TRANSFORMATION OF THE NORMALIZED DIFFERENCE CHLOROPHYLL INDEX TO RETRIEVE CHLOROPHYLL-A CONCENTRATIONS IN MANILA BAY

Abstract. Manila Bay is one of the most significant harbors in region, enabling commerce and trade between Philippines other countries. Its abundant natural resources have provided for generations its inhabitants driven socio-economic development centuries. Like water bodies adjacent to highly urbanized cities, increased organic nutrient loading from untreated domestic, industrial, agricultural wastes resulted further degradation quality. While frequent quality monitoring ideal, data traditional field sampling methods might not be sufficient assess spatial temporal variations Bay. Remote sensing fills need a full overview bay’s Sentinel-3 images were initially processed through Case 2 Regional CoastColour (C2RCC) model retrieve remote reflectance. The Normalized Difference Chlorophyll Index (NDCI) was computed modeled against C2RCC-derived chlorophyll-a estimates. From this, we able get general equation (TNDCI – transformed NDCI) concentrations two reflectance bands (Oa8 Oa11). TNDCI gave an R2 0.9 RMSE = 5.12 µg/L as compared C2RCC values, 0.85 2.44 with data.