Estimation of chlorophyll-a concentration from in situ spectral sigatures (remote sensing reflectance, Rrs and normalized water leaving radiance, Lwn) in Kuala Terengganu coastal waters

Abstract

The study of the apparent optical properties and its relationship with chlorophyll-a were conducted in coastal water of Kuala Terengganu. This study was carried-out in order to estimate the the chlorophyll concentration from in situ spectral signature (Rrs and water leaving radiance, Lwn) around Kuala Terengganu coastal waters. Twenty eight stations are visited. The ground sampling was conducted from 23 October 2007 until 27 October 2007. In this study, AOP radiometric parameter such as upwelling radiance, remote sensing reflectance and water leaving radiance have been measured during in situ. Highest concentration of chlorophyll-a was observed in the study area was 0.4741 mg/m 3 at station 28. The study found that chlorophyll-a can be estimated using the Rrs at 673nm wavelength through polynomial relationship with regression 0.7333 while study also revealed that chlorophyll-a can be estimated using the Lwn at 656nm wavelength through polynomial relationship with regression 0.6264.