Three types of data used for UFZ mapping in the GBA

Three types of data are used to support UFZ mapping in the Guangdong-Hong Kong-Macao Greater Bay Area(GBA),including POI data, HSR images and road networks.They share the same projected coordinate System,WGS84 Web Mercator.The POI data were extracted from a Chinese online map platform, AutoNavi Map (https://lbs.amap.com/), in January 2024, totalling 1,927,094 records. Each record included latitude, longitude, and attribute information of categories.The HSR images included Jilin-1 satellite images and Google Earth images, which were collected around January 2024 and covered all cities in the GBA. All HSR images had a spatial resolution of 1 meter and included red, blue and green bands.The road networks were downloaded from OpenStreetMap as vector data, which included hierarchical information, arranged in descending order as: 'primary roads', 'secondary roads', 'tertiary roads', 'minor roads', and 'other roads'.HSR images and POI data are used to provide visual and social-economic information,which is crucial for UFZ mapping.Manual feature or deep feature could be extracted from HSR images and POI data.Road vectors are used to generate UFZ spatial units, which feature multi-level structure. On a practical basis, the road networks could be used to generate UFZ units of different scales