Mapping of total suspended matter based on sentinel-2 data on the Hooghly River, India

This study aims to develop a regional algorithm for monitoring and retrieval of total suspended matter concentration (C_TSM) using insitu CTSM data, in-situ remote sensing reflectance (R_rs) data and Sentinel 2 MSI data on Hooghly River. The field measurements were carried for 20 stations using Satlantic Hyperspectral Ocean Colour Radiometer (HyperOCR) and water samples were also collected at a depth of 0.5m fromApril to May 2018. The concentration of total suspended matter varies from 132 to 540 mg L^-1. The calibration was done for 70% of the data between in-situ C_TSM and in-situ remote sensing reflectance and the remaining 30% of the data is used for in-situ validation. The in-situ validation result shows the band combination of B7/B2 has higher fitting. For satellite validation, Sentinel 2 Multispectral Instrument (MSI) satellite data applies to the in-situ validation models to the retrieval of CTSM, which also confirms the band ratio of B7/B2 gives a good correlation with R² =0.75. The study shows, the applicability of Sentinel 2 MSI data for retrieval of C_TSM in Hooghly River, Kolkata. The Sentinel 2 MSI B7/B2 is highly recommended for mapping a higher concentration of suspended matter in the study area, respectively.