Seasonal Ground Cover version 3 - Landsat, JRSRP algorithm, Australian coverage

The seasonal 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 3-month calendar season. It is derived directly from the seasonal 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

季节性地表覆盖组分（seasonal fractional ground cover）产品是一类空间显性栅格产品，可展示以每3个月为一个自然季的各周期内，裸地、绿色地表与非绿色地表的覆盖占比，空间分辨率为中等分辨率（30米每像素）。该产品直接由昆士兰州遥感中心（Queensland's Remote Sensing Centre）生产的季节性覆盖组分（seasonal fractional cover）产品衍生而来。

该季节性覆盖组分产品仅可实现植被覆盖的预测，但无法区分树木、中层木质植被的叶片与枝条覆盖，以及绿色、干燥地表覆盖。因此，即便在树木覆盖占比仅超过15%的区域，地表覆盖的估算结果也会存在不确定性。

随着覆盖组分时间序列数据集的发展，通过时间序列分析获取“持久绿色”的估算值成为可能。持久绿色植被产品可对植被长期存续区域的垂直投影绿色植被占比进行估算，此类区域通常为木质植被。将“持久绿色”组分从覆盖组分产品中分离后，可对覆盖组分影像的底层光谱特征进行校正，并生成每一季的“真实”地表覆盖估算结果。地表覆盖的估算范围仅局限于