Gridded Population of the World, Version 4 (GPWv4): Population Density

The Gridded Population of the World, Version 4 (GPWv4) Population Density consists of estimates of human population density based on counts consistent with national censuses and population registers, for the years 2000, 2005, 2010, 2015, and 2020. A proportional allocation gridding algorithm, utilizing approximately 12.5 million national and sub-national administrative units, is used to assign population values to 30 arc-second (~1 km) grid cells. The population density grids are derived by dividing the population count grids by the land area grids. The pixel values represent persons per square kilometer.

世界栅格人口第四版（The Gridded Population of the World, Version 4，简称GPWv4）人口密度数据集，包含2000年、2005年、2010年、2015年及2020年的人口密度估算值，该估算基于与全国人口普查和人口登记数据相符的人口计数结果。本数据集采用比例分配栅格化算法，依托约1250万个国家级与次国家级行政单元，将人口数值分配至30角秒（约1千米）的栅格单元中。人口密度栅格由人口计数栅格除以陆地面积栅格推导得到，其像素值代表每平方公里的人口数。