Is an Unmanned Aerial Vehicle (UAV) Suitable for Extracting the Stand Parameters of Inaccessible Underground Forests of Karst Tiankeng? by Wei Shui, Hui Li, Yongyong Zhang, Cong Jiang, Sufeng Zhu, Qianfeng Wang, Yuanmeng Liu, Sili Zong, Yunhui Huang, Meiqi Ma

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