Geographic Reference of MTVZA-GYa Radiometric Remote-Sensing Data

• Published in: Izvestiya. Atmospheric and oceanic physics 2022-12, Vol.58 (12), p.1664-1674
• Main Authors: Sadovsky, I. N., Sazonov, D. S.
• Format: Article
• Language: English
• Subjects: Algorithms; Biological surveys; Climatology; Coordinate systems; Earth and Environmental Science; Earth Sciences; Geographic information systems; Geophysics/Geodesy; Inertial coordinates; Mathematical analysis; Measurement; Methods and Tools for Processing and Interpretation of Space Information; Orbital stability; Parameters; Pitch (inclination); Procedures; Radiometric measurement; Remote sensing; Rolling motion; Scanning; Spacecraft; Spacecraft stability; Vectors; Yaw; Yawing
• ISSN: 0001-4338; 1555-628X
• DOI: 10.1134/S0001433822120210

The procedure for geographic reference of the data of radiometric measurements of the MTVZA-GYa microwave scanner/sounder onboard the Meteor-M No. 2-2 spacecraft is described. Georeferencing is performed on the basis of the information contained in the instrument’s measurement data files (in .hdf format) (the observation time of each surface element, common for all frequency channels), as well as the description of the scanning scheme of this instrument, presented in scientific periodicals (sighting angles, scanning speed, etc.). As additional information, necessary to perform the georeferencing operation (orbit parameters, etc.), data freely available on the Internet are used. The georeferencing procedure consists of several sequentially performed operations, including determination of satellite coordinates in the inertial coordinate system, forming observation vectors in the instrumental coordinate system, determining the matrices of direct and inverse transitions for the six used coordinate systems, determination of the coordinates of the observation point in the inertial coordinate system, conversion of the coordinates to the Greenwich coordinate system, etc. In the presented form, it is possible to flexibly configure this operation, taking into account the instability of the orbit spacecraft position, variations in the instrument-scanning speed, instability of setting time stamps, errors in mounting the instrument on the spacecraft, etc. Also, the described georeferencing procedure can be used as part of automated algorithms for processing measurement data and procedures for searching for optimal values of the corrective parameters (for example, the roll, pitch, and yaw angles of the spacecraft and/or instrument).