- About one hundred images of the southeastern Mediterranean coastal waters, which were produced by the NIMBUS-7 CZCS, have been used to study the circulation pattern of the region. This paper is aimed (1) to adapt and calibrate an optical model for determining suspended sediment concentrations for the study area; and (2) to demonstrate the application of an interpolation technique for creating a continuous spectrum from a small number of multispectral image channels. The study area is characterized by relatively high suspended sediments and very low chlorophyll concentrations. The optical model which was found to be suitable for estimating suspended sediment concentrations (Csm) from the CZCS data has the form of Csm = 1.4+1.6([Lu (550)-Lu(670)]1.7|[Lu(440)|Lu(550)]), where Lu is the upwelling radiance for the various wavelengths. This model meets the fundamental requirements of low sensitivity to both chlorophyll and atmospheric variation remaining after correction. A method of estimating the continuous spectrum, based on a small number of multispectral image channels, along a transect crossing a front of optical density variation was developed. The spectral features of the water reflectance were analyzed. Results show that this method enables one to determine, with adequate sensitivity, the parameters of water quality of the region.