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Seasonal Persistent Green - Landsat, JRSRP Algorithm Version 3.0, Australia Coverage

An estimate of persistent green cover per season across Australia from 1989 to the present season, minus 2 years. This is intended to estimate the portion of vegetation that does not completely senesce within a year, which primarily consists of woody vegetation (trees and shrubs), although there are exceptions where non-woody cover remains green all year round. It is derived by fitting a multi-iteration minimum weighted smoothing spline through the green fraction of the seasonal fractional cover (dp1) time series. A single band image is produced: persistent green vegetation cover (in percent). The no data value is 255.

Simple

Identification info

Date (Creation)
2022-03-28
Date (Publication)
2022-05-03
Date (Revision)
2025-12-10
Edition
3.0

Publisher

Terrestrial Ecosystem Research Network
Building 1019, 80 Meiers Rd
Indooroopilly
QLD
4068
Australia
+61 7 3365 9097

Author

Department of the Environment, Tourism, Science and Innovation, Queensland Government
41 Boggo Road, Dutton Park, 4102, Queensland, Australia
Dutton Park
Queensland
4102
Australia

Rights holder

Joint Remote Sensing Research Program
Chancellors Place, St Lucia, Queensland, 4072, Australia
St Lucia
Queensland
4072
Australia
Website
https://www.tern.org.au/

Purpose
<p>This product captures variability in persistent green cover at seasonal (i.e. three-monthly) time scales, forming a consistent time series from 1989 to the present season (minus 2 years). It is useful for investigating inter-annual and longer term changes in persistent vegetation cover. The statistical process used to create this product means there is a 2-year lag in producing it.</p> <p></p> <p>For applications that focus on non-woody vegetation, the ground cover product, derived from fractional cover, may be more suitable.</p> <p>For applications investigating rapid change during a season, monthly composite or single-date (available on request) fractional cover products may be more appropriate.</p> <p></p> <p>This product is based upon the JRSRP Fractional Cover 3.0 algorithm.</p>
Credit
We at TERN acknowledge the Traditional Owners and Custodians throughout Australia, New Zealand and all nations. We honour their profound connections to land, water, biodiversity and culture and pay our respects to their Elders past, present and emerging.
Credit
<p></p>This dataset was produced by the Joint Remote Sensing Research Program using data sourced from US Geological Survey.
Status
On going

Point of contact

Department of the Environment, Tourism, Science and Innovation, Queensland Government - Data Enquiries, Earth Observation and Social Sciences (EOSS) ()
41 Boggo Road, Dutton Park, 4102, Queensland, Australia
41 Boggo Road
Dutton Park
Queensland
4102
Australia

Spatial resolution

Spatial resolution
30
Topic category
  • Environment
  • Imagery base maps earth cover

Extent

Description
Australia
N
S
E
W


Temporal extent

Time period
1989-12-01
Maintenance and update frequency
Quarterly
GCMD Science Keywords
  • VEGETATION COVER
  • LAND USE/LAND COVER
ANZSRC Fields of Research
  • Environmental management
  • Climate change impacts and adaptation
TERN Platform Vocabulary
  • LANDSAT-5
  • LANDSAT-7
  • LANDSAT-8
TERN Instrument Vocabulary
  • TM
  • ETM+
  • OLI
TERN Parameter Vocabulary
  • persistent green vegetation fraction
  • Percent
QUDT Units of Measure
  • Percent
GCMD Horizontal Resolution Ranges
  • 30 meters - < 100 meters
GCMD Temporal Resolution Ranges
  • Seasonal

Resource constraints

Use limitation
The Creative Commons Attribution 4.0 International (CC BY 4.0) license allows others to copy, distribute, display, and create derivative works provided that they credit the original source and any other nominated parties. Details are provided at https://creativecommons.org/licenses/by/4.0/
File name
88x31.png
File description
CCBy Logo from creativecommons.org
File type
png
Linkage
https://w3id.org/tern/static/cc-by/88x31.png

Title
Creative Commons Attribution 4.0 International Licence
Alternate title
CC-BY
Edition
4.0
Website
https://creativecommons.org/licenses/by/4.0/

Access constraints
License
Use constraints
Other restrictions
Other constraints
<p>TERN services are provided on an “as-is” and “as available” basis. Users use any TERN services at their discretion and risk. They will be solely responsible for any damage or loss whatsoever that results from such use including use of any data obtained through TERN and any analysis performed using the TERN infrastructure.<br />Web links to and from external, third party websites should not be construed as implying any relationships with and/or endorsement of the external site or its content by TERN.<br /><br />Please advise any work or publications that use this data via the online form at https://www.tern.org.au/research-publications/#reporting</p>
Other constraints
<p>It is not recommended that these data sets be used at scales more detailed than 1:100,000.</p>

