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MERIS/AATSR Synergy Algorithms for Cloud Screening, Aerosol Retrieval and Atmospheric Correction

Peter North(1), Carsten Brockmann(2), J├╝rgen Fischer(3), Luis Gomez-Chova(4), Will Grey(1), Jose Moreno(4), Rene Preusker(3) and Peter Regner(5)

(1) Swansea university, Singleton Park, Swansea SA2 0LS, United Kingdom
(2) Brockmann Consult, Max-Planck-Str. 2, 21502 Geesthacht, Germany
(3) Freie Universit├Ąt Berlin, Carl-Heinrich-Becker-Weg 6-10, 12165 Berlin, Germany
(4) Universitat de Valencia, Dr. Moliner 50, 46100, Valencia 46010, Spain
(5) ESA/ESRIN, Via Galileo Galilei, Frascati (Rm) 00044, Italy

Abstract

We present research on synergistic use of MERIS and AATSR imagery, with objectives (i) to define and evaluate algorithms for improved cloud screening, global aerosol retrieval and land atmospheric correction, (ii) to implement these algorithms within the BEAM toolbox, and (iii) to formulate recommendations for the exploitation of the Sentinel-3 OLCI and SLST instruments.

The MERIS and AATSR instruments onboard ENVISAT provide similar resolution and swath but complementary information, encompassing different spectral domains and viewing geometries. Substantial success has been obtained previously by a number of researchers in using the instruments independently; for example MERIS aerosol retrieval using spectral methods over known targets, and AATSR approaches using the dual-view capability. The research will explore the gain by using information from both instruments simultaneously to constrain atmospheric profile. Other potential synergies include cloud discrimination using both the oxygen absorption channels on MERIS, and SWIR and thermal information from AATSR, and improved atmospheric correction to surface reflectance.

Sentinel 3 will continue with similar instrument specifications for OLCI and SLST. The research aims to evaluate potential for operational use in this platform and to provide tools within the BEAM environment for wider testing and analysis by the research community.

 

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