12 August 2004 Experimental verification of a simple model for infrared spectral radiance of natural objects
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A simple model for the spectral radiance of various objects in the field was developed at IARD. The model was verified in a field experiment in which the spectral radiances from three types of natural objects, in the 8-12 micron wavelength band, were measured. The results were compared with spectra that were calculated according to the model. At first, a rather poor agreement between the results was observed. Calculating the in-situ spectral emissivity values of the objects by application of a temperature-emissivity method alleviated this problem considerably. Further analysis has shown that most of the residual disagreement between the results was due to incorrect predictions of the path radiance that were made by the MODTRAN 4 code. Good agreement between the calculated and the measured radiance values was achieved after recalculating the path radiance by a physically based method. Another interesting result was that the influence of the sky radiation was not negligible and had to be dealt with properly.
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Dan Sheffer, Dan Sheffer, Yigal Ultchin, Yigal Ultchin, } "Experimental verification of a simple model for infrared spectral radiance of natural objects", Proc. SPIE 5425, Algorithms and Technologies for Multispectral, Hyperspectral, and Ultraspectral Imagery X, (12 August 2004); doi: 10.1117/12.546470; https://doi.org/10.1117/12.546470

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