Resource constraints

Classification
Unclassified
Supplemental Information
<p>Data are available as Cloud Optimised GeoTIFF (COG) files. COG files are easier and more efficient for users to access data corresponding to particular areas of interest without the need to download the data first.</p> <p>File naming convention:<br> Filenames for the seasonal persistent green product conform to the AusCover standard naming convention. The standard form of this convention is:</p> <p>{satellite category code}{instrument code}{product code}_{where}_{when}_{processing stage code}_{additional dataset specific tags}</p> <p>Details of the codes used for this dataset can be found in the attached txt file: File Naming Convention.</p> <p>Raster data values represent percentages of persistent green cover, with a no data value of 255.</p>

Distribution Information

Distribution format
  • NetCDF

Distributor

Distributor

Terrestrial Ecosystem Research Network
Building 1019, 80 Meiers Rd
Indooroopilly
QLD
4068
Australia
OnLine resource
File Naming Convention

Distribution Information

Distribution format

Distributor

Distributor

Terrestrial Ecosystem Research Network
80 Meiers Road, Indooroopilly, Queensland, 4068, Australia
Indooroopilly
Queensland
4068
Australia
OnLine resource
Cloud Optimised GeoTIFFs - Seasonal Persistent Green

OnLine resource
aus:persistent_green_v3

Persistent Green v3

OnLine resource
Landscape Data Visualiser - Seasonal Persistent Green - Landsat, JRSRP Algorithm Version 3.0, Australia Coverage

OnLine resource
Vegmachine Timeseries Viewer

OnLine resource
ro-crate-metadata.json

Data quality info

Hierarchy level
Dataset
Other
1) The input imagery was processed to level L1T by the USGS. Geodetic accuracy of the product depends on the image quality and the accuracy, number, and distribution of the ground control points.</br> 2) The fractional cover model was compared to samples drawn from approximately 4000 field reference sites.

Report

Result

Statement
1) The USGS aims to provide image-to-image registration with an accuracy of 12m. Refer to the <a href="https://www.usgs.gov/landsat-missions/landsat-8-data-users-handbook">Landsat 8 Data Users Handbook</a> for more detail.</br> 2) The fractional cover model predicts the vegetation cover fractions with MAE/wMAPE/RMSE of:</br> bare - 6.9%/34.9%/14.5% </br> PV - 4.6%/37.9%/10.6% </br> NPV - 9.8%/25.2%/16.9% </br>

Resource lineage

Statement
<p>Summary of processing:<br> Landsat surface reflectance data > multiple single-date fractional cover datasets > seasonal composite of fractional cover > seasonal persistent green product.
Hierarchy level
Dataset
Title
Flood, N., Danaher, T., Gill, T., & Gillingham, S. (2013). An Operational Scheme for Deriving Standardised Surface Reflectance from Landsat TM/ETM+ and SPOT HRG Imagery for Eastern Australia. Remote Sensing, 5(1), 83–109. https://doi.org/10.3390/rs5010083
Website
https://doi.org/10.3390/rs5010083

Method documentation

Title
Zhu, Z., & Woodcock, C. E. (2012). Object-based cloud and cloud shadow detection in Landsat imagery. Remote Sensing of Environment, 118, 83–94. https://doi.org/10.1016/J.RSE.2011.10.028
Website
https://doi.org/10.1016/J.RSE.2011.10.028

Method documentation

Title
Danaher, T., & Collett, L. (2006, November). Development, optimisation and multi-temporal application of a simple Landsat based water index. In Proceeding of the 13th Australasian Remote Sensing and Photogrammetry Conference, Canberra, ACT, Australia (Vol. 2024).
Website
https://trove.nla.gov.au/work/33486869

Method documentation

Title
Muir, J., Schmidt, M., Tindall, D., Trevithick, R., Scarth, P., & Stewart, J. B. (2011). Field measurement of fractional ground cover: A technical handbook supporting ground cover monitoring for Australia.
Website
https://www.researchgate.net/publication/236022381_Field_measurement_of_fractional_ground_cover

Method documentation

Title
Flood, N. (2013). Seasonal Composite Landsat TM/ETM+ Images Using the Medoid (a Multi-Dimensional Median). Remote Sensing, 5(12), 6481–6500. https://doi.org/10.3390/rs5126481
Website
https://doi.org/10.3390/rs5126481

