Mangrove forests are confined by river basins and play a role as a hotspot of biodiversity while acting to prevent erosion in the river-coastal system. However, mangroves are changing rapidly at present, driven by urbanization and land use land cover transformation. Similar to other types of vegetation, the mangrove has a unique spectral characteristic that can be distinguished by remote sensing technology. Vegetation indices has been utilized for mangrove change detection and SPOT imagery provide the right spectral and spatial resolution in achieving it. The present study aimed to examine the changes of vegetation index density classes of primary mangrove areas between the year 2009 and 2019 in Sungai Sepang Besar, Sepang Malaysia. The process includes image acquisition, accuracy assessment, ground truthing, and NDVI density analysis. The results show changes in density, types and total areas of mangroves that relate to rapid urbanization and substantial land use transformation of the surrounding areas for the past 25 years.

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