Sovremennye problemy distantsionnogo zondirovaniya Zemli iz kosmosa, 2015, Vol. 12, No. 1, pp. 215-224
Comparison of reflectances of natural objects from Meteor-M No.1 Multispectral Satellite Imaging System and Terra MODIS spectroradiometer
T.V. Kondratieva
1 , B.S. Zhukov
1 , I.V. Polyansky
1 , A.A. Forsh
1 1 Space Research Institute RAS, Moscow, Russia
The multispectral satellite imaging system KMSS is operated on-board Meteor-M No.1 since September 2009. It consists of two MSU-100 cameras with a resolution of 60 m in three channels in the visible and near IR spectral ranges, optimized for monitoring land surfaces, and one MSU-50 camera with a resolution of 120 m in three channels in the visible range, optimized for imaging water surfaces. The KMSS cameras were radiometrically calibrated in-lab. The in-flight cross-calibration of KMSS with Terra MODIS is performed yearly using images of homogeneous snow cover on the high-altitude Antarctic Plateau with account for its scattering law.
Based on this cross-calibration, the KMSS and MODIS top-of-atmosphere reflectances of a wide range of natural objects on the territory of Russia are compared. For this purpose, images of the same areas were selected that were surveyed by KMSS and MODIS with a time interval of not more than 1–2 hours in stable atmospheric conditions. The reflectance recalculation between the KMSS and MODIS spectral bands was performed using the regression relationships that were obtained by reflectance spectra simulation of the surface-atmosphere system. In contrast to cross-calibration over the Antarctic, the difference in the sun and viewing angles at the time of KMSS and MODIS imaging was not accounted in this analysis. In spite of this, the results demonstrate a good correspondence between the reflectances of natural objects derived from data of KMSS and MODIS, with a root-mean-square deviation of no more than 0,022. The linear regression coefficient between the KMSS- and MODIS-based reflectances differs from 1 by no more than 4%, which is within the radiometric calibration accuracy of both KMSS (6-7%) and MODIS (5%).
Keywords: KMSS, multispectral satellite imaging system, Meteor_M No.1, MODIS, reflectance, in-flight radiometric calibration.
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