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Zhou, Shuai, Yanling Li, Guangqing Chi, Sy-Miin Chow, and Yosef Bodovski. 2020. " GPS2space: An Open-source Python Library for Spatial Data Building and Spatial Measure Extraction." [python package]. Available at https://gps2space.readthedocs.io/en/latest. Released on September 23, 2020.