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Performance of FAPAR Operational Products Derived From MERIS at the Full and Reduced Resolutions.

Nadine Gobron(1), Bernard Pinty(1), Ioannis Andredakis(1), Monica Robustelli(1) and Malcolm Taberner(1)

(1) EC-JRC, via E. Fermi, 2749, 21027 Ispra, Italy

Abstract

The assessment of the characteristics of both terrestrial surfaces and their temporal evolution requires high level products derived from space measurements. The accuracies of these products are in addition needed in the context of global change issues and regional terrestrial surfaces monitoring. Specifically the operational MEdium Resolution Imaging Spectrometer Instrument (MERIS) Level 2 land products, corresponding to the Fraction of Absorbed Photosynthetically Active Radiation (FAPAR), are available at both full (300 m) and reduce (1.2 km) resolution. The FAPAR value is estimated from daily MERIS spectral measurements acquired at the top-of-atmosphere, using a physically based approach. The quality assessment of the MERIS FAPAR products capitalizes on the availability of more than five years of data acquired globally. The validation is performed with a direct comparison of the FAPAR time series against ground-based estimations as well as similar FAPAR products derived from other optical sensor data. In the context of future instrument, we also analyze the impact of the spatial resolution on the performance results.

 

Workshop presentation

Keywords: ESA European Space Agency - Agence spatiale europeenne, observation de la terre, earth observation, satellite remote sensing, teledetection, geophysique, altimetrie, radar, chimique atmospherique, geophysics, altimetry, radar, atmospheric chemistry