Printed from the TERN Data Discovery portalhttp://portal.tern.org.au/seasonal-ground-cover-australia-coverage/22022
154.5,-9.5 154.5,-44.5 112.5,-44.5 112.5,-9.5 154.5,-9.522022
The seasonal fractional ground cover product shows the proportion of bare ground, green and non-green ground cover and is derived directly from the seasonal fractional cover product, also produced by Queensland's Remote Sensing Centre. The seasonal fractional cover product is a spatially explicit raster product, which predicts vegetation cover at medium resolution (30 m per-pixel) for each 3-month calendar season. However, the seasonal fractional cover product does not distinguish tree and mid-level woody foliage and branch cover from green and dry ground cover. As a result, in areas with even minimal tree cover (>15%), estimates of ground cover become uncertain. With the development of the fractional cover time-series, it has become possible to derive an estimate of ‘persistent green’ based on time-series analysis. The persistent green vegetation product provides an estimate of the vertically-projected green-vegetation fraction where vegetation is deemed to persist over time. These areas are nominally woody vegetation. This separation of the 'persistent green' from the fractional cover product, allows for the adjustment of the underlying spectral signature of the fractional cover image and the creation of a resulting 'true' ground cover estimate for each season. The estimates of cover are restricted to areas of <60% woody vegetation. Currently, this is an experimental product which has not been fully validated.
This dataset was produced by the Joint Remote Sensing Research Program using data sourced from US Geological Survey.
This product captures variability in ground cover at seasonal (ie three-monthly) time scales, forming a consistent time series from 1989 - present. It is useful for investigating inter-annual changes in ground cover and analysing regional comparisons. The green and non-green fractions may include a mix of woody and non-woody vegetation. For applications that focus on all vegetation, the fractional cover product may be more suitable. For applications investigating rapid change during a season, monthly composite or single-date (available on request) fractional cover products may be more appropriate. Note: A new fractional cover algorithm will be implemented during 2021, based on additional field validation and a new machine learning approach. This will lead to a new version of the ground cover products.
Summary of processing: Landsat surface reflectance data > multiple single-date fractional cover datasets > seasonal composite of fractional cover > seasonal persistent green > seasonal composite of ground cover
Further details are provided in the Methods section.
From 1989-12-01 To Not provided
How to cite this collection:
Department of Environment and Science, Queensland Government (2014): Seasonal ground cover - Landsat, JRSRP algorithm, Australia Coverage. Version 1.0.0. Terrestrial Ecosystem Research Network (TERN). dataset. https://portal.tern.org.au/seasonal-ground-cover-australia-coverage/22022
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