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Proceedings Paper

Site characterization for calibration of radiometric sensors using vicarious method
Author(s): Shailesh Parihar; L. S. Rathore; M. Mohapatra; A. K. Sharma; A. K. Mitra; R. Bhatla; R. S. Singh; Yogdeep Desai; Shailendra S. Srivastava
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Paper Abstract

Radiometric performances of earth observation satellite/sensors vary from ground pre-launch calibration campaign to post launch period extended to lifetime of the satellite due to launching vibrations. Therefore calibration is carried out worldwide through various methods throughout satellite lifetime. In India Indian Space Research Organization (ISRO) calibrates the sensor of Resourcesat-2 satellite by vicarious method. One of these vicarious calibration methods is the reflectance-based approach that is applied in this study for radiometric calibration of sensors on-board Resouresat-2 satellite. The results of ground-based measurement of atmospheric conditions and surface reflectance are made at Bap, Rajasthan Calibration/Validation (Cal/Val) site. Cal/Val observations at site were carried out with hyper-spectral Spectroradiometer covering spectral range of 350nm- 2500nm for radiometric characterization of the site. The Sunphotometer/Ozonometer for measuring the atmospheric parameters has also been used. The calibrated radiance is converted to absolute at-sensor spectral reflectance and Top-Of-Atmosphere (TOA) radiance. TOA radiance was computed using radiative transfer model ‘Second simulation of the satellite signal in the solar spectrum’ (6S), which can accurately simulate the problems introduced by the presence of the atmosphere along the path from Sun to target (surface) to Sensor. The methodology for band averaged reflectance retrieval and spectral reflectance fitting process are described. Then the spectral reflectance and atmospheric parameters are put into 6S code to predict TOA radiance which compare with Resourcesat-2 radiance. Spectral signature and its reflectance ratio indicate the uniformity of the site. Thus the study proves that the selected site is suitable for vicarious calibration of sensor of Resourcesat-2. Further the study demonstrates the procedure for similar exercise for site selection for Cal/Val analysis of other satellite over India region.

Paper Details

Date Published: 2 May 2016
PDF: 6 pages
Proc. SPIE 9881, Earth Observing Missions and Sensors: Development, Implementation, and Characterization IV, 98811K (2 May 2016); doi: 10.1117/12.2223997
Show Author Affiliations
Shailesh Parihar, India Meteorological Dept. (India)
L. S. Rathore, India Meteorological Dept. (India)
M. Mohapatra, India Meteorological Dept. (India)
A. K. Sharma, India Meteorological Dept. (India)
A. K. Mitra, India Meteorological Dept. (India)
R. Bhatla, Banaras Hindu Univ. (India)
R. S. Singh, Banaras Hindu Univ. (India)
Yogdeep Desai, Space Applications Ctr. (India)
Shailendra S. Srivastava, Space Applications Ctr. (India)

Published in SPIE Proceedings Vol. 9881:
Earth Observing Missions and Sensors: Development, Implementation, and Characterization IV
Xiaoxiong J. Xiong; Saji Abraham Kuriakose; Toshiyoshi Kimura, Editor(s)

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