosystems in the South Nicholson - Georgina Basin identified using Landsat satellite data

<div>Groundwater dependent ecosystems (GDEs) rely on access to groundwater on a permanent or intermittent basis to meet some or all of their water requirements (Richardson et al., 2011). The <a href=" https://explorer-aws.dea.ga.gov.au/products/ga_ls_tc_pc_cyear_3">Tasseled Cap percentile products</a> created by Digital Earth Australia (2023) were used to identify potential GDEs for the South Nicholson-Georgina basins study area. These percentile products provide statistical summaries (10th, 50th, 90th percentiles) of landscape brightness, greenness and wetness in imagery acquired between 1987 and present day. The 10th percentile greenness and wetness represent the lowest 10% of values for the time period evaluated, e.g. 10th percentile greenness represents the least green period. In arid regions, areas that are depicted as persistently green and/or wet at the 10th percentile have the greatest potential to be GDEs. For this reason, and due to accessibility of the data, the 10th percentile Tasseled Cap greenness (TCG) and Tasseled Cap wetness (TCW) products were used as the basis for the assessment of GDEs for the South Nicholson-Georgina region. The 50th percentile greenness was utilised to create the coefficient of variance (CV) dataset.

This data release is an ESRI geodatabase, with layer files, including:

- combined classified 10th percentile greenness and wetness dataset (useful to identify potential groundwater dependent vegetation/other GDEs and differentiate between vegetation types)

- CV of 50th percentile greenness dataset (useful when used in conjunction with the combined product to help identify groundwater dependent vegetation)

For more information and detail on these products, refer to associated <a href=" https://dx.doi.org/10.26186/149377">report</a>.

</div><div><br></div><div><strong>References</strong></div><div>Digital Earth Australia (2023). <em><a href=" https://docs.dea.ga.gov.au/">Digital Earth Australia User Guide.</a></em></div><div>Richardson, S., E. Irvine, R. Froend, P. Boon, S. Barber, and B. Bonneville. 2011a. <em>Australian groundwater-dependent ecosystem toolbox part 1: Assessment framework.</em> Waterlines Report 69. Canberra, Australia: Waterlines.</div><div><br></div>

Identification info

Date (Creation): 2024-02-05T03:00:00

Date (Publication): 2024-08-07T21:35:43

Citation identifier: Geoscience Australia Persistent Identifier/https://pid.geoscience.gov.au/dataset/ga/149293

Citation identifier: Digital Object Identifier/https://dx.doi.org/10.26186/149293

Cited responsible party

Role	Organisation / Individual Name	Details
Publisher	Commonwealth of Australia (Geoscience Australia)	Voice
Author	Kilgour, P.	Internal Contact
Author	Symington, N.	Internal Contact

Purpose: To assist in the identification and characterisation of groundwater dependent ecosystems.

Status: Completed

Point of contact

Role	Organisation / Individual Name	Details
Resource provider	Minerals, Energy and Groundwater Division	External Contact
Point of contact	Commonwealth of Australia (Geoscience Australia)	Voice
Point of contact	Kilgour, P.	Internal Contact

Spatial representation type

Topic category

Geoscientific information

Extent

Maintenance and update frequency: Not planned

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

Project

EFTF – Exploring for the Future

Project

South Nicholson Basin

Project

Georgina Basin

Keywords

Remote sensing

Keywords

Landsat

Keywords

Groundwater Dependent Ecosystem

Keywords

Northern Territory

Keywords

groundwater dependent vegetation

Keywords

Tasseled Cap

theme.ANZRC Fields of Research.rdf

Groundwater hydrology

Keywords

Published_External

Resource constraints

Title: Creative Commons Attribution 4.0 International Licence

Alternate title: CC-BY

Edition: 4.0

Website

https://creativecommons.org/licenses/by/4.0/

Addressee

Role	Organisation / Individual Name	Details
User	Any

Use constraints: License

Use constraints: Other restrictions

Other constraints: (c) Commonwealth of Australia (Geoscience Australia) 2024

Resource 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

Classification system: Australian Government Security Classification System

Associated resource

Association Type: Informed

Title: Hydrogeology and groundwater systems of the South Nicholson and Georgina basins, Queensland and Northern Territory

Citation identifier: 149367

Citation identifier: 11f9f1ef-41d6-47d2-b9c8-6090aa18f307

Website

http://pid.geoscience.gov.au/dataset/ga/149367

Link to eCat metadata record landing page

Associated resource

Association Type: Operated on by

Title: South Nicholson - Georgina Basin Groundwater Dependent Ecosystems Imagery WMS

Citation identifier: 149831

Citation identifier: 7d047032-12fd-4140-a626-3156bcdd4774

Website

http://pid.geoscience.gov.au/service/ga/149831

Link to eCat metadata record landing page

Associated resource

Association Type: Operated on by

Title: South Nicholson - Georgina Basin Groundwater Dependent Ecosystems Imagery WCS

Citation identifier: 149832

Citation identifier: 93ee5157-d823-4b46-9dc3-136c76d3a492

Website

http://pid.geoscience.gov.au/service/ga/149832

Link to eCat metadata record landing page

Associated resource

Association Type: Operated on by

Title: South Nicholson - Georgina Basin Groundwater Dependent Ecosystems Imagery WMTS

