Multi-model drought index for Pakistan's croplands: A data fusion framework and comparative performance analysis - Akash Hussain; Wenting Han; Muhammad Amjad Saleem; Mubashir Ali Ghaffar; Mohsin Ijaz; Wajahat Waseem; Mahmood Hemat; Atiyyah Rafaqat (Physics and Chemistry of the Earth, Parts A/B/C, 2026)