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A Spectro-radiometric Analysis of Ocean Colour Sensors and Proposal for a Miniature Hyper Spectral Imager for Future

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Abstract

Ocean colour sensors traditionally are of fixed spectral channel systems with specified bandwidth of about 20 nm in the visible region and about 40 nm in Near Infrared region. In these systems, it is known that a radiometric error of 1% in the measurement of top of the atmosphere signal may lead to an error of 10% in the retrieved ocean upwelling radiance. In this paper we investigated the range of wavelengths participating in signal collection (effective spectral pass band, ESPB) using relative spectral response data of various sensors flown earlier. ESPB values were computed for each spectral channel for various percentages of signal and the results showed that they are quite high compared to bandwidths specified. These values were found to vary with sensor and channel. ESPB shall be small for accurate computation of spectral radiance. As the knowledge of spectral profile of the signal in the range of ESPB helps in better estimation of spectral radiance at the intended wavelengths, a miniature high performance linear variable filter based hyperspectral sensor is proposed as an alternative. We present here the design concept and report the estimated performance of such sensor that can be realized even with commercial off the shelf components for operational implementation.

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Acknowledgements

We are grateful to Indian Institute of Remote sensing (IIRS), Space Applications Centre (SAC) and National Remote Sensing Centre (NRSC) of ISRO and Doon University (DU) for supporting this research work. Our sincere thanks to Ocean Biology Processing Group of NASA’s Goddard Space Flight Centre (GSFC) for the RSR data of various sensors. We gratefully acknowledge the useful discussions we had with Dr Prakash Chauhan, Mr Nitesh Thapa, SAC, Dr Sameer Saran, IIRS, Dr Sarnam Sigh, IIRS and Dr Vijay Sridhar, DU.

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Authors and Affiliations

  1. Indian Institute of Remote Sensing (IIRS), Dehradun, India

    R. M. Samudraiah Desu, Ashutosh Kumar Jha & Senthil Kumar Arumugam

  2. National Remote Sensing Centre (NRSC), Hyderabad, India

    V. N. Krishna Murthy Yelisetty

  3. Doon University, Dehradun, India

    Ujjwal Kumar & Kusum Arunachalam

Authors
  1. R. M. Samudraiah Desu
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  2. Ashutosh Kumar Jha
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  3. Senthil Kumar Arumugam
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  4. V. N. Krishna Murthy Yelisetty
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  5. Ujjwal Kumar
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  6. Kusum Arunachalam
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Correspondence to R. M. Samudraiah Desu.

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Desu, R.M.S., Jha, A.K., Arumugam, S.K. et al. A Spectro-radiometric Analysis of Ocean Colour Sensors and Proposal for a Miniature Hyper Spectral Imager for Future. J Indian Soc Remote Sens 46, 895–902 (2018). https://doi.org/10.1007/s12524-017-0726-2

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  • DOI: https://doi.org/10.1007/s12524-017-0726-2

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