Medium Resolution Vegetation Phenology and Productivity: Peak of season (raster 500m), Oct. 2022

The peak of season (POS), one of the Vegetation Phenology and Productivity (VPP) parameters, is a product of the pan-European Medium Resolution Vegetation Phenology and Productivity (MR-VPP) component of the Copernicus Land Monitoring Service (CLMS). The peak of season (POS) expresses the maximum Plant Phenology Index (PPI) values reached during the season. It is computed as the mean value of the times for which, respectively, the left edge has increased to the 80 % level and the right edge has decreased to the 80 % level. 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. 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 peak of season (POS) is one of the 13 parameters. The full list is available in the Product User Manual: https://land.copernicus.eu/user-corner/technical-library/clms_mrvpp_pum_d1-0.pdf The peak of season (POS) time series dataset is made available as raster files with 500x 500m resolution, in ETRS89-LAEA projection corresponding to the MCD43 tiling grid, for those tiles that cover the EEA38 countries and the United Kingdom and for two seasons in each year from 2000 onwards. It is updated in the first quarter of each year. The full on-line access to open and free data for this resource will be made available in the second half of 2024. Until then the data will be made available 'on-demand' by filling in the form at: https://land.copernicus.eu/contact-form季内峰值（Peak of Season, POS）是植被物候与生产力（Vegetation Phenology and Productivity, VPP）参数之一，是哥白尼陆地监测服务（Copernicus Land Monitoring Service, CLMS）旗下泛欧中分辨率植被物候与生产力（Medium Resolution Vegetation Phenology and Productivity, MR-VPP）模块的一款产品。 季内峰值（POS）表征植被生长季内植被物候指数（Plant Phenology Index, PPI）所能达到的最大值，其计算方式为植被生长季左边界上升至80%阈值、右边界下降至80%阈值的两个时刻的平均值。 植被物候指数（Plant Phenology Index, PPI）是基于物理机制构建的植被指数，旨在优化植被生长周期的监测工作。该指数以5天为卫星重访周期，首先通过函数拟合推导得到PPI季节轨迹。基于上述季节轨迹，可计算并输出共计13项植被物候与生产力（VPP）参数，每年最多可提供两个生长季的相关数据，季内峰值（POS）便是这13项参数之一。完整参数列表可查阅产品用户手册：https://land.copernicus.eu/user-corner/technical-library/clms_mrvpp_pum_d1-0.pdf 季内峰值（POS）时序数据集以栅格文件形式发布，空间分辨率为500米×500米，采用与MCD43分块网格匹配的ETRS89-LAEA投影，覆盖欧洲经济区38国及英国境内的对应分块，数据时间跨度为2000年至今，每年可提供两个生长季的数据。该数据集于每年第一季度完成更新。 本数据集的全量开放免费在线访问渠道将于2024年下半年上线。在此之前，用户可通过填写以下表单申请按需获取数据：https://land.copernicus.eu/contact-form