講演詳細

植物生態部門[Forest Ecology]

日付	2026年3月17日
開始時刻	ポスター発表
会場名	多目的ホール
講演番号	PW-4
発表題目	Multi-year monitoring of individual-tree spring phenology using PlanetScope, compared with UAV and ground observations Multi-year monitoring of individual-tree spring phenology using PlanetScope, compared with UAV and ground observations
所属	The University of Tokyo
要旨本文	Monitoring spring leaf phenology at the individual-tree scale is essential for understanding ecosystem responses to climate change. Ground observations provide high accuracy but are constrained by time and labor, while unmanned aerial vehicles (UAVs) offer high spatial resolution but are impractical for frequent monitoring. PlanetScope satellites (3 m resolution) provide a promising alternative. We developed and evaluated a species-specific, rule-based framework to extract leaf emergence dates using multi-year PlanetScope (2021_2025) and single-year UAV (2025) imagery collected for 50 trees. Optimal VIs and normalized thresholds varied among 32 species, reflecting species-specific interactions between canopy structure and leaf optical properties. Compared with a conventional fixed-threshold approach, the framework improved accuracy (lower RMSE; days) and precision (higher r) for PlanetScope imagery, demonstrating its potential for scalable individual-tree phenology monitoring.
著者氏名	○Piyapon Kankong1 ・ Toshiaki Owari2 ・ Takuya Hiroshima1 ・ Nyo Me Htun3
著者所属	1Department of Global Agricultural Sciences, Graduate School of Agricultural and Life Sciences, The University of Tokyo ・ 2The University of Tokyo Hokkaido Forest, Graduate School of Agricultural and Life Sciences, The University of Tokyo ・ 3Forest GX/DX Co-Creation Center, The University of Tokyo Forests, Graduate School of Agricultural and Life Sciences, The University of Tokyo
キーワード	Leaf phenology, PlanetScope, UAV
Key word	Leaf phenology, PlanetScope, UAV