5:15 PM - 6:45 PM
[SVC26-P13] Thermal infrared observation using UAV at Izu Oshima 3
Keywords:UAV, Thermal Infrared observation, Izu-Oshima
In active volcano areas, understanding the state of thermal activity is one of the most important observation items for understanding the status of volcanic activity. The Izu-Oshima volcano has been reported to erupt every 36-38 years of 107 ton order by studies of eruption histories (Nakamura, 1964 and Endo et al., 1988), and more than 30 years have already passed since the last eruptive activity (1986-1990). Just before the last eruption, the ground deformation was stagnant for several years (Watanabe, 1988), and some precursor phenomena related to heat and volcanic gases were detected (Kagiyama and tsuji, 1987, hirabayashi et al., 1988). For this reason, we have been working on airborne thermal infrared observations using UAVs in the "Research on Monitoring and Forecasting of Volcanic Activities" of the current five-year plan (FY2019-2023). In this presentation, we will report the results of our research conducted in FY2023 on Izu Oshima Island.
The UAVs and thermal camera used for the observations were DJI Matrice 300RTK and DJI Zenmuse XT2 and all UAV flight operations and photography were outsourced to a contractor. In FY2023, based on the knowledge gained from previous observations, we planned to create an orthorectifed mosaic image of an area of about 1,700 m2, including the summit crater of Mt. Mihara, with a ground resolution of about 30 cm/pixel by setting both the direction of travel and the lap rate between courses to 90%. To collect these data in one night, two drones with separate take-off and landing positions were used to simultaneously observe two areas, one in the north and the other in the south. Due to expected individual differences in the thermal cameras mounted on each drone, known temperature observations were also made at several altitudes to ensure the accuracy of the temperature observations. Furthemore, During the drone flights, portable meteorological instruments were mounted to measure air temperature and humidity at the altitude of the drone, and observations were made using the RTK function.
Actual observations were conducted in early February 2024, and we are currently analyzing these data obtained. In the future, we will examine the effectiveness of the drone thermal observation, including the observation method, for evaluating volcanic activity by calculating the amount of heat radiation after carefully examining the correction method for the obtained temperature observation values.
The UAVs and thermal camera used for the observations were DJI Matrice 300RTK and DJI Zenmuse XT2 and all UAV flight operations and photography were outsourced to a contractor. In FY2023, based on the knowledge gained from previous observations, we planned to create an orthorectifed mosaic image of an area of about 1,700 m2, including the summit crater of Mt. Mihara, with a ground resolution of about 30 cm/pixel by setting both the direction of travel and the lap rate between courses to 90%. To collect these data in one night, two drones with separate take-off and landing positions were used to simultaneously observe two areas, one in the north and the other in the south. Due to expected individual differences in the thermal cameras mounted on each drone, known temperature observations were also made at several altitudes to ensure the accuracy of the temperature observations. Furthemore, During the drone flights, portable meteorological instruments were mounted to measure air temperature and humidity at the altitude of the drone, and observations were made using the RTK function.
Actual observations were conducted in early February 2024, and we are currently analyzing these data obtained. In the future, we will examine the effectiveness of the drone thermal observation, including the observation method, for evaluating volcanic activity by calculating the amount of heat radiation after carefully examining the correction method for the obtained temperature observation values.