Abstract
This paper presents a method based on the concept of temperature-independent spectral indices (TISI) to retrieve both the spectral emissivities and land surface temperature from AVHRR data. First, the bi-directional reflectivity (BDR) in channel 3 of AVHRR (3.7µm) is determined by extracting the solar reflection occuring in this channel during the day thanks to an elimination of the emitted radiation by a particular intercomparision between day and night TISI. Then, assuming that the angular dependence of this BDR is known, the emissivity in channel 3 can be derived, leading to a straightforward determination of the emissivities in channels 4 and 5 using the corresponding TISI. Kowning the emissivities in channels 4 and 5, the land surface temperature (LST) is deduced by the local split-window method. The sensibility of this method to atmospheric uncertainties is discussed. First results obtained from AVHRR data over Oran area in Northwestern Algeria are presented.
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© 1993 Springer-Verlag Berlin Heidelberg
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Becker, F., Li, ZL. (1993). Infrared Remote Sensing of Surface Temperature and Surface Spectral Emissivities. In: Chedin, A., Chahine, M.T., Scott, N.A. (eds) High Spectral Resolution Infrared Remote Sensing for Earth’s Weather and Climate Studies. NATO ASI Series, vol 9. Springer, Berlin, Heidelberg. https://doi.org/10.1007/978-3-642-84599-4_18
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DOI: https://doi.org/10.1007/978-3-642-84599-4_18
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