Is an Unmanned Aerial Vehicle (UAV) Suitable for Extracting the Stand Parameters of Inaccessible Underground Forests of Karst Tiankeng? - Wei Shui; Hui Li; Yongyong Zhang; Cong Jiang; Sufeng Zhu; Qianfeng Wang; Yuanmeng Liu; Sili Zong; Yunhui Huang; Meiqi Ma (Remote. Sens., 2022)