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      https://www.ias.ac.in/article/fulltext/jess/111/03/0189-0195

    • Keywords

       

      IRS-P4 OCM; suspended sediment concentration; advective velocity; maximum cross-correlation; co-registration

    • Abstract

       

      The Indian remote sensing satellite, IRS-P4 (Oceansat-I) launched on May 26th, 1999 carried two sensors on board, i.e., the Ocean Colour Monitor (OCM) and the Multi-frequency Scanning Microwave Radiometer (MSMR) dedicated for oceanographic research. Sequential data of IRS-P4 OCM has been analysed over parts of both east and west coast of India and a methodology to retrieve sea surface current velocities has been applied. The method is based on matching suspended sediment dispersion patterns, in sequential two time lapsed images. The pattern matching is performed on a pair of atmospherically corrected and geo-referenced sequential images by Maximum Cross-Correlation (MCC) technique. The MCC technique involves computing matrices of cross-correlation coefficients and identifying correlation peaks. The movement of the pattern can be calculated knowing the displacement of windows required to match patterns in successive images. The technique provides actual flow during a specified period by integrating both tidal and wind influences. The current velocities retrieved were compared with synchronous data collected along the east coast during the GSI cruise ST-133 of R.V. Samudra Kaustubh in January 2000. The current data were measured using the ocean current meter supplied by the Environmental Measurement and CONtrol (EMCON), Kochi available with the Geological Survey of India, Marine Wing. This current meter can measure direction and magnitude with an accuracy of ±5‡ and 2% respectively. The measurement accuracies with coefficient of determination (R2) of 0.99, for both magnitude (cm.s-1) and direction (deg.) were achieved.

    • Author Affiliations

       

      J S Prasad1 2 A S Rajawat1 Yaswant Pradhan1 O S Chauhan3 S R Nayak1

      1. Marine and Water Resources Group, Remote Sensing Applications Area, Space Applications Centre (ISRO), Ahmedabad - 380 015, India
      2. Applied Geophysical Laboratories, Department of Geophysics, University of Houston, Texas - 77204, USA
      3. Geological Oceanography Division, National Institute of Oceanography, Dona Paula, Goa - 403 004, India
    • Dates

       
  • Journal of Earth System Science | News

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