ANALYSYS OF COASTLINE CHANGES IN GILI MATRA USING GOOGLE EARTH ENGINE MACHINE LEARNING

Abstract

Coastline changes are natural phenomena that can significantly affect coastal areas. This occurs in Gili Matra which includes Gili Meno, Gili Air, and Gili Trawangan in North Lombok Regency, West Nusa Tenggara, which is a strategic area facing pressure due to climate change, plantation land, non-cultivated vegetation land, and open land turning into tourism facilities and infrastructure. Coastline changes in this area can damage coastal ecosystems, threaten tourism infrastructure, and disrupt the socio-economic activities of the local community. The purpose of this study was to determine the changes in the coastline in Gili Matra in the last 10 years. The method used in this study is a combination of quantitative and qualitative methods. The data processing process using the Google Earth Engine application includes selecting Landsat 8 image data, classifying built-up land, vegetation and artificial ponds or lakes. For the analysis of Coastline Changes using the ArcGIS application with the results of the analysis of changes in land use in 10 years, namely Gili Trawangan 112 ha to 161 ha with a rate of 45% of the area, Gili Air from 65 ha to 90 ha, Gili Meno there was a decrease in the area of ​​built-up land from 90 ha to 66 ha. Coastline changes occur in the Gili Matra area, both abrasion and accretion and there is a correlation between coastline changes and abrasion in the Gili Air area of ​​0.016 <0.05.