Medium Resolution Vegetation Phenology and Productivity: Base level value (raster 500m), Oct. 2022

The Base Level Value (Base level), 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 Base Level Value (Base level) is the average Plant Phenology Index (PPI) value of the minima before and after the growing season. 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 Base Level Value (Base level) 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 Base Level Value (Base level) 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基准水平值（Base level）作为植被物候与生产力（Vegetation Phenology and Productivity, VPP）参数中的一员，是哥白尼陆地监测服务（Copernicus Land Monitoring Service, CLMS）泛欧中分辨率植被物候与生产力（Medium Resolution Vegetation Phenology and Productivity, MR-VPP）模块的产出产品。 基准水平值指生长季前后极小值对应的植物物候指数（Plant Phenology Index, PPI）的平均值。 植物物候指数（PPI）是一种基于物理机制的植被指数，专为优化植被生长周期监测而研发。该指数以每5天一次的卫星重访周期获取数据，首先通过函数拟合推导得到PPI季节轨迹。基于此类季节轨迹，可计算并生成共计13项植被物候与生产力（VPP）参数，每年最多可覆盖两个生长季。基准水平值即为这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 基准水平值时序数据集以栅格文件形式提供，分辨率为500×500米，采用与MCD43分块网格匹配的ETRS89-LAEA投影坐标系，覆盖欧洲经济区38国（EEA38）及英国的对应分块，时间范围为2000年起的每年两个生长季。该数据集于每年第一季度进行更新。 本数据集的全量开放免费在线访问功能将于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