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In page Wuhan:
"The encompassing metropolitan area was estimated by the OECD (Organization for Economic Cooperation and Development) to have, as of 2010, a population of 19 million.[9][10] As of November 2019 urban development status considering both spatial and socioeconomic processes has been examined using Night Time Lighting data and land cover data as proxies; it showed Wuhans high concentration of socioeconomic activities compared to its urban spatial development.[11]
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