Problem to be solved: to provide a cloud observation system capable of properly specifying the location and altitude of clouds.Cloud observation device 11Positional positions are different from each otherAn all sky image G3 picked up by a plurality of whole sky cameras 10 arranged in P2Acquisition section 12 to acquireCloud distribution data B3 representing cloud distributionA cloud distribution data generator 13 for generating B4 for all sky images andCloud distribution data B3Expand or reduceEach cloud distribution data B3 located in the area AR1 of the object subject to the evaluation of the state of the known positional relationship is maintained.The scale decision unit 14 determines the most overlapping scale of cloud inEach cloud distribution data B3 enlarged or reduced based on scaleTarget cloud decision unit 15A for determining target cloud from cloud included in.Diagram
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