Use of Landsat 8 Satellite Imagery, DEM, and Gravity to Identify Geothermal Sources in Kamojang, Garut and Surrounding Areas a) Farhan Abdurrohman- b) Yuliana Susilowati - c) Aang Gunawan Sutyawan - d) Wawan Hendriawan - e) Yugo Kumoro - f) Ratih Dewanti - g) Muhamad Ananda Pahlevi - h) Ryandra Satya Dharmawan
a) Geological Engineering, Faculty of Engineering
Jenderal Soedirman University
Purbalingga, Indonesia
farhan.abdurrohman[at]mhs.unsoed.ac.id
b) Research Center for Climate and Atmospheric
National Research and Innovation Agency
Bandung, Indonesia
yuli006[at]brin.go.id
c) Research Center for Data and Information Sciences
National Research an Innovation Agency
Bandung, Indonesia
aang003[at]brin.go.id
d) Research Center for Data and Information Sciences
National Research an Innovation Agency
Bandung, Indonesia
wawa020[at]brin.go.id
e) Research Center for Geological Disaster
National Research an Innovation Agency
Bandung, Indonesia
yugo001[at]brin.go.id
f) Research Center for Remote Sensing
National Research and Innovation Agency
Bandung, Indonesia
rati001[at]brin.go.id
g) Petroleum Engineering, Faculty of Engineering
University of Jember
Jember, Indonesia
m.anandapahlevi[at]gmail.com
h) Petroleum Engineering, Faculty of Engineering
University of Jember
Jember, Indonesia
ryandrasatyadharmawan06[at]gmail.com
Abstract
As a country in the middle volcanic belt of the world, Indonesia has a geothermal potential of around 23,965 GW. This amount is enormous compared to the power plants that have been installed in several regions in Indonesia. In this study, we identified the characteristics of the Kamojang Region, which have been proven to have geothermal resources and have been produced for later these characteristics to be applied in other areas. The parameters that we use in identifying this geothermal feature are the Land Surface Temperature Map, the Normalized Difference Vegetation Index, Composite Bands 5, 6, 7 derived from Landsat 8 data, and the Bouguer Anomaly Map derived from gravity data. Based on this study, it can be concluded that areas with high geothermal potential has surface temperatures above 21.69 degrees Celsius, NDVI values above 0.319 (medium green), there are geological structures, geothermal manifestations and Bouguer Anomaly values less than 200. Areas with medium geothermal potential has surface temperatures between 20.27 - 21.68 degrees Celsius, NDVI values between 0.23 - 0.318 (low - medium green), there are geological structures, and Bouguer Anomaly values between 200 - 240. Areas with low geothermal energy has a surface temperature of less than 20.26 degrees Celsius, an NDVI value of less than 0.22 (low greenness), no geological structures or geothermal manifestations and a Bouguer anomaly value of more than 240. But it should also be remembered that the LST Map and NDVI has a high degree of ambiguity, especially in tropical areas like Indonesia.
Keywords: Geothermal- Land Surface Temperature- Normalized Difference Vegetation Index- Fracture- Bouguer Anomaly- Landsat-8- Power plant
