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Abstract Yang, Z. and M. Reiter. 2008. Estimating chlorophyll a concentrations in coastal St. Jones River watershed using AISA images. JEMREST 4:88-101. DOI: 10.4029/4008jemrest4no107 Numerous studies indicate that biological and chemical water quality parameters such as chlorophyll a have distinctive spectral characteristics and can thus be measured using spectral indices, but the indices appear to be less reliable in turbid and colored-water systems such as are commonly found in many coastal regions. In this study, an Airborne Imaging Spectroradiometer for Applications (AISA) hyperspectral sensor was used to collect remote sensing data for lakes and rivers in the coastal St. Jones River watershed, DE in July 2004, while independent in situ water samples were collected concurrently and analyzed. The relationship between NIR/Red spectral indices and chlorophyll a concentrations in coastal waters was examined to test the performance of NIR/Red models for retrieving chlorophyll a concentrations in turbid Delaware coastal waters. There were significant relationships between chlorophyll a concentrations and some NIR/Red spectral indices, suggesting that chlorophyll a concentrations could be estimated in this coastal system using AISA images.

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