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110 4. A Variational approach for the destriping issue
111 Chapitre 5 Application : Restoration of Aqua MODIS Band 6 5.1 Context In light of the destriping results reported in the chapter 3, it is clear that the quality of Aqua MODIS data is higher than that collected by Terra MODIS and have been given preference for many remote sensing applications including ocean colour product generation. This is mainly due to a better pre-launch calibration and limited non linear effects of the individual detectors response. Nevertheless, a major issue have been reported on one of Aqua MODIS bands. 15 of the 20 detectors of Aqua MODIS band 6 (data available at a resolution of 500 m) are either non functional or noisy. Non functional detectors do not measure any information and the resulting missing lines, in addition to functional detectors mis-calibrations, induces a sharp striping pattern accross the entire swath (figure 5.1). Due to the placement of band 6 (1.6281.652 µm) in the electromagnetic spectrum, many important applications are affected by this degradation. Two aerosol products, M and A-aerosols and the corresponding aerosol optical depth are derived over the ocean by the CERES Science Team using band 6 and band 1 [Tanre et al., 1997], [Ignatov et al., 2005]. Forest biomass estimation and canopy water stress also relie on SWIR range measurements [Fensholt and Sandholt, 2003]. The relationship between biomass and MODIS band 6 reflectance was characterized in [Baccini et al., 2004]. More importantly, in the context of climate change, the missing and noisy scans of Aqua MODIS band 6 is a serious problem for MODIS snow products. Snow cover information have gained attention of many scientific studies due to its impact on climate change. The spatial distribution and temporal evolution of snow provides a valuable information on the amount of snowmelt, used as input for water management applications and hydrological cycle studies. In addition, the Earth’s albedo, amount of solar energy reflected back into the atmosphere, is partially regulated the snow cover. Depending on their fractional cover, snow and ice high reflectivity acts as a shield against sun radiation thus reducing the Earth surface temperature. Most
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École Doctorale d’Informatique,
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5 Résumé Nou abordons dans cette
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8 TABLE DES MATIÈRES 3.5 Frequency
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10 TABLE DES MATIÈRES
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12 1. Introduction A common issue f
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14 1. Introduction
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16 2. Remote Sensing with MODIS In
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38 2. Remote Sensing with MODIS
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40 3. Standard destriping technique
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