Validation of Landsat Thematic Mapper-derived phytoplankton pigments through synchronous surface measurements: area off Calicut to Azhikal in the Arabian Sea

摘要

This paper deals with an estimation of phytoplankton pigments from Landsat ThematicudMapper (Tivi) data after removal of atmospheric effect. The pigments derived from Landsat TIV1 dataudof October, 1986 and March, 1987 have been compared with corresponding surface values measuredudduring ship cruise programmes synchronous to satellite overpass. In-water algorithm for Landsat TMudbands was developed from the sea data collected off Quilon to Malpe In the Arabian sea at differentudperiods of the year. A uniform bias towards underestimation of pigments has been observed in theudcase of October data and an appropriate modification In the pigment algorithm for Landsat TM hasudbnen suggested.