Brief description
The Seasonal ground cover statistics products are long-term temporal statistic products derived from the seasonal ground cover product for each fraction across Queensland for the 30 year timeseries. There is one raster image for each season and each bare and green fraction for the full time series of imagery available. Statistics include:
band 1 – 5th percentile minimum;
band 2 – mean value for pixel over full time series for that season only (percentage + 100);
band 3 – median value for pixel over full time series for that season only (percentage + 100);
band 4 – 95th percentile maximum;
band 5 – Standard deviation - the temporal standard deviation of the full time-series for that season only;
band 6 – Count - the number of observations statistics for that pixel are based on for that season only.
Min/max (5th and 95th percentile) products are also made for each fraction using all seasonal ground cover images available during the long term data period (currently 1990-2020).
Notes
Supplemental InformationProcessing stage:
dpj - bare min/max all seasons
dpk - green min/max all seasons
dpl - dry min/max all seasons
dpm - bare fraction summer stats
dpn - bare fraction autumn stats
dpo - bare fraction winter stats
dpp - bare fraction spring stats
dpq - green fraction summer stats
dpr - green fraction autumn stats
dps - green fraction winter stats
dpt - green fraction spring stats
Raster values indicate cover for the relevant fraction, in percent. The no data value is 255.
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.
Lineage
Landsat surface reflectance data > multiple single-date fractional cover datasets > seasonal composite of fractional cover > seasonal persistent green > seasonal composite of ground cover > seasonal ground cover statisticsData Creation
The long-term statistical summary products are derived from the seasonal ground cover product https://portal.tern.org.au/seasonal-ground-cover-australia-coverage/22022, also produced by the QLD DES remote sensing centre. The statistical products are derived from the full time series of imagery available for each season, defined by standard calendar seasons. For each pixel, the following statistics are calculated: 5th percentile, mean, median, 95th percentile, standard deviation and count.
Seasonal Statistics - 6 Band images:
band 1 - 5th percentile minimum - robust minimum value for that pixel over the length of the full time series for that season only (percentage + 100)
band 2 - mean value for pixel over full time series for that season only (percentage + 100)
band 3 - median value for pixel over full time series for that season only (percentage + 100)
band 4 - 95th percentile maximum - robust maximum value for that pixel over the length of the full time series for that season only (percentage + 100)
band 5 - Standard deviation - the temporal standard deviation of the full time-series for that season only
band 6 - Count - the number of observations statistics for that pixel are based on for that season only.
The first 4 bands are recorded with a scaling factor of 100 for data management purposes (to ensure there are no negative values in the image).
Min/Max Statistics - 2 Band images:
A two band image is produced for the Min/Max for full time series:
band 1 - 5th percentile minimum - robust minimum value for that pixel over the length of the full time series (percentage + 100)
band 2 - 95th percentile maximum - robust maximum value for that pixel over the length of the full time series (percentage + 100)
Notes
CreditWe 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 by the Joint Remote Sensing Research Program (https://www.jrsrp.org.au/) using data sourced from US Geological Survey.
These products display the variation of the seasonal ground cover fractions over long term temporal periods (e.g. 1990-2020).
These products are based upon the JRSRP Fractional Cover 3.0 algorithm.
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 approximately 4000 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 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>
Created: 2015-09-18
Issued: 2024-09-24
Modified: 2024-09-24
Data time period: 1990-01-01
text: Queensland
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Point-of-truth metadata URL
Trevithick, R., Scarth, P., Tindall, D., Denham, R. and Flood, N. (2014). Cover under trees: RP64G Synthesis Report. Department of Science, Information Technology, Innovation and the Arts. Brisbane.
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
doi :
https://doi.org/10.3390/rs5126481
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
doi :
https://doi.org/10.3390/rs5010083
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.
uri :
https://www.researchgate.net/publication/236022381_Field_measurement_of_fractional_ground_cover
- URI : geonetwork.tern.org.au/geonetwork/srv/eng/catalog.search#/metadata/b9c2e3d3-0dc4-4599-a1dd-6affb0ad3f74
- global : b9c2e3d3-0dc4-4599-a1dd-6affb0ad3f74
