Abstract: The objective of this study is to evaluate flood risk
area by integrating GIS and RADARSAT data. The study area,
Northeast Thailand, is subject to flood during the rainy season.
The main data used in this evaluation included RADARSAT
data, landform and topographic map. The evaluation was
conducted by overlay operation of flood area in 2001, land
form and buffer region beyond the flood areas with the
selection criteria defined. Most of the flood risk areas were
found in the low lying land form within the buffer region. The
cloud penetrating capabilities of SAR is only a source of
information for effectively assessment of flood risk area in
Northeast Thailand.