Enhancing canopy nitrogen estimation in Torreya Grandis based on advanced SLIC-EVI and HMT-seCNN methods using hyperspectral UAV data - Liuchang Xu; Xinyuan Su; Ketao Wang; Tong Zhou; Chenghao Lu; Junqi Niu; Xiaochen Jin; Jianqin Huang; Hailin Feng (Computers and Electronics in Agriculture, 2025)