IDENTIFICATION OF GEOTHERMAL ENVIRONMENTS BY USING LANDSAT IMAGERY AT PLTP SARULLA UNIT I, PAHAE JAE SUBDISTRICT, NORTH TAPANULI

Geothermal energy sources have a significant influence on renewable energy sources as an affordable and sustainable solution. The aim of this study was to identify geothermal sources at the Sarulla PLTP using remote sensing technology. The method of this study includes field surveys by obtaining hotspots and temperature values in geothermal sources, and identification of geothermal sources is determined by mapping of land use change (NDVI) and heat source distribution (LST). The results show vegetation area has been changed from 0,6 to 0,3, and the temperature value is increasing 25 °C to 28 °C in 2010 to 2018 over PLTP Sarulla. Negative correlation found between NDVI and LST. Surface changing over geothermal resources as an evidence of environment changes. The geothermal sources increase with the opening of land in the PLTP Sarulla. So the results of this study can be recommended to the public and the government.