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<p>The radiometric performance of Ocean Colour Monitor onboard EOS-06 (OceanSat-3) using case-1 water calibration and validation site at Kavaratti has been carried out during its initial period (1st December 2022–30th May 2023). The operational atmospheric correction algorithm is used to simulate the sensor radiance using in-situ measurements of water leaving radiance and aerosol. The percentage of relative difference is higher (~ 6%) for the chlorophyll channels (2–4) and its reference band (5) shows ~ 7%, the NIR channel of OCM3 showed a&#xa0;4 to 5% relative absolute difference between the simulated and measurements with 0.98 coefficient of correlation. The vicarious gain coefficients corrected TOA radiance of OCM3 radiance are closely matches with the simulation. As these coefficients were computed for the initial observation dates of OCM3 sensor using the&#xa0;Kavaratti site, this can be termed as initial OCM3 radiometric performance and could be used to produce more accurate spectral radiances at&#xa0;the sensor level.</p>

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Initial Vicarious Calibration of Ocean Colour Monitor Onboard EOS-06 Using Ocean Site, Kavaratti

  • 期刊论文

  • 发表日期：

    2025年6月26日

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  • K. N. Babu,
  • Saurabh Tripathi,
  • Moosa Ali,
  • Anurag Gupta,
  • Debojyoti Ganguly,
  • Ankur Garg,
  • Tushar Shukla,
  • Pradeep Kumar Thapliyal,
  • Rashmi Sharma,
  • Mini Raman,
  • M. Arul Muthiah

摘要

The radiometric performance of Ocean Colour Monitor onboard EOS-06 (OceanSat-3) using case-1 water calibration and validation site at Kavaratti has been carried out during its initial period (1st December 2022–30th May 2023). The operational atmospheric correction algorithm is used to simulate the sensor radiance using in-situ measurements of water leaving radiance and aerosol. The percentage of relative difference is higher (~ 6%) for the chlorophyll channels (2–4) and its reference band (5) shows ~ 7%, the NIR channel of OCM3 showed a 4 to 5% relative absolute difference between the simulated and measurements with 0.98 coefficient of correlation. The vicarious gain coefficients corrected TOA radiance of OCM3 radiance are closely matches with the simulation. As these coefficients were computed for the initial observation dates of OCM3 sensor using the Kavaratti site, this can be termed as initial OCM3 radiometric performance and could be used to produce more accurate spectral radiances at the sensor level.