Võ Quang Minh, Tô Phúc Tường, S.P. Kam, A. Alvaran, N. Fabellar (trang 128-134, 101)
Từ khoá: ảnh viễn thám, ảnh viễn thám radar, lũ, Đồng bằng sông Cửu Long
Radar remote sensing imageries – a mean for monitoring flood succession in the Mekong delta
For each aquisition date, 2 adjacent scenes along the same track were available. The images were calibrated, geo-rectified and mosaicked. Radar backscatter values associated with flooded land were determined, and density slicing carried out to delineate flooded areas. The multi-date classified images were combined to produce a map showing the progression and retreat of flood waters due to excessive upstream discharge of the Mekong river. Field surveys carried out to determine the rice cropping calendar in the flooded-affected areas show that farmers have generally adapted the timing of their rice crops to avoid the floods.