3. Methodology
The process of determining flood risk area in the
Northeast is based on flood event in 2001 and land form
of the areas. The flood event in 2001 can be performed
using RADARSAT data. The RADARSAT data used in
this study were acquired during the flood events
(September 2001) shown in table 1. Preprocessing of the
SAR data includes geometric correction, enhancement
and mosaicing. The images were produced and used for
visual interpretation. Land form map layer was prepared
from Landsat data, topographic map and field
experiences.