On 29 – 30 January 2020, PT NewQuest Geotechnology personnel took up a remote sensing training by Ir. Suwijanto Tarmidi. He is an expert in geology and remote sensing technology for geothermal exploration in Indonesia with more than 30 years experiences. He was a prominent researcher of Indonesian Institute of Sciences (LIPI) specialized for geological imaging and remote sensing.
Remote Sensing is the acquisition of earth surface information about an object or phenomenon without physical contact, using satellite or airborne, utilizing Electromagnetic Waves (in the range of microwave, infrared, and visible wave). For example, the reflection of EM (electromagnetic) waves from sunlight is captured by sensor. Raw data obtained are then processed and interpretated visually. Remote sensing can be applied in various fields, such as geological mapping, geological hazard, and of course in geothermal exploration. Remote sensing can be a guide for identifying lineament as well as identifying geological features (surface manifestations, alterations, and folds).
“There are 2 types of remote sensing. First, passive system, recording a beam of light or spectral band sourced from the sun. Its examples are Landsat and SRTM. And the second is active system, using microwaves from artificial sources, satellite and airborne. Its examples are Radar and LiDAR”, Suwijanto explained on the training at PT NewQuest Geotechnology office in Depok, West Java.
Remote sensing is very useful in geothermal exploration. Data generated from remote sensing interpretation can be the initial guess and guide before conducting field visits. Furthermore, geological surveys in the field confirm and at the same time correct maps made based on remote sensing.