Fig. 2

Geographical spatial distribution map of the eight urban agglomerations in China. Produced based on the Ministry of Natural Resources Standard Map Service website, Standard Map No. GS(2019)1822, with no modifications to the boundaries of the base map. The map was created using ArcGIS, version 10.7 (https://www.esri.com/en-us/arcgis/about-arcgis/overview).