Flood Hazard Analysis in Greater Dhaka of Bangladesh Using Remote Sensing Data with Geographical Information System

Flooding is a regular feature in Dhaka during the monsoon. Dhaka has witnessed many disastrous floods of which the 1987, 1988, 1998 and 2004 ones are notable in recent flood history. The objectives of this paper are, firstly, to estimate flooding in Dhaka using Landsat TM and RADARSAT Synthetic Aperture Radar (SAR) data for three greatest events in 1988, 1998 and 2004, and secondly to assess flood hazard using remote sensing data with Geographical Information System (GIS). A threshold technique was employed to estimate flooding areas from the Landsat TM data while a rule based approach was used to delineate land-water boundaries in the SAR datasets. In order to accurately quantify the flooded area, the images taken during the flood…