Fusing ground measurements and satellite-derived products for the construction of climatological maps in atmosphere optics

Mireille Lefèvre (1) , Jan Remund (2) , Michel Albuisson (3) , Thierry Ranchin (3) , Lucien Wald (1)

1 CEP/Sophia
2 Meteotest
3 CEP - Centre Énergétique et Procédés

Climatological maps (gridded data) of optical parameters of the atmosphere often result from application of numerical models or processing of satellite images. Such maps usually exhibit very large cell sizes, of the order of 1 of arc angle. There is a need to increase their spatial resolution to obtain a cell size closer to the spatial representation obtained by standard meteorological instruments at ground level, i.e. 5' of arc angle. It then permits to fuse ground measurements and gridded data, especially to correct for bias ob- served in gridded data. Taking advantage of the availability of other data sets of relevance to the parameter under concern, though different, a method is proposed for the synthesis of the initial gridded data at a higher resolution by the means of a fusion process. This paper describes the method with an application for the con- struction of worldwide maps of the Linke turbidity factor with cells of 5' in size. This factor characterises the atmospheric optical turbidity under clear skies and is a very important parameter in solar radiation studies.

Mots clés: atmosphere; environment; data fusion; ARSIS

Domaines: Traitement du signal et de l'image [eess.SP]; Sciences de la Terre; Océan, Atmosphère; Sciences de l'environnement; Traitement du signal et de l'image [eess.SP]

Mireille Lefèvre, Jan Remund, Michel Albuisson, Thierry Ranchin, Lucien Wald. Fusing ground measurements and satellite-derived products for the construction of climatological maps in atmosphere optics. 23rd EARSeL Annual Symposium "Remote Sensing in Transition", Jun 2003, Ghent, Belgium. pp.85-91. ⟨hal-00395054⟩