Spatio-temporal NDVI changes of mangrove forest in West Bangkalan using high resolution imagery

Department of Marine Sciences, Faculty of Agriculture, Universitas Trunojoyo Madura, Bangkalan, Indonesia

^* Corresponding author: herlambang.rachman@trunojoyo.ac.id

Abstract

Mangrove play a crucial role in coastal ecosystem, both ecologically and economically. The phenomenon of land use change in coastal areas is a serious issue, especially for mangrove ecosystems. Currently there is one of the data with the High Resolution Imagery category that can be used as an analysis of coastal areas. High resolution data can provide detailed information on changes in coastal areas. The case study conducted in this analysis is on the west coast of Bangkalan Regency, precisely in Arosbaya District. The assessment carried out in this study is the analysis of temporal variations in the Normalize Different Vegetation Index (NDVI) value in mangrove forest areas using High Resolution satellite imagery. The data used is PlanetScope image with 3 m spatial resolution with 4 spectral bands from 2018-2023. The results of the analysis show that the average value of NDVI in the study area is 0.66 with a quite high value distribution in the western and eastern parts. The temporal standard deviation value of NDVI shows that some locations have high values, reaching 0.5 in some locations. Analysis of the trend of change shows that locations with high standard deviation values have a tendency to have increasing trend values in the north (>0.2 per year) and there is also a decreasing trend in the south (<-0.2 per year). After identification, areas with increasing (positive) NDVI trends are areas that have experienced mangrove rehabilitation in recent years. While in areas with a downward trend there is a change in land use that was previously a mangrove forest area into ponds.