Remote sensing technique provides the possibility of rapid and synchronous monitoring in a large area of the water
quality, which is an important element for the aquatic ecosystem quality assessment of islands and coastal zones,
especially for the nearshore and tourism sea area. Tioman Island of Malaysia is regarded as one of ten of the best islands
in the world and attracts tourists from all over the world for its clear sea, beautiful seashore and charming scenery. In this
paper, on the basis of in situ dataset in the study area, distribution discipline of water quality parameters is analyzed to
find that phytoplankton pigment, rather than suspended sediment is the main water quality parameter in the study area;
seawater there is clean but not very oligotrophic; seawater spectra contains distinct features. Then water quality
hyperspectral retrieval models are developed based on in situ data to calculate the chlorophyll a concentration ([chl-a]),
transparency (SD) with satisfactory performance. It's suggested that model precision should be validated further using
more in-situ data.
The Bohai Sea is the inland water of China and surrounded by the land from 3 sides. In this paper in situ data of
chlorophyll a concentration [Chl-a], Normalized water leaving radiance Lwn(λ) and diffuse attenuation coefficient at
490nm for downwelling irradiance Kd(490) have been used to validate corresponding MODIS data products. It's found
that MODIS Lwn(λ) products of blue and green bands have mean Absolute Percentage Difference (APD) less than 15%,
among which Lwn(443) has the highest precision, with APD being 5.42%. In red band, MODIS Lwn(λ) performs worst
and MODIS Lwn(670) overestimates the observed value about 10 times. APD of MODIS Kd(490) is 80.69%. APD of
MODIS [Chl-a] is 88.31%, and almost all the MODIS [Chl-a] overestimate the measured values. It's concluded that
MODIS Lwn(λ) precision reflects the applicability of corresponding atmospheric correction algorithm in the Bohai Sea
and it's recommended that the MODIS atmospheric correction model applicable to the Bohai Sea be developed. The
major origin of MODIS Kd(490) and [Chl-a] error is that the inversion algorithms adopted by MODIS data processing
are not applicable to the Bohai Sea and corresponding inversion model should also be developed.
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