Sovremennye problemy distantsionnogo zondirovaniya Zemli iz kosmosa, 2018, Vol. 15, No. 4, pp. 71-77
Estimation of the stability of radiometric calibration of Multi-Channel Scanning Unit shortwave channels on board Meteor-M No. 2
A.A. Filei
1 , A.N. Rublev
2 , Yu.V. Kiseleva
2 1 Far-Eastern Center of State Research Center of Space Hydrometeorology “Planeta”, Khabarovsk, Russia
2 State Research Center “Planeta”, Moscow, Russia
Accepted: 08.07.2018
DOI: 10.21046/2070-7401-2018-15-4-71-77
In this paper, we have estimated the stability of radiometric calibration of Multi-Channel Scanning Unit (MSU-MR) shortwave channels on-board Meteor-M No. 2 from December 2014 to May 2018. We compared the top of atmosphere (TOA) reflectance of MSU-MR and Metop-A AVHRR channels. The AVHRR measurements were selected as a reference, because they are continually updated and are similar to MSU-MR spectral characteristics. The comparison of TOA reflectance was carried out over the regions of the Earth’s surface with high reflectivity in stable atmospheric conditions. The measurements of both satellites were chosen in such a way that the time difference between them did not exceed 20 minutes; the solar zenith angle (SZA) and view zenith angle (VZA) differed by 5 degrees or less. The differences in the spectral sensitivity functions of the shortwave channels of both instruments were taken into account when comparing TOA reflectances. As a result, we calculated the percentage of sensitivity loss for three MSU-MR shortwave channels for the period under review, that amounted to 23, 32 and 17 %. The rate of sensitivity loss was about 7.3, 9.8 and 5.1 % per year for each channel, respectively.
Keywords: MSU-MR, AVHRR, radiometric calibration, TOA reflectance
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