Digital Photo Analysis of Fine Sky

Junko KAMBEa, Umpei NAGASHIMAb*, Takamitsu KOHZUMAc, Eiko NAKAYAMAd and Tomoo AOYAMAe

aFaculty of Media Communication, Edogawa University
474 Komaki, Nagareyama, Chiba 270-0198, Japan
bResearch Institute for Computational Science , National Institute of Advanced Industrial Science and Technology
1-1-1 Umezono, Tsukuba, Ibaraki 305-8568, Japan
cFaculty of Technology, Ibaraki University
2-1-1 Bunkyo, Mito, Ibaraki 310-8512, Japan
dFaculty of Human Life and Environmental Science, Showa Women's University
1-7 Taishido, Setagaya-ku, Tokyo 154-8533, Japan
eFaculty of Technology, Miyazaki University
1-1 Gakuenkibanadai Nishi, Miyazaki 889-2192, Japan

(Received: February 19, 2009; Accepted for publication: September 8, 2009)

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.
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.
A large amount of SPM was observed in tropopause by photos taken from an airplane flying near the equator.

Keywords: Digital photo analysis, Fine sky, Suspended particulate matter: SPM

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