2.5.1 Main principles
The SEVIRI sensor on board of the geostationary Meteosat Second Generation (MSG) platform registers scenes of the European and African continents every 15 minutes with a sub nadir resolution of 3 km. This resolution deteriorates towards the poles, reducing to an average of 5 km over the European continent.
The EUMETSAT multi-mission ground segment consists of the following components:
- a set of central facilities, located at EUMETSAT headquarters in Darmstadt, Germany
- a primary and a back-up ground station for satellite control and data acquisition
- a geographically distributed network of 7 so-called Satellite Application Facilities (SAFs).
LSA SAF derives a range of value-added images useful for terrestrial monitoring. They can be subdivided in three categories: agro-meteorological data (temperature, solar radiation, actual evapo¬transpiration, ...), vegetation products (fAPAR, fractional cover, LAI) and fire products (fire radiative power, ...). Some of these derived images still have high frequency (e.g. LST is generated at 15 minute intervals, radiation and ET every 30 minutes) while others are already “composited” to the daily time step (e.g. the three vegetation products). The data are treated separately for four separate regions, labelled as EURO (Europe), NAFR (northern Africa), SAFR (Africa below the equator) and SAME (South America). The derived images are still in the “raw satellite projection” but they can be remapped using the ancillary Lon/Lat-planes generated by EUMETSAT. LSA SAF distributes its results in the form of a continuous stream of small HDF5-files, which can be acquired either via “secure FTP” (sFTP) or via the EUMETcast broadcasting system. Each individual HDF5-file contains the information of one variable (e.g. solar radiation), time step (e.g. 48 files per day for ET but only one for LAI) and region (EURO, NAFR, SAFR, SAME).
2.5.2 Input data for MCYFS
For MCYFS, all agro-meteorological and vegetation products which are produced by the Land Surface Analysis (LSA) SAF hosted by the Portuguese Meteorological Institute in Lisbon are acquired: