| Abstrak/Abstract |
Traditional remote mapping for hydrothermally altered ground, a crucial part of geothermal exploration, becomes problematic in densely vegetated areas because of the limited ground view due to the thick canopy. Therefore, it needs datasets and techniques that can overcome the problems of limited spatial resolution. Light Detection and Ranging (LiDAR), active remote sensing, can be an alternative source of ground information as it produces high spatial resolution data from point-based scanning. LiDAR return intensity (LRI), a strength value of reflected energy to the sensor, contain collective information, e.g. ground reflectivity, the distance between sensor and target, the incident angle at target, and laser power. Although correction might be needed to refine the value representing ground reflectance, the LRI value can be a proxy for rock detection. Here, we investigate if the alteration (i.e. alteration degree) can be recognisedfromtheirLRIvaluesinlaboratorysettingusingaterrestrial laser scanner (TLS) at 1550 nm. This preliminary study is our base for mapping alteration from an airborne platform. |
