Gridded Population of the World, Version 4 (GPWv4): National Identifier Grid
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资源简介：
The Gridded Population of the World, Version 4 (GPWv4): National Identifier Grid is derived from the input census units to create a raster surface where pixels (grid cells) that cover the same census data source - most often a country or territory - have the same value. Note that these data represent the area covered by the statistical data as provided, and are not official representations of country or territory boundaries.
创建时间：
2016-07-11
