Data

Linear Seasonal Persistent Green Trend - Landsat, QLD DES Algorithm, QLD and NT Coverage

Name: Linear Seasonal Persistent Green Trend - Landsat, QLD DES Algorithm, QLD and NT Coverage
Published: 2021

Terrestrial Ecosystem Research Network

Department of Environment and Science (2017-2023), Queensland Government

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ctx_ver=Z39.88-2004&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Adc&rfr_id=info%3Asid%2FANDS&rft_id=http://geonetwork.tern.org.au/geonetwork/srv/eng/catalog.search#/metadata/d48f5633-ca38-4e1f-9352-d7c191ceade9&rft.title=Linear Seasonal Persistent Green Trend - Landsat, QLD DES Algorithm, QLD and NT Coverage&rft.identifier=http://geonetwork.tern.org.au/geonetwork/srv/eng/catalog.search#/metadata/d48f5633-ca38-4e1f-9352-d7c191ceade9&rft.publisher=Terrestrial Ecosystem Research Network&rft.description=The linear seasonal persistent green trend is derived from analysis of the seasonal persistent green product over time. The current version is based on the 1987-2014 period. Seasonal persistent green cover is derived from seasonal fractional cover using a weighted smooth spline fitting routine. This weights a smooth line to the minimum values of the seasonal green cover. This smooth minimum is designed to represent the slower changing green component, ideally consisting of perennial vegetation including over-storey, mid-storey and persistent ground cover. The seasonal persistent green is then summarized using simple linear regression, and the slope of the fitted line is captured in this product. The original units are percentage points per year. Values are later truncated and scaled.Landsat surface reflectance data > multiple single-date fractional cover datasets > seasonal composite of fractional cover > seasonal persistent green product > linear seasonal persistent green trendData CreationPersistent Green Fractional Cover: 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 plus 100. Areas with frequent seasonal fractional cover data gaps due to cloud may produce unreliable estimates of persistent green cover.Linear Seasonal Persistent Green Trend: The seasonal persistent green product is summarised using simple linear regression, and the slope of the fitted line is captured in this product. The original units are percentage points per year. Values are later truncated and scaled.Progress Code: completedMaintenance and Update Frequency: periodic&rft.creator=Department of Environment and Science (2017-2023), Queensland Government &rft.date=2021&rft.edition=1.0&rft.relation=http://dx.doi.org/10.1080/14498596.2010.521977&rft.relation=https://doi.org/10.1201/b10275&rft.relation=https://scholar.google.com.au/scholar?hl=en&as_sdt=0,5&cluster=18286093203334628089&rft.relation=https://doi.org/10.1016/j.rse.2006.09.019&rft.relation=https://doi.org/10.3390/rs5126481&rft.relation=https://doi.org/10.3390/rs5010083&rft.relation=https://www.researchgate.net/publication/236022381_Field_measurement_of_fractional_ground_cover&rft.relation=https://doi.org/10.1109/38.19049&rft.relation=https://www.researchgate.net/deref/http%3A%2F%2Fdx.doi.org%2F10.6084%2FM9.FIGSHARE.94250&rft.relation=https://doi.org/10.1016/j.rse.2011.10.028&rft.coverage=Queensland and Northern Territory&rft.coverage=northlimit=-9.5; southlimit=-29.083908; westlimit=129.023438; eastLimit=154.5; projection=EPSG:4326&rft_rights=Creative Commons Attribution 4.0 International Licence http://creativecommons.org/licenses/by/4.0&rft_rights=&rft_rights=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. 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. Please advise any work or publications that use this data via the online form at https://www.tern.org.au/research-publications/#reporting&rft_rights=It is not recommended that these data sets be used at scales more detailed than 1:100,000.&rft_rights=Copyright 2010-2021. JRSRP. Rights owned by the Joint Remote Sensing Research Project (JRSRP).&rft_rights=While every care is taken to ensure the accuracy of this information, the Joint Remote Sensing Research Project (JRSRP) makes no representations or warranties about its accuracy, reliability, completeness or suitability for any particular purpose and disclaims all responsibility and all liability (including without limitation, liability in negligence) for all expenses, losses, damages (including indirect or consequential damage) and costs which might be incurred as a result of the information being inaccurate or incomplete in any way and for any reason.&rft_subject=imageryBaseMapsEarthCover&rft_subject=environment&rft_subject=LAND USE/LAND COVER CLASSIFICATION&rft_subject=VEGETATION COVER&rft_subject=ENVIRONMENTAL SCIENCE AND MANAGEMENT&rft_subject=ENVIRONMENTAL SCIENCES&rft_subject=ECOLOGICAL APPLICATIONS&rft_subject=LANDSAT-5&rft_subject=LANDSAT-7&rft_subject=LANDSAT-8&rft_subject=TM&rft_subject=ETM+&rft_subject=OLI&rft_subject=persistent green vegetation fraction (Percent)&rft_subject=Percent&rft_subject=30 meters - < 100 meters&rft_subject=Annual&rft.type=dataset&rft.language=English Access the data

