Spatial Association characteristics of facilities around scenic spots considering distance and orientation: A case study of 3A and above scenic spots in BeijingHansong Cao, Jiahui Qin, Disheng Yi, Yusi Liu and Jing ZhangE3S Web Conf., 290 (2021) 02001DOI: https://doi.org/10.1051/e3sconf/202129002001