Day-1 INSAT-3DR Vicarious Calibration Using Reflectance-Based Approach Over Great Rann of Kutch

  • Piyushkumar N. PatelEmail author
  • K. N. Babu
  • R. P. Prajapati
  • Vikram Sitapara
  • A. K. Mathur
Research Article


This study describes the post-launch calibration for visible (VIS) and shortwave infrared (SWIR) bands of Indian National Satellite System (INSAT)-3DR imager over Great Rann of Kutch (GROK) on Day-1 (15th September 2016), when the first time INSAT-3DR Imager camera was switched on. In order to account the characterization of errors and undetermined post-launch changes in sensor spectral response, this calibration activity was performed and extended for its monitoring to Day-56 (since the Day-1; 09th November 2016). A reflectance based technique is used in the present study. The surface reflectance and atmospheric variables were measured over the site as per solar and viewing geometry of the INSAT-3D scan. Top of atmosphere (TOA) spectral radiances were computed using 6SV (second simulation of the satellite signal in the solar spectrum) radiative transfer code with the in situ measurements as well as spectral response function of each channel. Preliminary results of the Day-1 vicarious calibration yield gain coefficients of 0.974 and 0.820 for VIS and SWIR channels respectively despite the inhomogeneity of the ground target caused by sufficient sub-surface soil moisture. In extension of the present study, the obtained gain coefficients were 1.001 and 0.9887 for VIS and SWIR, respectively, during Day-56 which indicates the performance of sensor is within the range of pre-launch laboratory calibration.


INSAT-3DR Vicarious calibration Reflectance 6SV Radiative transfer model 



The authors gratefully acknowledge the encouragement received from Tapan Misra, Director, SAC for carrying out the present research work. Valuable suggestions received from Dr Raj Kumar, Deputy Director, EPSA is also gratefully acknowledged. Authors would like to thanks their respective families for their continuous motivations. The authors are grateful to anonymous reviewers for constructive and useful comments.


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Copyright information

© Indian Society of Remote Sensing 2018

Authors and Affiliations

  • Piyushkumar N. Patel
    • 1
    Email author
  • K. N. Babu
    • 1
  • R. P. Prajapati
    • 1
  • Vikram Sitapara
    • 1
  • A. K. Mathur
    • 1
  1. 1.Calibration and Validation Division, Space Applications CentreISROAhmedabadIndia

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