Method documentation

Process step

Description
<p>Image Pre-Processing:<br> All input Landsat TM/ETM+/OLI imagery was downloaded from the USGS EarthExplorer website as level L1T imagery. Images which the EarthExplorer site rated as having greater than 80% cloud cover were not downloaded. The imagery has been corrected for atmospheric effects, and bi-directional reflectance and topographic effects, using the methods detailed by Flood et al (2013). The result is surface reflectance standardised to a fixed viewing and illumination geometry. Cloud, cloud shadow and snow have been masked out using the Fmask automatic cloud mask algorithm. Topographic shadowing has been masked using the Shuttle Radar Topographic Mission DEM at 30&nbsp;m resolution. Water has been masked out using the methods outlined in Danaher & Collett (2006).</p>

Process step

Description
<p>Fractional Cover Model:<br> A multilayer perceptron (MLP) model is used to estimate percentage cover in three fractions – bare ground, photosynthetic vegetation (PV) and non-photosynthetic vegetation (NPV) from surface reflectance, for every image captured within the season. The MLP model was trained with Tensorflow using Landsat TM, ETM+ and OLI surface reflectance and a collection of approximately 4000 field observations of overstorey and ground cover. The field observations covered a wide variety of vegetation, soil and climate types across Australia, collected between 1997 and 2018 following the procedure outlined in Muir et al (2011). The model was assessed to predict the vegetation cover fractions with MAE/wMAPE/RMSE of:<br> bare - 6.9%/34.9%/14.5% <br> PV - 4.6%/37.9%/10.6%</p>

Process step

Description
<p>Seasonal Compositing:<br> The method of compositing used selection of representative pixels through the determination of the medoid (multi-dimensional equivalent of the median) of three months (a season) of fractional cover imagery. The medoid is the point which minimises the total distance between the selected point and all other points. Thus the selected point is “in the middle” of the set of points. The value selected is a specific data point and not an averaged or blended value. It is robust against extreme values, inherently avoiding the selection of outliers, such as occurs when cloud or cloud shadow goes undetected. At least three pixels from the time-series of imagery for the season must be available. Unfortunately, due to the high level of cloud cover in some areas, often three cloud free pixels are not available, resulting in data gaps in the seasonal fractional cover image. For further details on this method see Flood (2013).</p>

Process step

Description
<p>Persistent Green Fractional Cover:<br> Smoothing splines are fitted in multiple iterations per pixel through the full time series of seasonal fractional cover (green fraction only). At each iteration, zero weight is given to observations that lie above the spline, and observation below the line are weighted proportion to the size of the residual. Observations greater than 3 standard deviations from the residual mean are given zero weight, and those between 2 and 3 standard deviations are given less weight, this avoids contamination by outliers. Persistent green fractional cover for each season is estimated from the final spline iteration at each seasonal time step. Values reported are as for fractional cover, ie. percentages of cover.<br> Areas with frequent seasonal fractional cover data gaps due to cloud may produce unreliable estimates of persistent green cover.<br> A single band (byte) image is produced: persistent green vegetation cover (in percent).</p>

Reference System Information

Reference system identifier
EPSG/EPSG:3577

Reference system type
Geodetic Geographic 2D

Metadata

Metadata identifier
urn:uuid/dd359b61-3ce2-4cd5-bc63-d54d2d0e2509

Title
TERN GeoNetwork UUID

Language
English
Character encoding
UTF8

Point of contact

Terrestrial Ecosystem Research Network
Building 1019, 80 Meiers Rd
Indooroopilly
QLD
4068
Australia
+61 7 3365 9097

Type of resource

Resource scope
Dataset
Metadata linkage
https://geonetwork.tern.org.au/geonetwork/srv/eng/catalog.search#/metadata/dd359b61-3ce2-4cd5-bc63-d54d2d0e2509

Point-of-truth metadata URL

Date info (Creation)
2022-03-28T00:00:00.000000+00:00
Date info (Revision)
2025-12-10T10:23:41.791630+00:00

Metadata standard

Title
ISO 19115-1:2014/AMD 1:2018 Geographic information - Metadata - Fundamentals
Edition
1

Metadata standard

Title
ISO/TS 19115-3:2016
Edition
1.0

Metadata standard

Title
ISO/TS 19157-2:2016
Edition
1.0
Title
Terrestrial Ecosystem Research Network (TERN) Metadata Profile of ISO 19115-3:2016 and ISO 19157-2:2016
Date (published)
2021
Edition
1.0

Identifier

Code
10.5281/zenodo.5652221
Website
https://github.com/ternaustralia/TERN-ISO19115/releases/tag/v1.0

 
 

Overviews

Spatial extent

N
S
E
W


Keywords

ANZSRC Fields of Research
Climate change impacts and adaptation Environmental management
GCMD Science Keywords
LAND USE/LAND COVER VEGETATION COVER

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