Title:
|
Evaluation of ASTER Data Use in Land Use Study in the Mekong delta |
Author:
|
Pham, Van Cu; Einar, Lieng; Le, Thanh Hoa; Hiroshi, Watanabe; Hoang, Kim Huong
|
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. |
Description:
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VNU JOURNAL OF SCIENCE, Earth sciences, T.xxIII, N01, 2007 |
URI:
|
http://hdl.handle.net/123456789/175
|
Date:
|
2007 |