Distinction between Poorly and Well-Drained Paddy Fields in Chiba Prefecture Using Landsat TM Data

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  • ランドサットTMデータを用いた千葉県水田の乾湿区分
  • ランドサット TM データ オ モチイタ チバケン スイデン ノ カンシツ クブン

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Abstract

1) The area of poorly drained paddy fields can be detected from Landsat TM data. The brightness of TM Band 5 for wet ground is lower than that of dry soil. A location which does not receive rain for the previous 30 d is suitable for distinguishing a poorly drained paddy field from a well-drained one. 2) Using the TM data, paddy fields in Chiba Prefecture were divided into three parts, i.e., poorly, moderately and well-drained fields. The distribution of these is similar to the soil map composed from the ground soil survey conducted in the 1970s. 3) Comparing to the previous soil map, the current area of poorly drained fields seems to be decreasing in Chiba Prefecture. This trend is remarkable inland.

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