Estimation of Urban Ecosystem Services Value: A Case Study of Chengdu, Southwestern China. - Xiaoai Dai; Brian Alan Johnson; Penglan Luo; Kai Yang; Linxin Dong; Qiang Wang; Chao Liu 030; Naiwen Li; Heng Lu 004; Lei Ma 005; Zhengli Yang; Yuanzhi Yao (Remote. Sens., 2021)