UTILIZATION OF HIMAWARI-8 AND SENTINEL-5P/TROPOMI SATELLITE FOR SPREAD VOLCANIC ASH DETECTION IN CLEAR SKY AND CLOUDY WEATHER CONDITION (CASE STUDY: SOPUTAN AND ANAK KRAKATAU 2018 MOUNTAIN ERUPTION)

• Main Author: Fitri Nuraini, Daniyah
• Format: Final Project
• Language: Indonesia
• Online Access: https://digilib.itb.ac.id/gdl/view/48656
• Institution: Institut Teknologi Bandung

Detection of volcanic ash distribution is needed for disaster mitigation processes such as the evacuation process of the surrounding population as an effort to reduce health problems caused by the presence of volcanic ash and to reduce the threat of aviation safety. Detection of volcanic ash distribution can be done using a remote sensing system, the Himawari-8 Satellite and Sentinel-5P/TROPOMI Satellite. So far the best method for detecting volcanic ash in clear sky and cloudy conditions is unknown. This research detected the distribution of volcanic ash using the RGB (Red, Green, Blue) and RSTash (Robust Satellite Technique) methods with the Himawari-8 satellite and the calculation of AAI (Aerosol Absorbing Index) and SO2 gas emissions using the Sentinel-5P/TROPOMI Satellite. The research was conducted on the eruption of Mount Soputan and Anak Krakatau in 2018 to see the ability of each method to detect volcanic ash in clear sky and cloudy weather conditions. Determination of clear sky and cloudy weather conditions is done by viewing TBB (Temperature Black Body) using channel 13 of the Himawari-8 Satellite. Analysis and verification of volcanic ash distribution patterns is carried out using wind direction and speed data reanalysis ERA-5 which were previously verified against observing wind direction and speed data from BMKG (Meteorology, Climatology, and Geophysical Agency). ERA-5 wind speed and direction data are needed to determine the suitability of the volcanic ash distribution of each method with the direction and wind speed at the time of the eruption spatially. In clear sky weather conditions, both the RGB and RSTash methods of the Himawari-8 Satellite and AAI and SO2 emissions the TROPOMI Satellite can detect volcanic ash well, shown by the suitability of volcanic ash distribution with the wind direction. In cloudy weather conditions, the RSTash method is able to detect the spread of volcanic ash at certain times. The RSTash method is more easily identified by the volcanic ash than the RGB method because the RGB method is difficult to determine the boundaries of volcanic and non-volcanic ash objects based on color.