天空光の色温度に基づく雲量の測定方法の開発 : 雲量の自動測定装置の開発に関する研究 その2

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タイトル別名
  • EVELOPMENT OF A MEASURING METHOD OF CLOUD AMOUNT ON THE BASIS OF COLOR TEMPERATURE OF SKY LIGHT : Development of an automatic measuring instrument of c]oud amount Part 2
  • テンクウ ヒカリ ノ イロ オンド ニ モトズク ウンリョウ ノ ソクテイ ホ

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The purpose of this study is to develop an automatic measuring instrument of cloud amount. Color temperature of sky light is utilized as a parameter to distinguish clouds from the blue sky. Measurements of color temperature of sky light were made under various sky conditions. Discrimination criteria were obtained as functions of each of the solar altitude, altitude of the sky element, and angular distance between a sky element and the sun. The estimated c loud amount agreed well with the observed cloud amount. This paper describes derivation of the discrimination criteria from the measurements and estimation of cloud amount.

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