Remote Sensing and GIS Technology for Monitoring Bhola Island of Bangladesh

S M Mizanur Rahman, M Rahman Akhand, M Hashem Uddin



The Island of Bhola is one of the biggest island of Bay of Bengal (BoB), Bangladesh. The purpose of this study was to study how coastal transformations had influenced the people on the island of Bhola and vice versa. Three different methods have been used, field observations/mapping, use of GIS-applications and interviews. Integrated analysis of Remote Sensing (RS) and Geographic Information (GIS) can gives a vital input for management of natural resources, because RS observation with its unique capability provides cost-effective support about the environment of coastal area, while GIS facilitates uses for multidisciplinary analysis and decision support. In the field interviews have been made from the local people for verified the interpretation of previous images as well as current situation.

Near infra-red band of Landsat-MSS/TM have been used for separation of land and water classes. In this case a methodology has been developed by selecting Digital Number (DN) of near infra-red region of MSS and TM imageries. Coastal transformation maps have been produced using raster base GIS analysis. The result shows that about 10285 ha area of the eastern part of Bhola Island has been disappeared in the sea during 37 year (1973-2010). The variation in magnitude depends on the different grade of vegetation cover, beach slope gradient, soil compaction and the grade of influence by human beings. People living by the embankment have had to move between 2 to 4 times during a period of due to the erosion. Many of these people have been landless, and are now living illegal by the embankment in serfdom.

Keywords: Remote sensing, GIS, Landsat MSS/TM



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ISSN : 2251-1563