River Discharge patterns in Taisha Bay, Shimane Prefecture were studied by remote sensing. Real color aereal photographs were taken at a normal condition and a flood condition both with simultaneous sea truth measurements. At the latter case, taken photographs were oblique, and they were digitally rectified and mosaicked to make one image which include the whole discharge pattern. After certain preprocessings of the images, the clarity and the water depth patterns of the normal condition and the turbidity pattern of the flood condition were extracted by regression analysis with the aid of sea truth data.