衛星画像でみる京阪奈丘陵の開発  [in Japanese] Identification of the Development of Suburban New towns Using Satellite Images: A Case Study of the Keihanna District in the Kansai Metropolitan Area, Japan  [in Japanese]

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Abstract

<p>本稿では,現代日本の大都市圏周辺部における都市化の物理的実態を明らかにするために,多時点の衛星画像を利用する試みを紹介する.対象地域として大阪大都市圏の周辺に位置する京阪奈丘陵地域を取り上げ, 1978 年,1989 年,2000 年の3時点のLANDSAT 画像データを利用した.まず植生の変化を明らかにするために,正規化差分植生指標(NDVI)の分布を検討した.次に3時点の赤色バンド画像を青・緑・赤の3つのチャンネルに充てて合成カラー画像とし,京阪奈丘陵における段階的な都市化過程を物理的側面から可視化して示した.さらに人口増減データと比較しつつ,色で強調された各時点における宅地造成が,日本住宅公団(現都市再生機構)や民間業者・学校法人による開発行為であることを確認した.結論として,多時点衛星画像の利用が都市圏レベルでの包括的な土地利用/被覆変化を明らかにする有効なデータソースとなりうることを立証した.</p>

<p>In this paper, we used multi-temporal satellite images to highlight the land development for creating suburban new towns near Osaka metropolitan area in the recent decades. The study area called Keihanna which is hilly in topography and was once covered by forests, is located within the triangle cornered by Osaka, Kyoto and Nara. The images we used are of LANDSAT data acquired on April 14, 1978 (MSS), May 31, 1989 (TM) and August 25, 2000</p><p>(ETM+). The topographical background of the study area is shown in Figure 1, which shows geomorphologic (DEM) model draped by true color image of LANDSAT of 1989. The change in the land cover between 1978 and 2000 is highlighted in Figure 4, which is composed by overlaying images of the three years. The visible red band images of 1978, 1989 and 2000 are assigned to blue, green and red channels to create the composite color picture. Since forests look dark in the images of visible red band while bare lands under construction look bright, we can suppose that the changes in tone on the image reflect land cover changes. Therefore, we can guess that areas highlighted in green are newly developed sites in 1989 while areas highlighted in red are newly developed sites in 2000.</p><p>In this case, large scale developments are performed by destroying forests covering hilly areas to create new residential growth. Therefore, the change in the land cover (Figure 5) is similar to the pattern of population growth</p><p>(Figure 6) in the Keihanna district. The main residential areas are located to the north of Nara city and Ikoma city.</p><p>We presented spatio-temporal visualization of the land cover change which occurred in the periphery of the Osaka metropolitan area. It might be interesting to examine the relationships between occurrence of large scale developments and quantitative geomorphologic indices such as relief energy or gradient. Because of the defects of the DEM used, we cannot implement that examination. We can conclude that multi-temporal satellite images provide us with useful insights into the physical aspects of changes caused by metropolitan urbanization.</p>

Journal

  • Urban Geography

    Urban Geography 4(0), 20-27, 2009

    The Japanese society of Urban Geography

Codes

  • NII Article ID (NAID)
    130007829861
  • Text Lang
    JPN
  • ISSN
    1880-9499
  • NDL Article ID
    10293285
  • NDL Source Classification
    ZG1(歴史・地理)
  • NDL Call No.
    Z71-R125
  • Data Source
    NDL  J-STAGE 
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