リモートセンシングによるメコン川・チャオプラヤデルタの土地被覆解析(<特集>海外地形調査におけるGIS/RSの活用)

概要

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Land cover and agricultural use in the Mekong and Chao Phraya basin in Southeast Asia are analyzed by remote sensing. The Mekong River flows through six countries and the amount of its water flow changes significantly between dry and rainy seasons. In order to attain a sustainable land use and water use of the Mekong River basin, land cover conditions in a wide area should be grasped. We made an agricultural pattern map using seasonal MODIS composite data sets. We classified agricultural areas into five categories: 1) rain-season cropping, 2) dry season cropping, 3) two-season cropping, 4) multi-season cropping, and 5) bare land. The Chao Phraya River flows through the center of Thailand. The Chao Phraya Delta located along the lower Chao Phraya River is one of the greatest rice granaries in the Asian monsoon area. In order to analyze land use conditions in the Upper East Bank of the Chao Phraya Delta (UEB), the remote sensing analysis was conducted using LANDSAT/ETM+ and LANDSAT/TM data. We classified paddy fields in the UEB into five categories: 1) land preparation/planting, 2) harvested, 3) nearly harvested, 4) growing in shallow water, and 5) growing in deep water (floating rice). Remote sensing technology has a good advantage to make land use maps and agricultural pattern maps in wide area in Southeast Asia.
2006-04-25