Estimation of Relative Illuminance in Forests using Hemispherical Photographs
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概要
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We compared sky factor, which is used in the field of architecture, and openness grade with measured relative illuminance. Sky factor and openness grade were measured on hemispherical photographs taken with an equidistant formula fisheye lens. The measurements were conducted under uniformly overcast skies at 20 points in a hinoki (Chamaecyparis obtusa) stand. Sky factor corresponded well with relative illuminance and the errors were ranged from -0.96 to 0.98 (%). By contrast, openness grade was lower than relative illuminance, and the regression coefficient between them was 0.62. The difference between sky factor and openness grade was due to the effect of the projection formula of the fisheye lens. In conclusion, sky factor was a better estimator of relative illuminance than openness grade. Furthermore, it was shown that it is important to state clearly the kind of fisheye lens used when measuring sky factor or openness grade.
- 森林計画学会の論文
著者
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Imada Morio
Faculty Of Agriculture Kyushu University
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Imada Morio
Department Of Forestry Faculty Of Agriculture Kyushu University
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Inoue Akio
Faculty Of Agriculture Tottori University
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Mizoue Nobuya
Kyushu Univ. Fukuoka Jpn
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Mizoue N
Kyushu Univ. Fukuoka Jpn
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Mizoue Nobuya
Department Of Forest And Forest Products Sciences Kyushu University
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Mizoue Nobuya
Laboratory Of Forest Planning Kyushu University
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Mizoue Nobuya
Department Of Forest And Forest Products Sciences Faculty Of Agriculture Kyushu University
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Teraoka Yukio
The University Forest In Miyazaki Faculty Of Agriculture Kyushu University:(present)department Of Fo
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Mizoue Nobuya
Faculty Of Agriculture Kyushu University
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OKAMURA Atsunori
Faculty of Agriculture, Kyushu University
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TERAOKA Yukio
The Kyushu University Forest in Miyazaki
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Okamura Atsunori
Faculty Of Agriculture Kyushu University:(present Office)japanese Forest Agency
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