Toward accurate disease diagnosis of fruit trees: Integrating a novel dual-angle vegetation index with canopy vertical distribution knowledge - Wenjie Zhang; Guijun Yang; Xinlian Liang; Xiaohong Liu; Jianbo Qi; Hao Yang; Haikuan Feng; Bo Li; Changyuan Zhai; Baoguo Wu; Xiaohui Su; Liping Chen; et al. (Remote Sensing of Environment, 2026)