TAILIEUCHUNG - Báo cáo " Evaluation of ASTER Data Use in Land Use Study in the Mekong delta "

Centre for Applied Research in Remote Sensing and GIS, College of Science, VNU 2 Norwegian Mapping Authority, Norway. 3 University of Social and Human Sciences of Ho Chi Minh City 4 Earth Remote Sensing Data Analysis Centre, Tokyo, Japan. 5 VTGEO, Institute of Geology, Vietnam Academy of Science and Technology ABSTRACT. The Mekong Delta in the south of Vietnam is a highly dynamic landscape with rapid changes in land use. Costal forests of mangrove (Rhizophoraceae, Sonneratiaceae and Avicenniaceae) and the more inland Melaleuca forests are changed into shrimp ponds and rice fields. The complex crop calendar and the diversification of. | vnu journal of science earth sciences n0i 2007 evaluation of aster data use in land use study in the Mekong delta Pham Van Cu1 Einar Lieng2 Le Thanh Hoa3 Hiroshi Watanabe4 Hoang Kim Huong5 1 Centre for Applied Research in Remote Sensing and GIS College of Science VNU 2Norwegian Mapping Authority Norway. 3 University of Social and Human Sciences of Ho Chi Minh City 4 Earth Remote Sensing Data Analysis Centre Tokyo Japan. 5 VTGEO Institute of Geology Vietnam Academy of Science and Technology abstract. The Mekong Delta in the south of Vietnam is a highly dynamic landscape with rapid changes in land use. Costal forests of mangrove Rhizophoraceae Sonneratiaceae and Avicenniaceae and the more inland Melaleuca forests are changed into shrimp ponds and rice fields. The complex crop calendar and the diversification of land use types strongly influenced by the agriculture product market create a very complicated land use practice in the Mekong Delta. This increases costal erosion and gives a local rise in temperature. Human activities also increase the risk of forest fires and corridors are therefore made to protect the remaining forests. Monitoring these changes accurately with a low cost is essential. Existing maps are inaccurate and not updated. ASTER data have a high spatial and radiometric resolution and can be acquired at a low cost. We seek a methodology to optimize differentiation between rice grassland and forest forest types soil types and rice growth stages. Characteristics of each band band combinations and band ratios are examined. Thermal channels are also used in these combinations to monitor human activities. 1. Introduction Ca Mau Province in the Mekong Delta has experienced a tremendous change in land use in the last ten years. Forests and agricultural land have been transformed into shrimp farms. This has been a trend in several South-East Asian countries in the late 80 s and early 90 s and it happened in Vietnam in the 90 s. Environmental costs .

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