ISSN 2070-7401 (Print), ISSN 2411-0280 (Online)
Sovremennye problemy distantsionnogo zondirovaniya Zemli iz kosmosa


Sovremennye problemy distantsionnogo zondirovaniya Zemli iz kosmosa, 2014, Vol. 11, No. 2, pp. 123-137

In-flight radiometric cross-calibration of Multispectral Satellite Imaging System on-board Meteor-M No. 1 relative spectroradiometer MODIS on-board Terra

B.S. Zhukov1 , T.V. Kondrat’eva1 , I.V. Polyansky1 , L.I. Permitina2 
1 Space Research Institute RAS, Moscow, Russia
2 Research Center for Earth Operative Monitoring, Russian Federal Space Agency, Moscow, Russia
The multispectral satellite imaging system KMSS on-board Meteor-M No. 1 spacecraft consists of two 3-channel MSU-100 cameras with a spatial resolution of 60 m and one 3-channel MSU-50 camera with a spatial resolution of 120 m. The in-flight radiometric cross-calibration of the KMSS cameras relative spectroradiometer MODIS on-board Terra is performed yearly using images of homogeneous snow cover in the area with geographical coordinates of 70-80° S, 90-130° E on the high-altitude Antarctic Plateau. Simulations of the top-of-atmosphere spectral reflectance of various objects resulted in regressions between the reflectances measured in the spectral bands of KMSS and MODIS. Using the MODIS data, calibration functions are obtained that approximate the top-of-atmosphere snow reflectance as a function of the illumination and observations angles in each KMSS channel. Then the KMSS calibration is performed by comparing reflectances of Antarctic snow as measured by KMSS CCD linear arrays elements with the calibration functions. Averaging is performed over a few tens of thousands of reflectance measurements by each detector element. The relative KMSS radiometric calibration accuracy is estimated as ~2%, while the absolute accuracy as 6-7%. Absolute sensitivity distribution along the CCD line array of each KMSS channel is presented as obtained during the winter calibration session of 2012-2013. KMSS sensitivity variation during 2010-2013 was comparable to the calibration errors. More reliable conclusion on KMSS in-flight sensitivity degradation requires a longer time-series of observations.
Keywords: KMSS, MODIS, in-flight radiometric calibration, snow reflectance, snow BDRF
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