Stand Parameter Estimation of Artificial Evergreen Conifer Forests Using Airborne Images : An Evaluation of Seasonal Difference on Accuracy and Best Wavelength
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概要
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The relationship between the stand parameters (top layer height (H1) and volume/ha (Vha)) and digital number (DN) were evaluatedfor evergreen conifer stands using three airborne images with 4-m spatial resolution, which were taken in June 1995, September 1993,and October 1994 using the Compact Airborne Spectrographic Imager (CASI). Estimation accuracy of the stand parameters, theirseasonal changes, and suitable wavelength were analyzed using correlation coefficients and a regression analysis. The minimum DNof stands, which showed the darkness of a canopy shadow, had a higher correlation with H1 than the average and maximum DN whilethe average DN had a higher correlation with Vha. The green channels gave the highest correlation coefficients with H1 and Vha,which exceeded - 0.9 for the September and October images. However, the red channels had a consistently high correlation withthe stand parameters for the three images. The near infrared channels gave poor correlations with H1 and Vha for the June image.Spectral variations among trees may affect the relationship between DN and the stand parameters in the leaf maturation period inJune. Consequently, the late growing season was better at giving consistent results for the stand parameter studies. There was a linear relationship between the measured and the estimated stand parameters for the validation plots especially for the H1 case of September with sufficient accuracy. Nadir viewing images. which had high spatial resolution and a wide dynamic range such as the CASIimages, were necessary to estimate the stand parameters accurately.
- 一般社団法人日本森林学会の論文
- 2000-11-16
著者
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Takao Gen
Hokkaido Research Center Forestry And Forest Products Research Institute
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Tanaka Nobuhiko
Forestry And Forest Products Research Institute
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Tanaka K
Frontier Res. System For Global Change Yokohama Jpn
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KODANI Eiji
Shikoku Research Center, Forestry and Forest Product Research Institute
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Awaya Yoshio
Tohoku Research Center, Forestry and Forest Products Research Institute
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Tanaka Kunihiro
Tohoku Research Center, Forestry and Forest Products Research Institute
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Tsuyuki Satoshi
Graduate School of Agricultural and Life Sciences, The University of Tokyo
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Awaya Yoshio
Tohoku Research Center Forestry And Forest Products Research Institute
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Tsuyuki Satoshi
Graduate School Of Agricultural And Life Sciences The University Of Tokyo
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Kodani Eiji
Shikoku Research Center Forestry And Forest Products Research Instutute
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Kodani Eiji
Shikoku Research Center Forestry And Forest Product Research Institute
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Tanaka Nobuhiko
Forest Management Division Forestry And Forest Products Research Institute
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- Reviewer Acknowledgements
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