Monthly Blended Ground Cover version 3 - Landsat and Sentinel-2, JRSRP algorithm, Queensland coverage

The monthly blended fractional ground cover product is a spatially explicit raster product that shows the proportion of bare ground, green and non-green ground cover at medium resolution (30 m per-pixel) for each calendar month. It is derived directly from the blended monthly fractional cover product, also produced by Queensland's Remote Sensing Centre. \r\n\r\nThe seasonal fractional cover product predicts vegetation cover, but 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.\r\n\r\nWith 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

月度混合地表覆盖分数产品（monthly blended fractional ground cover product）是一类空间显式栅格产品（spatially explicit raster product），可展示各自然月内裸地、绿色地表与非绿色地表的覆盖占比，分辨率为中等尺度（每像素30米）。该产品直接衍生自同样由昆士兰州遥感中心（Queensland's Remote Sensing Centre）生产的混合月度覆盖分数产品。

季节尺度地表覆盖分数产品（seasonal fractional cover product）可预测植被覆盖情况，但无法区分乔木、中层木质植被的叶片与枝条覆盖与绿色、干地表覆盖。因此，即便在树木覆盖占比仅略高于15%的区域，地表覆盖的估算结果也会存在不确定性。

随着覆盖分数时间序列（fractional cover time-series）数据集的发展，通过时间序列分析推导“持久绿色植被（persistent green）”的估算值已成为可能。持久绿色植被产品可对植被长期稳定存在区域的垂直投影绿色植被占比（vertically-projected green-vegetation fraction）进行估算，这类区域一般为木质植被（woody vegetation）。将“持久绿色植被”从覆盖分数产品中分离后，可对覆盖分数影像的底层光谱特征（underlying spectral signature）进行校正，并生成各季节的“真实”地表覆盖估算结果。当前的覆盖估算仅限定于以下区域：