Seasonal Trajectories, 10-daily

Seasonal Trajectories (ST) product is a filtered time series of <a href="https://www.nateko.lu.se/research/remote-sensing-and-earth-observation/lund-earth-observation-research-group/vegetation-phenology">Plant Phenology Index (PPI)</a> provided yearly on a 10-daily basis at 10m resolution . It is part of the Copernicus Land Monitoring Service (CLMS), pan-European High Resolution Vegetation Phenology and Productivity <a href="https://land.copernicus.eu/pan-european/biophysical-parameters/high-resolution-vegetation-phenology-and-productivity">(HR-VPP)</a> product suite. The Seasonal Trajectories PPI is derived through fitting a smoothing and gap filling function to the yearly time-series raw PPI values generated from Sentinel-2 satellite observations. In addition to the PPI band, a QFLAG band indicating the quality of the smoothing process is included. The Seasonal Trajectories provide the vegetation status for each pixel on a regular 10-day time step from January 1 2017 onwards over the EEA39 region. More information about ST product is outlined in the <a href="https://land.copernicus.eu/user-corner/technical-library/product-user-manual-of-seasonal-trajectories/">product user manual</a>

季节性轨迹（ST）产品系由植物物候指数（PPI）（Plant Phenology Index）构成的经过筛选的时间序列数据，该指数以每年10日一次的频率提供，分辨率为10米。该产品属于哥白尼陆地监测服务（Copernicus Land Monitoring Service，CLMS）下的全欧洲高分辨率植被物候与生产力（High Resolution Vegetation Phenology and Productivity，HR-VPP）产品系列。季节性轨迹PPI是通过将平滑和插值填充函数拟合至由哨兵-2卫星观测生成的年度时间序列原始PPI值而得到的。除了PPI波段外，还包括一个QFLAG波段，用以指示平滑过程的质量。季节性轨迹自2017年1月1日起，以10天为周期，提供了EEA39区域每个像素点的植被状况。有关ST产品的更多信息可参见产品用户手册<a href="https://land.copernicus.eu/user-corner/technical-library/product-user-manual-of-seasonal-trajectories/">产品用户手册</a>。