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Technology of prelaunch geometric calibration of multispectral imagery instruments of Russian geostationary satellites “Elektro-L”No.1 and No.2 is considered. Circular control points are used as a test field. Its geometrical model is developed to take distortions inthe collimator optical system into account. Multiple observations of a test field at different angles is used to cover the full visual fieldof a geostationary sensor. New algorithm of circular control point detection is developed and adapted to complex geometry ofgeostationary imagery. It is capable of processing images formed as a set of separate scans. Under calibration, sensor designparameters and also the law of scanning mirror motion are specified. The paper contains results of the technology approval underprelaunch calibration of MSU-GS sensors for geostationary operational meteorological satellites (GOMS) “Elektro-L” No.1 andNo.2

the international archives of the photogrammetry, remote sensing and spatial information sciences/international archives of the photogrammetry, remote sensing and spatial information sciences

PRELAUNCH PHOTOGRAMMETRIC CALIBRATION OF RUSSIAN SATELLITE ELEKTRO-L IMAGERY INSTRUMENTS