Title: Quality Assurance for Essential Climate Variables (QA4ECV): Validation Report for BS FAPAR AVHRR
Publisher: Publications Office of the European Union
Publication Year: 2018
JRC N°: JRC110486
ISBN: 978-92-79-77731-8
ISSN: 1831-9424
Other Identifiers: EUR 29076 EN
OP KJ-NA-29076-EN-N
URI: http://publications.jrc.ec.europa.eu/repository/handle/JRC110486
DOI: 10.2760/28321
Type: EUR - Scientific and Technical Research Reports
Abstract: The Joint Research Centre (JRC) retrieval algorithm is used to derive the Fraction of Absorbed Photosynthetically Active Radiation (FAPAR) from daily spectral measurements acquired by Advanced Very High Resolution Radiometer (AVHRR) onboard a series of National Oceanic and Atmospheric Administration (NOAA) platforms (Gobron 2017). The inputs data are the surface Bidirectional Reflectance Factors (BRFs), derived from the normalised surface reflectances provided by the Land Long Term Data Record (LTDR) project (http://ltdr.nascom.nasa.gov, Franch et al. (2017)). The methodology itself is based on previous JRC-FAPAR algorithms such as the ones developed for the Medium Resolution Instrument Sensor (MERIS) and the Ocean Land Colour Instrument (OLCI), except surface reflectances instead of top of atmosphere ones are used as inputs. The uncertainty computations follow the main principles de- scribed into the Quality Assurance Framework For Earth Observation (QA4EO) guidelines (QA4EO 2012), e.g. using the uncertainties propagation theory. This report concerns the validation of the QA4ECV-FAPAR-AVHRR products through quality control at global scale from daily to 10-days and monthly period at 0.05 deg. x0.05 deg. and 0.5 deg. x 0.5deg. spatial scale, with comparisons at local scale against other space products, i.e. LTDR AVHRR AVH15 (Claverie et al. 2016) and Two-stream Inversion Package (TIP) products (Pinty et al. 2011), using as inputs the MODIS Collection 6 surface albedo and `green' a priori, and ground-based measurements.
JRC Directorate:Sustainable Resources

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