Abstract
Indonesia is an archipelago country that has a long coastline of approximately 99,093 km. Most of the areas are intensively exploited by human activities. The increased population and development activities in the coastal area of Tapanuli Tengah and Sibolga have caused degradation and conversion of forests that cause the density of vegetation change. This research was conducted by overlaying some spatial data of the year 2007 and 2017 to analyze the changes of vegetation density and NDVI (Normalized Difference Vegetation Index) values between 2007 and 2017. The research result showed that the largest area of vegetation density changes was the decreased of very dense class, which wass 62.48%. The largest area increased occurred in the dense class of 50.75%. This research is expected to provide information for considering the management of coastal areas in Tapanuli Tengah and Sibolga.
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