UAV-based low-altitude remote sensing in built-environment thermal studies: A review across different spatial scales - Xue Zhong; James Voogt; Wenfeng Zhan; Xiang Zhang; Zhongwei Shen; Lihua Zhao; Peng Ren; Jie Wang; Renzhi Wu; Yuanjian Teng; Yingzi Zhang (Building and Environment, 2026)