The general aim of WG2 is to improve the time-series processing of satellite sensor data for modelling vegetation processes related to seasonal productivity. This includes phenology (timing of vegetation growth stages) as well as the production of green foliage biomass and relationships with the carbon cycle. This aim will be achieved by using a combination of satellite data from old and new sensors (e.g. S2, S3), with temporal spectral observations from ground-based towers and instruments on lowflying aerial platforms (UAVs). By closing the temporal gap between day and season, a better understanding of the spatiotemporal changes of plant photosynthetic rate will be achieved linking the objectives of WG2 to those of WG1.