Gridded Population of the World, Version 4 (GPWv4): Population Density, Revision 11
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The Gridded Population of the World, Version 4 (GPWv4): Population Density, Revision 11 consists of estimates of human population density (number of persons per square kilometer) 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 13.5 million national and sub-national administrative Units, was used to assign population counts to 30 arc-second grid cells. The population density rasters were created by dividing the population count raster for a given target year by the land area raster. The data files were produced as global rasters at 30 arc-second (~1 km at the equator) resolution. To enable faster global processing, and in support of research commUnities, the 30 arc-second count data were aggregated to 2.5 arc-minute, 15 arc-minute, 30 arc-minute and 1 degree resolutions to produce density rasters at these resolutions.
《世界栅格人口,第4版(GPWv4):人口密度,修订版11》包含基于与国家人口普查和人口登记一致的数据,对2000年、2005年、2010年、2015年和2020年各年份的人类人口密度(每平方公里人口数)的估计。采用了一种比例分配栅格算法,该算法利用约1350万个国家和次国家行政单元,将人口计数分配至30弧秒的栅格单元中。通过将特定目标年份的人口计数栅格与土地面积栅格相除,创建了人口密度栅格。数据文件以全球栅格形式产生,分辨率为30弧秒(赤道附近约1公里)。为了实现全球处理的加速,并支持研究社群,将30弧秒的人口计数数据聚合至2.5弧分、15弧分、30弧分和1度分辨率,以产生相应分辨率的密度栅格。




