建立了识别晴天、昙天、阴天三种天气类型的模式；
Three weather patterns on clear days, days covered with clouds and cloudy days are proposed.
碧空、昙天、阴天中，可见光与近红外通道的反射率，均是以阴天为最大；
Among clear air, cloudy sky and overcast sky, the maximum of reflective ratio within visible and near infrared tunnels appears in overcast sky.
碧空、昙天、阴天中，可见光与近红外通道的反射率，均是以阴天为最大；
Among clear air, cloudy sky and overcast sky, the maximum of reflective ratio within visible and near infrared tunnels appears in overcast sky.
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