SIMULATION OF FIELD SPECTROMETER DATA FOR REMOTE SENSING MEASUREMENTS TO RETRIEVE CHOLOROPHYLL a IN CASE 2 WATER

Abstract

This paper describe about technique to retrieve chlorophyll a concentration by using field spectroradiometer data with fluorometer data and the Sea-viewing Wide Field-of-view Sensor (Sea WiFS) data. Spectroradiometer data were coupled with fluorometer data to find out the best suited bands ratio to monitor the chlorophyll a concentration for inland water. Remote sensing reflectance measurements were used to evaluate the performance of several default ocean color chlorophyll algorithms for Sea WiFS data. Using the default chlorophyll algorithms used in TeraScan System (OC2-V2) and SeaDAS (OC4-V4) as the basis of comparison; this study examined the validity of these empirical chlorophyll algorithms with in situ data. Remote sensing reflectance data from spectroradiometer and in situ chlorophyll a data from fluorometer were collected for Lake Abashiri, and SeaWiFS data for Lake Saroma were used. It is shown that the chlorophyll a concentration from fluorometer and reflectance from spectroradiometer lies in exploiting the signal provided by the chlorophyll a red absorption peak near 670nm. Two-band ratio based on a ratio of reflectance 670 and 700nm provided a good correlation for a linear model, compared with blue-green two band ratio.