Technical and methodological guide for updating corine land cover database
The two other products are defined as Essential Climate Variables (ECV), designated by the Global Climate Observing System (GCOS) and specifically monitored as relevant indicators for climate evolution studies and trend analysis.
FAPAR - Fraction of Absorbed Photosynthetically Active Radiation (ECV) In order to monitor the state and evolution of terrestrial vegetation cover, OLCI acquires multi-spectral imagery of the Earth.
A gap-filling method has been put in place by using 10 year mean estimates derived from equivalent BRDFs from MODIS and to complement the dataset.
It is likely that reflectances from OLCI would be used for such albedo derivation.
The associated land classification is defined according to the predominant type of vegetation found at that location (image courtesy of ESA GLOBCOVER project).
The land surface albedo is the proportion of the incident light that is reflected by the land surface.
Defined as an OLCI standard Level-2 product, the FAPAR is derived from the radiation measured over land surfaces.
LAI is therefore required as an input for several ecosystem process models.
Other approaches are used (automatic pixel-wise) as digital classification of the same type of pictures creating national land cover maps .
However, these approaches are costly and time-consuming, especially if applied at a European scale, as they use high spatial resolution images.
According to different case studies, a compromise between LANDSAT/SPOT and NOAA can be achieved using medium resolution images (i.e. The OLCI mission's land applications are designed to provide continuity with MERIS and MODIS.
ESA's GLOBCOVER initiative aims to develop and demonstrate a service for the generation of global land cover maps.
The environment in Europe is constantly changing due to a combination of socio-economic and climatic processes.