General geology and land use development of Taragong area, Garut, Indonesia using remote sensing anaysis

The study area is located in Taragong area, Garut, Indonesia and has two different areas coverage. For the general geology, the area covers 25 km2 while for the specification part, specifically on the land use development the area covers 225 km2. The difference in the study area coverage is because Landsat has a low spatial resolution of 30 m. The change in land use can be understood with the aid of satellite imagery. In this research, two generations of Landsat namely Landsat 7 (ETM+) and Landsat 8 (OLI and TIRS) are used to acquire the satellite imageries for two different time periods that is 2005 and 2015 respectively. The research shows the land use dynamics of Taragong area of Garut District in West Java, Indonesia over a period of 10 years from 2005 to 2015. The objectives of this research are to update the geological map of Taragong area, Garut, Indonesia and to identify the land use development hence generating a land use map. Based on the updated geological map, basalt and andesite are two types of lithology found and can be divided into 11 rock units. In this study area, the elevation ranges between 700 m – 1 450 m and thus, is classified under mountainous area. Parallel, deranged, dendritic and rectangular are four types of drainage patterns found the study area. Faulting is also present as the geologic structure. Supervised classification technique of the Maximum Likelihood Classification (MLC) method in ENVI 5.1 is used to identify the five classes of land use. The results indicate the built up area, vegetation area and water body area have increased by 7.827% (17.646 km2), 20.468% (46.143 km2) and 21.816% (9.677 km2) respectively while agriculture area and barren area have decreased by -22.766% (51.206 km2) and -15.206% (34.281 km2) respectively.