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This study uses multi-temporal Sentinel-2 high-resolution images and POI data that can reflect detailed features of human activities to extract multi-dimensional features and use random forests and mathematical ... morphology to map the urban boundaries of the city of Zhengzhou. ... The research was also supported by the National Earth System Science Data Sharing Infrastructure, National Science & Technology Infrastructure of China-Data Center of Lower Yellow River Regions (http:/ ...doi:10.3390/rs12244103 fatcat:m53y6tyjonhrbavboxp3omdsaa