Citation identifier: 149833

Citation identifier: 2bb7da11-2fe9-4581-9929-893563886721

Website

http://pid.geoscience.gov.au/service/ga/149833

Link to eCat metadata record landing page

Language: English

Character encoding: UTF8

Distribution Information

Distributor contact

Role	Organisation / Individual Name	Details
Distributor	Commonwealth of Australia (Geoscience Australia)	Voice facsimile

OnLine resource: Download Data (gdb png lyrx xml) [2.7 GB]

Download Data (gdb png lyrx xml) [2.7 GB]

Distribution format

gdb png lyrx xml)

File decompression technique

unzip

OnLine resource: South Nicholson - Georgina Basin Groundwater Dependent Ecosystems Imagery WMTS

South Nicholson - Georgina Basin Groundwater Dependent Ecosystems Imagery WMTS

Distribution format

OGC:WMTS

OnLine resource: South Nicholson - Georgina Basin Groundwater Dependent Ecosystems Imagery WCS

South Nicholson - Georgina Basin Groundwater Dependent Ecosystems Imagery WCS

Distribution format

OGC:WCS

OnLine resource: South Nicholson - Georgina Basin Groundwater Dependent Ecosystems Imagery WMS

South Nicholson - Georgina Basin Groundwater Dependent Ecosystems Imagery WMS

Distribution format

OGC:WMS

Resource lineage

Statement: <div>For the South Nicholson – Georgina Basin, both TCG and TCW were extracted from Digital Earth Australia (DEA) using the Geoscience Australia Landsat Tasselled Cap Percentile Calendar Year Collection 3 product for all available years (1987– Aug 2023). Since there is currently no multi-year summary product based on the Collection 3 data, as per the Collection 2 data, a <a href=" https://github.com/GeoscienceAustralia/GWB-GDE-DEA/tree/main/ExtractTCG_TCB_c3">script </a> was written in DEA Sandbox (<a href=" https://app.sandbox.dea.ga.gov.au/">https://app.sandbox.dea.ga.gov.au/</a>) to extract all years and calculate the median of the percentiles (10th, 50th, 90th) for the whole time period.<strong> </strong>For this study, a combination of the 10th percentiles of TCG and TCW were investigated, as they are more informative for identifying and characterising potential aquatic and terrestrial GDEs than each band individually. The 50th percentile greenness was also used to create the coefficient of variance (CV) dataset. </div><div><br></div><div>The datasets created include:</div><div><br></div><div>-      coefficient of variation of 50th percentile greenness dataset, created by modifying the above script and replacing ‘median’ with ‘std’ and ‘mean’ respectively, to acquire the standard deviation and mean for each pixel in the 50th percentile greenness datasets for the time period 1987 to 2022. These datasets were then loaded into a GIS and the CV dataset created by using the formula: CV = std/mean</div><div><br></div><div>-      combined scaled 10th percentile greenness and wetness dataset, created by scaling both the greenness and wetness 10th percentile datasets using the scaling formula z = (x – min) / (max – min), which were then added together.</div><div><br></div><div>-      classified 10th percentile greenness and wetness datasets (used as input for the combined classified dataset). These were created based on their normally distributed data using the mean and 0.5 standard deviations and classified into nine classes. </div><div><br></div><div>-      combined classified 10th percentile greenness and wetness dataset was created by combining the classified greenness and wetness datasets using the ESRI ArcPro ‘Combine’ tool. This resulted in a dataset having a two-digit code with the first number of the code corresponding to greenness and the second digit correspond to wetness (refer to Table 2.1, Kilgour et al., 2023).</div><div><br></div><div><strong>Reference</strong>:</div><div>Kilgour P and Dixon-Jain P (2024) Groundwater Dependent Ecosystems: Remote sensing methods for regional scale mapping and characterisation of terrestrial ecosystems. Record 2024/32. Geoscience Australia, Canberra. <a href=" https://dx.doi.org/10.26186/149377">https://dx.doi.org/10.26186/149377</a></div>

Reference System Information

Reference system identifier: EPSG/Geocentric Datum of Australia 1994 / geodetic (EPSG: 6283)

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/37bc00e7-57bd-4661-aa9d-9185455bd572

Title: GeoNetwork UUID

Language: English

Character encoding: UTF8

Contact

Role	Organisation / Individual Name	Details
Point of contact	Commonwealth of Australia (Geoscience Australia)	Voice
Point of contact	Kilgour, P.	Internal Contact

Type of resource

Resource scope: Dataset

Alternative metadata reference

Title

Geoscience Australia - short identifier for metadata record with

uuid

Citation identifier: eCatId/149293

Metadata linkage

https://ecat.ga.gov.au/geonetwork/srv/eng/catalog.search#/metadata/37bc00e7-57bd-4661-aa9d-9185455bd572

Date info (Creation): 2024-07-15T05:54:32

Date info (Revision): 2024-07-15T05:54:32

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: http://pid.geoscience.gov.au/dataset/ga/122551

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Read here the full details and access to the data.

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