Classifying Urban Functional Zones via a Multilevel Graph Neural Network and Multimodal Geospatial Data. - Tongzheng Zhang; Zhiwei Xie 003; Shuaizhi Zhai; Wanli Xu; Zhen Qian; Min Chen 008; Lishuang Sun; Fengyuan Zhang; Dayong Yang (IEEE J. Sel. Top. Appl. Earth Obs. Remote. Sens., 2025)