VPP quality flag 2017-present (raster 10m and 100m), Europe, yearly, Nov. 2022 - adjusted to the HRL grid

The Quality Flag (QFLAG), one of the Vegetation Phenology and Productivity (VPP) parameters, is a product of the pan-European High Resolution Vegetation Phenology and Productivity (HR-VPP) component of the Copernicus Land Monitoring Service (CLMS). The Plant Phenology Index (PPI) is a physically based vegetation index, developed for improving the monitoring of the vegetation growth cycle. The PPI index values, with 5-day satellite revisit cycle, are first used in a function fitting to derive the PPI Seasonal Trajectories, which is a filtered time series with regular 10-day time step. From these Seasonal Trajectories, a suite of 13 Vegetation Phenology and Productivity (VPP) parameters are then computed and provided, for up to two seasons each year. The Seasonal Productivity is one of the 13 parameters. The full list is available in the table 3 of the Product User Manual in the below link section. The Quality Flag (QFLAG) is a quality indicator for the above set of 13 Vegetation Phenology and Productivity (VPP) parameters and provides a confidence level, that is described in table 4 of the same manual. The QFLAG dataset is made available as raster files with 10 x 10m and 100 x 100m resolutions, in ETRS89-LAEA projection corresponding to the HRL grid, for those tiles that cover the EEA38 countries and the United Kingdom and for two seasons in each year from 2017 onwards. It is updated in the first quarter of each year.质量标志（Quality Flag, QFLAG）作为植被物候与生产力（Vegetation Phenology and Productivity, VPP）参数之一，是哥白尼陆地监测服务（Copernicus Land Monitoring Service, CLMS）下属泛欧洲高分辨率植被物候与生产力（High Resolution Vegetation Phenology and Productivity, HR-VPP）组件的产出产品。 植物物候指数（Plant Phenology Index, PPI）是一款基于物理机理的植被指数，专为优化植被生长周期监测工作而开发。该指数数值以5天为卫星重访周期，首先通过函数拟合运算生成PPI季节轨迹（PPI Seasonal Trajectories）——这是一类经滤波处理、时间步长固定为10天的时序数据。基于上述季节轨迹，可计算并输出共计13项VPP参数，每年最多可覆盖两个生长季。其中季节生产力（Seasonal Productivity）即为该13项参数之一，完整参数清单可参阅下文链接章节中的《产品用户手册（Product User Manual）》表3。 QFLAG是上述13项VPP参数的质量评估指标，用于表征各参数的置信水平，相关说明详见同一份手册的表4。 QFLAG数据集以栅格文件形式发布，分辨率涵盖10×10米与100×100米两种，采用与HRL网格（HRL grid）匹配的ETRS89-LAEA投影坐标系。其覆盖范围为欧洲经济区38国（EEA38）与英国境内的对应瓦片，数据时间跨度为2017年起，每年包含两个生长季，且于每年第一季度完成更新。