THE DEVELOPMENT OF A VEGETATION MONITORING METHOD IN JAPANESE RIVERS USING SYNTHETIC APERTURE RADAR (SAR)
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- SASAKI Syota
- 山口大学 大学研究推進機構 先進科学・イノベーション研究センター
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- NAKAMURA Haruyoshi
- 山口大学 社会建設工学科
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- KANNO Ariyo
- 山口大学大学院 大学院創成科学研究科
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- IMAMURA Yoshiyuki
- 山口大学 大学研究推進機構 先進科学・イノベーション研究センター
Bibliographic Information
- Other Title
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- 合成開口レーダを用いた日本の中規模河川における植生モニタリング技術の開発
- ゴウセイ カイコウ レーダ オ モチイタ ニホン ノ チュウキボ カセン ニ オケル ショクセイ モニタリング ギジュツ ノ カイハツ
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Abstract
In this study, we propose a method to monitor vegetation in Japanese rivers using a synthetic aperture radar (SAR) satellite. The proposed method was applied to the Sabagawa River in Yamaguchi Prefecture, Japan. We compared a combined X and L band SAR image with a survey result obtained by drone aerial shooting. While we observed shadow areas behind a bamboo grove in the river on the line-of-sight of the satellite in the X band SAR image, any distinctive shadow area of the bamboo grove was not observed in the L band SAR image. Extracting shadow areas that appeared only in X band SAR image, we found that the extracted area were observed behind the bamboo grove area. Based on the observation principle of SAR satellite, we proposed an equation to estimate a bamboo height from a shadow area on a combined X and L band SAR image. The proposed equation reproduced the bamboo heights from the shadow areas on the SAR image accurately. The mean and standard deviation of relative errors were -15.6% and 17.0%, respectively.
Journal
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- Journal of Japan Society of Civil Engineers, Ser. G (Environmental Research)
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Journal of Japan Society of Civil Engineers, Ser. G (Environmental Research) 73 (5), I_303-I_308, 2017
Japan Society of Civil Engineers