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Licence & Rights:

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Creative Commons Attribution 4.0 International Licence
http://creativecommons.org/licenses/by/4.0

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.
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.

Please advise any work or publications that use this data via the online form at https://www.tern.org.au/research-publications/#reporting

It is not recommended that these data sets be used at scales more detailed than 1:100,000.

While every care is taken to ensure the accuracy of this information, the Joint Remote Sensing Research Project (JRSRP) makes no representations or warranties about its accuracy, reliability, completeness or suitability for any particular purpose and disclaims all responsibility and all liability (including without limitation, liability in negligence) for all expenses, losses, damages (including indirect or consequential damage) and costs which might be incurred as a result of the information being inaccurate or incomplete in any way and for any reason.

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Contact Information

Street Address:
Terrestrial Ecosystem Research Network
Building 1019, 80 Meiers Rd
QLD 4068
Australia
Ph: +61 7 3365 9097

esupport@tern.org.au

Brief description

The linear seasonal persistent green trend is derived from analysis of the seasonal persistent green product over time. The current version is based on the 1987-2014 period.
Seasonal persistent green cover is derived from seasonal fractional cover using a weighted smooth spline fitting routine. This weights a smooth line to the minimum values of the seasonal green cover. This smooth minimum is designed to represent the slower changing green component, ideally consisting of perennial vegetation including over-storey, mid-storey and persistent ground cover. The seasonal persistent green is then summarized using simple linear regression, and the slope of the fitted line is captured in this product. The original units are percentage points per year. Values are later truncated and scaled.

Notes

Supplemental Information
Filenames for the seasonal fractional cover product conforms to the AusCover standard naming convention. The standard form of this convention is:
___
For more information, see the file naming convention file provided with this dataset.

Lineage

Landsat surface reflectance data > multiple single-date fractional cover datasets > seasonal composite of fractional cover > seasonal persistent green product > linear seasonal persistent green trend

Data Creation
Persistent Green Fractional Cover: 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 plus 100. Areas with frequent seasonal fractional cover data gaps due to cloud may produce unreliable estimates of persistent green cover.
Linear Seasonal Persistent Green Trend: The seasonal persistent green product is summarised using simple linear regression, and the slope of the fitted line is captured in this product. The original units are percentage points per year. Values are later truncated and scaled.

Progress Code: completed

Maintenance and Update Frequency: periodic

Notes

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.
This dataset was produced in partnership with the Joint Remote Sensing Research Program using Landsat 5 TM, Landsat 7 ETM+ and Landsat 8 OLI satellite data sourced from the US Geological Survey.

Purpose
The trends in persistent green are considered to be indicators of change in woody vegetation cover. This linear seasonal persistent green trend product largely shows the effect of climate and rainfall on woody vegetation. To examine trends adjusted for rainfall, use the climate adjusted linear seasonal persistent green trend product.

Data Quality Information

Data Quality Assessment Scope
local : dataset
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. The fractional cover model was compared to samples drawn from 1500 field reference sites.

Data Quality Assessment Result
local : Quality Result
The USGS aims to provide image-to-image registration with an accuracy of 12m. Refer to the L8 Data Users Handbook for more detail. The fractional cover model achieved an overall model Root Mean Squared Error (RMSE) of 11.6% against field reference sites.

Created: 2013-11-25

Issued: 2021-09-22

Modified: 2024-09-23

Data time period: 1989-12-01 to 2014-12-31

This dataset is part of a larger collection

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text: Queensland and Northern Territory

Subjects

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Other Information

Point-of-truth metadata URL

uri : https://geonetwork.tern.org.au/geonetwork/srv/eng/catalog.search#/metadata/d48f5633-ca38-4e1f-9352-d7c191ceade9 External Link

Identifiers

URI : geonetwork.tern.org.au/geonetwork/srv/eng/catalog.search#/metadata/d48f5633-ca38-4e1f-9352-d7c191ceade9
global : d48f5633-ca38-4e1f-9352-d7c191ceade9