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Performance evaluation of Normalized Difference Chlorophyll Index in northern Gulf of Mexico estuaries using the Hyperspectral Imager for the Coastal Ocean
Citation:
Mishra, D., B. Schaeffer, AND D. Keith. Performance evaluation of Normalized Difference Chlorophyll Index in northern Gulf of Mexico estuaries using the Hyperspectral Imager for the Coastal Ocean. GIScience and Remote Sensing. Taylor & Francis Group, London, Uk, 51(2):175-198, (2014).
Impact/Purpose:
The Hyperspectral Imager for the Coastal Ocean (HICO) was used to derive chlorophyll-a (chl-a) based on the Normalized Difference Chlorophyll Index (NDCI) in two Gulf of Mexico coastal estuaries. NDCI could be effectively used as a qualitative chl-a monitoring tool with a reduced need for site-specific calibration.
Description:
The Hyperspectral Imager for the Coastal Ocean (HICO) was used to derive chlorophyll-a (chl-a) based on the Normalized Difference Chlorophyll Index (NDCI) in two Gulf of Mexico coastal estuaries. Chl-a data were acquired from discrete in-situ water sample analysis and above-water HyperSAS remote sensing reflectance in Pensacola Bay (PB) and Choctawhatchee Bay (CB). NDCI algorithm calibrations and validations were completed on HICO data. Linear and a best-fit (polynomial) calibration performed strongly with R2 of 0.90 and 0.96 respectively. The best validation of NDCI resulted with an R2 of 0.74 and RMSE of 1.64 ug/L. A strong spatial correspondence was observed between NDCI and chl-a, with higher NDCI associated with higher chl-a and those areas were primarily located in the northern PB and eastern CB at the river mouths. NDCI could be effectively used as a qualitative chl-a monitoring tool with a reduced need for site-specific calibration.
