ASSESSMENT OF VEGETATION HEALTH IN SAINT MARTINS ISLAND, BANGLADESH USING REMOTE SENSING & GIS
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Abstract
Saint Martin’s Island, Bangladesh has been one of the most popular tourist destinations in the country with rapid growth in this industry. It is also a very sensitive ecosystem that is being negatively affected by the increased number of human settlements on the island. This island is situated in one of the most cycloneprone areas in this country. Increased consumption of resources along with consistent disasters has an impact on the health of vegetation on this island. This study assesses and visualizes the changes in vegetation health on this island from 2005 to 2019 spanning over 15 years using Remote Sensing (RS) and Geographic Information System (GIS). All of the data used in this study were collected from the United States Geological Survey’s (USGS) Landsat-7 Enhanced Thematic Mapper Plus (ETM+). All the satellite raster images used were geometrically and radiometrically corrected. The gap or no data issue with Landsat7 imagery was also corrected. The normalized difference vegetation index (NDVI) was then calculated for each of the years and the raster subtraction of 2005 from 2019 visualizes the differences. All these results are presented in classified categories. The results indicated that vegetation health has been changing over a large area during this period.
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