Layer-explicit forest understory measurement: Assessing the capability of UAV LiDAR to extract understory vegetation structure - Zhiyong Qi; Haitao Yang; Zekun Yang; Zitong Bai; Ang Chen; Yixuan Zhang; Yu Ren; Junmin Zhang; Tianyu Xiang; Shiyu Yan; Guangcai Xu; Qinghua Guo (Agricultural and Forest Meteorology, 2026)