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Data Processing: Image Classification
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Mapping Bamboo Forest Expansion in the Suburb of
Fukuoka City Using Aster Data
Yuko FUKUI
Researcher, Earth Remote Sensing Data Analysis Center
Forefront Tower 14F, 3-12-1 Kachidoki, Chuo-ku, Tokyo, Japan, 104-0054
phone +81-3-3533-9310, fax +81-3-3533-9383,
Email: fukui@ersdac.or.jp
Tetsushi TACHIKAWA
Researcher, Earth Remote Sensing Data Analysis Center
Forefront Tower 14F, 3-12-1 Kachidoki, Chuo-ku, Tokyo, Japan, 104-0054
phone +81-3-3533-9310, fax +81-3-3533-9383,
Email: tatikawa@ersdac.or.jp
Yasuteru IMAI
Researcher, KOKUSAI KOGYO CO., LTD.
5 Sanbancho, Chiyoda-ku, Tokyo, Japan, 102-0075
phone +81- 3-3288-5812, fax +81-3 -3288-5662,
Email: yasuteru_imai@kkc.co.jp
Masahiro SETOJIMA
Chief Engineer, KOKUSAI KOGYO CO., LTD.
5 Sanbancho, Chiyoda-ku, Tokyo, Japan, 102-0075
phone +81- 3-3288-5812, fax +81-3 -3288-5662,
Email: masahiro_setojima@kkc.co.jp
ABSTRACT Wild bamboo forests have been expanded into Satoyama coppice forests, mainly
in western part of Japan. The uncontrolled expansion of bamboo forests is concerned of its
impact to ecology in Satoyama coppice forests and increased a risk of landslide. In order to
prevent the uncontrolled expansion, it is not sufficient to investigate a present distribution of
bamboo forests. The past distribution and future potential distribution are essential. This paper
demonstrated image classifications to extract the present and past distribution of bamboo forests
using ASTER and LANDSAT TM data respectively. The results showed that a Decision Tree
Classifier, whose thresholds were determined using ASTER band3 (near infrared) and band4
(short wavelength infrared), could estimate the forests at the accuracy of over 70%, provided
that the bamboo forest area is over 4,500 square meters. It was possible to estimate the
expansion between present and past at the accuracy of over 60%. Ultimately, a prediction map
of bamboo forest expansion was successfully generated based on the land conditions desirable
for the expansion.
1. INTORODUCTION
Wild bamboo forests have been expanded into Satoyama coppice forests mainly in western part
of Japan. Controlled bamboo plantation was originally conducted to cultivate bamboo shoot and
wood materials (construction, agriculture and fishery). Many bamboo forests, however, have
been abandoned due to decrease in the demand and wildly expanded into Satoyama coppice
forests. The uncontrolled expansion of bamboo forests is concerned of its impact to ecology in
Satoyama coppice forests and increased a risk of landslide. However, few researches have been
done over a wide range area so far. This study was carried out for the purpose of developing a
monitoring method to prevent the uncontrolled expansion of bamboo forests.
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