Estimated equivalent population using public supply water in the conterminous United States, CEM
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The population using public supply drinking water was mapped in two ways: the census enhanced method (CEM) evenly distributes the population across the census block-...
饮用公共供水的人口采用两种方式进行空间制图:人口普查增强法(Census Enhanced Method, CEM)将人口均匀分布于普查区块——



