Integration of Remote Sensing and GIS Technology for detecting Erosion and Accretion of Sandwip Island, Bangladesh

M H Uddin, M H Sarker, A Mohammad, S B Saha, S Chakma



Natural resources of off shore island of Bay of Bengal (BoB) have been used for multiple purposes and have strongly influenced socio-economic development. Conventional methods of collecting information about coastal area are relatively costly, time consuming and inaccurate. On the other hand Remote Sensing (RS) observation with its unique capability provides cost-effective support in compiling the latest information about the environment of coastal area, while Geographic Information System (GIS) facilitates uses for multidisciplinary analysis and decision support. Integrated analysis of RS and GIS can gives a vital input for better planning for exploration, exploitation, conservation and management of resources. In this study Sandwip Island of the BoB has been selected as study area.

Landsat MSS (80 m) data of 1973, Landsat TM (30 m) data of 1989 and 2010 were used to generate digital data base of different time period, analysis of erosion and accretion and finally produced digital map of Sandwip island of Bangladesh in different time period.

For land water layer generation, near-infrared band of (0.76 to 0.90 μm) has been used to develop an algorithm. In this study DN values of water in band 4 of Landsat-TM have been collected carefully from the histogram of the selected images and applied in the developed algorithm. Erosion and accretion map has been produced using raster base GIS and ArcGIS analysis. The study reveals that about 7068 ha area has been disappeared in the sea during 37 year (1973-2010) of which during 1973 to 1989 the rate of erosion per year was about 316 ha but during 1989 to 2010 it was reduced to 24 ha only.

Keywords: Conventional, Remote sensing, GIS, Erosion, Accretion



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ISSN : 2251-1563