Digital Photo Analysis of Fine Sky

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  • KAMBE Junko
    Faculty of Media Communication, Edogawa University
  • NAGASHIMA Umpei
    Research Institute for Computational Science , National Institute of Advanced Industrial Science and Technology
  • KOHZUMA Takamitsu
    Faculty of Technology, Ibaraki University
  • NAKAYAMA Eiko
    Faculty of Human Life and Environmental Science, Showa Women's University
  • AOYAMA Tomoo
    Faculty of Technology, Miyazaki University

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Other Title
  • 晴天のデジタル画像解析
  • セイテン ノ デジタル ガゾウ カイセキ

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Abstract

A method of computer image measurement using digital camera was developed and applied to observe Suspended Particulate Matter: SPM in open-air close to human life. Photos taken by digital camera is very useful to apply many measurements because of their high photographic sensitivity. In this paper we tried to get a character of photos of fine skies. Using digital cameras, we took photos at Miyazaki in the south of the Kyushu island, Mito, Tsuchiura, Tsukuba, and Sangenjaya in the east of the Kanto plain, Utsukushigahara heights where is located in the middle of Nagano, Japan, and Sydney, Australia. Photos were also taken from an airplane flying over the Great Barrier Reef, Australia, to observe air condition in tropopause.<BR>Ratio of Blue and Red (B/R) in digital photos is useful to a marker of purity of air in day time. B/R of fine sky is larger than 2.0. And ratios of green and red (G/R), and blue and green (B/R) of fine sky are larger than 1.5.<BR>A large amount of SPM was observed in tropopause by photos taken from an airplane flying near the equator.

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