Unsupervised clustering of global building, vegetation, and imperviousness data produces 27 urban environmental zones covering 85% of the world's population and showing finer mixing of built and green surfaces than prior classifications.
Gridded population of the world, version 4 (GPWv4): population density, revision 11
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Data-driven Urban Surface Classification Elucidates Global City Heterogeneity
Unsupervised clustering of global building, vegetation, and imperviousness data produces 27 urban environmental zones covering 85% of the world's population and showing finer mixing of built and green surfaces than prior classifications.