[M-TT49] GEOSCIENTIFIC APPLICATIONS OF HIGH-DEFINITION TOPOGRAPHY AND GEOPHYSICAL DATA IN THE ANTHROPOCENE

[MTT49-01] Assessing topographical change of peatland using drones

*Kotaro Iizuka¹, Tsuyoshi Kato², Asep Andi Yusup², Sisva Silsigia², Alifia Yuni Soufiningrum² (1.Center for Spatial Information Science, University of Tokyo, 2.PT Mayangkara Tanaman Industri / PT Wana Subur Lestari)

Keywords:UAV, Drone, Remote Sensing, Peatland, Indonesia, Digital Elevation Model

Peatland ecosystem store large amounts of soil carbon and constitute an important component of the global carbon cycle, which not only plays a role in the storage of carbon in forest and peat, but also in controlling water resources and in preserving bio-resources and biodiversity. In the past decade, the use and development of peatland in Indonesia have been more extensive because of conversion of peatland to agricultural land. The drainage of peatlands without any well-planned management causes irreversible lowering of the surface (subsidence) as a consequence of peat shrinkage and biological oxidation. The conventional approaches utilize such as poles for observing the subsidence rate of the peat, which lacks in knowledge for the spatial distribution of the subsidizing event. This work focus on utilizing the emerging trends of the Unmanned Aerial Vehicles (UAVs) for collecting high definition terrain information of the peat environment through the Structure from Motion photogrammetry method. The observed terrain data was compared with the past data to see the topographical changes of the peats. The results represents the heterogeneity of the subsidence at a spatial scale. The mean subsidence was shown -26 cm, although there are fluctuations in the phenomenon. The amount of CO₂ possibly emitted from the subsiding event is computed and we will further investigate its trend together with other relating data to understand the characteristics of the subsiding areas.