Surveillance of water quality by remote sensing technique can be pursued with advantage. An attempt has been made in this paper to obtain regional models of water quality of inland tanks and lakes. Stepwise multiple linear regression analysis between water quality parameters and several functions of Exotech radiometer band reflectance values, namely, bands alone, bands and their ratios, and, bands and their products are evaluated with respect to performance of the regression parameters. It is seen, that, the pairwise product of the reflectance in different bands is better correlated than the bands and their ratios. A possible explanation for this could be the higher order non-linear relation between the water quality parameters and the spectral bands.
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