Detecting thermal anomalies in lahendong geothermal prospect using ASTER TIR and Landsat 8.

In this study, we set out to find unusual patterns in specific areas using data from Landsat 8 and ASTER satellites, including Thermal Infrared Sensor (TIRS) data. We used various techniques like georeferencing, radiometric calibration, and atmospheric correction to examine land surface temperatures (LST) during the day and night. We focused on four types of natural land cover: water bodies, vegetation, built-up areas, and barren land. Interestingly, we noticed that water bodies had cooler temperatures during the day but got warmer at night, while vegetation was cooler at night and warmer during the day. To accurately spot areas with higher temperature anomalies, while filtering out colder spots due to sunlight, we overlaid daytime and nighttime LST data based on land cover types. Additionally, we used thematic maps from satellite images to pinpoint village areas. To doublecheck the anomalies we observed, we compared our findings with geological maps. Through this approach, we successfully identified nine distinct regions where temperatures were 3 to 6 degrees Kelvin higher than the normal background temperature. [ABSTRACT FROM AUTHOR]