The Analysis for Spectral Reflectance Characteristics of Targets under Satellites and the Automatic Recognition of Cloud

A method for real-time automatic classification of targets and the automatic control of camera shutter are discussed. The physical model of computing the radiance is presented, the influences of atmosphere is considered and the spectral reflectance characteristics of five kinds of targets is analyzed. The radiance of 34 tar.gets at sorts of atmospheric conditions are computed with the model. The best wavebands, the classification functions and classification flow diagrams for five kinds of targets are determined. The problem of distinguishing cloud and non-cloud is studied. Ten Landsat MSS pictures are measured with the TD504 densimeter. The radiance distribution chart is similar to the result of calculation. How to realize the real-time automatic recognition of cloud on the satellite is also discussed.