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30 2. Remote Sensing with MODIS Main application Band Spectral Center Spectral Width Land/Cloud/Aerosols Boundaries 1 645 nm 25 nm 2 856 nm 15 nm 3 469 nm 20 nm 4 555 nm 20 nm Land/Cloud/Aerosols Properties 5 1240 nm 20 nm 6 1640 nm 24 nm 7 2130 nm 50 nm 8 412 nm 15 nm 9 443 nm 10 nm 10 493 nm 10 nm 11 531 nm 10 nm Ocean Color/Phytoplankton 12 551 nm 10 nm 13 667 nm 10 nm 14 678 nm 10 nm 15 748 nm 10 nm 16 869 nm 15 nm 17 905 nm 30 nm Atmospheric Water Vapor 18 936 nm 10 nm 19 940 nm 50 nm 20 3.750 µm 0.180 µm Surface/Cloud Temperature 21 3.959 µm 0.030 µm 22 3.959 µm 0.030 µm 23 4.050 µm 0.060 µm Atmospheric Temperature 24 4.465 µm 0.065 µm 25 4.515 µm 0.067 µm 26 1.375 µm 0.030 µm Cirrus Clouds Water Vapor 27 6.715 µm 0.360 µm Cloud Properties 29 8.550 µm 0.300 µm Ozone 30 9.730 µm 0.300 µm Surface/Cloud Temperature 31 11.030 µm 0.500 µm 32 12.020 µm 0.500 µm 33 13.335 µm 0.300 µm Cloud Top Altitude 34 13.635 µm 0.300 µm 35 13.935 µm 0.300 µm 36 14.235 µm 0.300 µm Table 2.1 – MODIS spetral bands More details are provided in (Barnes et al., 1998).
31 Figure 2.10 – Main Components of the MODIS instrument Scan mirror assembly The energy from Earth radiation is reflected into the focal plane assembly via a double sidded scan mirror, composed of nickel-plated Beryllium. The rotation of the mirror at 20.3 rpm is ensured by a 2-phase brushless DC motor and the stability of its speed is monitored by a 14-bit optical encoder with an accuracy of 11- microradian . The system mirror-motor-encoder has been limited to a weight of 4.3 kg and only requires a power of 2.9 W. Focal plane assembly Dichroic beamsplitters are used to separate the scene radiation into 4 Focal Plane Assemblies (FPA) associated with each spectral region (VIS, NIR, SWIR-MWIR, LWIR). Each FPA contains detector arrays of pixels which size ranges from 135 to 540 µm. Bands with spatial resolution of 1 km have 10 detectors array, while bands at 250m and 500m, have 20 and 40 detectors. This is illustrated in figure 2.11. The FPAs are highly responsible for the presence of stripe noise in the images as striping originates partly from the miscalibration and non-linear responses of the pixels contained in the detector arrays. The onboard calibration system includes four complementary components : Solar Diffuser The solar diffuser (SD) is a pressed plate located in the forward part of the instrument and used for the calibration of the reflective bands. Periodically (once per orbit, at the north and south pole to avoid loss of data), the SD provides diffuse solar illumination to the scan mirror. Assuming a good characterization of the SD surface reflectance and precise estimation of the sun position, the solar diffuser radiance provides a stable source for absolute radiometric calibration.
Page 1: École Doctorale d’Informatique,
Page 5: 5 Résumé Nou abordons dans cette
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112 5. Application : Restoration of
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- Alaska Labrador Siberia Restorati
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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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