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<p>Land geophysical products encompass various techniques and tools used to investigate the physical properties of the Earth and Earth's subsurface. Ocean Color Monitor3 (OCM3) sensor, onboard the EOS-06 (Oceansat-3) satellite, enables significant advancement in the monitoring and analysis of terrestrial geophysical properties with improved spectral, radiometric, and geometric performance over its predecessors (OCM1 and OCM2). This study focuses on the realization of vital land geophysical products derived from 13 spectral bands of OCM3 data. They are Land Surface Shortwave Broadband Albedo, Visible Albedo, Inland Water Bodies, and key Vegetation Indices such as the Normalized Difference Vegetation Index (NDVI), Vegetation Fraction (VF), and Enhanced Vegetation Index (EVI). These products act as valuable tools in monitoring of surface albedo dynamics, vigour of vegetation cover and sustainable water usage. Land surface broad band and visible albedos are estimated from the narrow band to broad band conversion method. Three spectral vegetation indices and water bodies are generated using spectral band ratios. This paper details the processing techniques to realize these geophysical products over India. OCM3 geophysical products are compared against contemporary MODIS and Sentinel3 OLCI products. Albedo products are in good agreement (90%) with MODIS albedo. In case of vegetation indices, an overall accuracy of around 95% is achieved, thereby demonstrating sensor's capability to deliver consistent and high quality geophysical information.</p>

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Realization of Land Geophysical Products (Short-Wave Broad Band Albedo, Visible Albedo, Inland Water Bodies and Vegetation Indices) from EOS-06 Ocean Color Monitor3 Sensor

  • 期刊论文

  • 发表日期：

    2025年10月22日

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  • V. Keerthi,
  • M. Suresh Kumar,
  • T. Radhika,
  • M. Manju Sarma,
  • Prakash Chauhan

摘要

Land geophysical products encompass various techniques and tools used to investigate the physical properties of the Earth and Earth's subsurface. Ocean Color Monitor3 (OCM3) sensor, onboard the EOS-06 (Oceansat-3) satellite, enables significant advancement in the monitoring and analysis of terrestrial geophysical properties with improved spectral, radiometric, and geometric performance over its predecessors (OCM1 and OCM2). This study focuses on the realization of vital land geophysical products derived from 13 spectral bands of OCM3 data. They are Land Surface Shortwave Broadband Albedo, Visible Albedo, Inland Water Bodies, and key Vegetation Indices such as the Normalized Difference Vegetation Index (NDVI), Vegetation Fraction (VF), and Enhanced Vegetation Index (EVI). These products act as valuable tools in monitoring of surface albedo dynamics, vigour of vegetation cover and sustainable water usage. Land surface broad band and visible albedos are estimated from the narrow band to broad band conversion method. Three spectral vegetation indices and water bodies are generated using spectral band ratios. This paper details the processing techniques to realize these geophysical products over India. OCM3 geophysical products are compared against contemporary MODIS and Sentinel3 OLCI products. Albedo products are in good agreement (90%) with MODIS albedo. In case of vegetation indices, an overall accuracy of around 95% is achieved, thereby demonstrating sensor's capability to deliver consistent and high quality geophysical information.