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38 2. Remote Sensing with MODIS
39 Chapitre 3 Standard destriping techniques and application to MODIS 3.1 Data The characteristics of stripe noise on the MODIS instrument are more complex than those observed on other imaging spectrometers. We shall see that early destriping techniques developped to improve the quality of Landsat MSS/TM images, provide unsatisfactory results for MODIS data. As illustrated in figure 2.12, images extracted from MODIS are contaminated with three different types of stripes, ubiquitous on few spectral bands. Although this increases the difficulties associated with destriping, it constitutes - in addition to the importance of MODIS in earth science research - a complementary motivation to explore new techniques. Despite a growing number of destriping methodologies, very few take into account particular cases of stripe noise. In fact, a major concern on MODIS is the presence of random stripes, so far discussed only in [Rakwatin et al., 2007]. In this chapter, we explore several techniques and we analyse the results obtained on images extracted from specific emissive bands of MODIS. The algorithms described in each section are applied on both Terra and Aqua level 1B TOA calibrated radiances. Given the considerable size of MODIS swaths (2330 km cross track ), we illustrate most of the results on 512 × 512 sub-images to allow accurate visual examination of small scale features. We specifically selected bands 27, 30 and 33 for Terra MODIS and bands 27, 30 and 36 for Aqua MODIS as they are representative of an extreme case due to severe striping with strong non-linear effects. All these bands display periodic stripes (mainly detector-to-detector), except band 33 of Terra MODIS which contains mostly random stripes. The data set used for this study is composed of three images for Terra MODIS and three images for Aqua MODIS, each extracted from a different spectral band (see figure 3.1). The scene captured by Terra MODIS was acquired on July 1 st , 2009 in the Mediterannean Sea. The images from Aqua MODIS were acquired on November
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128 Conclusion
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130 BIBLIOGRAPHIE A. Chambolle. An
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132 BIBLIOGRAPHIE E. Hochberg, S. A
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134 BIBLIOGRAPHIE P. Perona and J.
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