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《Journal of Sediment Research》 1982-03
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Simulation Study on the Remote Sensing of Suspended Silt Content in Water Body

Shu Shourong Chen Jian (Institute of Karst Geology of The Ministry of Geology)  
Attempt to solve the key problem in remote sensing of suspended silt content in water body has been made through ground simulation. Within the spectral range from 0.38-1.10 micrometer, the spectral reflectance characteristics of water bodies containing different suspended silt contents were measured, which brought to light the relationship between spectral reflectance characteristics and silt content in water body. Curve fit method was used to obtain the optimum fit function (i. e., the optimum regression equation ) relationship of the silt content in water body to spectral reflectance at characteristic wavelengths and mean spectral reflectance in LANDSAT bands respectively. The results show that the function of the optimum regression equation varies with LANDSAT bands. The regression analysis indicates that the optimum band for remote sensing of suspended silt content in water body is band 5 of either ERTS or LANDSAT-D, and the optimum wavelength would be 0.6 micrometer. In addition, the effects of regression equations with different goodness of fit on the selection of the optimum band and the detection accuracy for silt content are also studied. The calculation has proved that the regression equations with non-optimum goodness of fit will not only lead to wrong selection of the optimum band, but cause a serious drop in detection accuracy of the silt content as well . The simulation research work described in this paper has provided a basis for practical airborne and satellite remote sensing of suspended silt content in water body. Moreover, a new idea of detecting the suspended silt content of surface water remotely on the ground by means of spectroradiometer is put forward on the basis of our simulation experiments.
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