Métodos Inversos para el regrillado de imágenes satelitales de microondas pasivas en regiones costeras

RAJNGEWERC, MARIELA; BALI, JUAN LUCAS; GRIMSON, RAFAEL

Buenos Aires

Simposio; Reunión anual de la Unión Matemática Argentina; 2017

UMA

When a passive microwave footprint intersectsobjects on the ground with different spectral characteristics,the corresponding observation is mixed. The retrieval of geophysicalparameters is limited by this mixture. We propose topartition the study region into objects following an object-basedimage analysis procedure and then to refine this partition intosmall cells. Then, we introduce a statistical method to estimate thebrightness temperature (TB) of each cell. The method assumesthat TB of the cells corresponding to the same object is identicallydistributed and that the TB heterogeneity within each cellcan be neglected. The implementation is based on an iterativeexpectation?maximization algorithm. We evaluated the proposedmethod using synthetic images and applied it to grid the TBs ofsample AMSR−2 real data over a coastal region in Argentina.