Population Density, v4.11 (2000, 2005, 2010, 2015, 2020)

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.

《世界栅格人口数据集第四版（GPWv4）：人口密度，修订版11》包含2000、2005、2010、2015及2020年的人口密度（单位：人/平方千米）估算值，其人口计数基于与全国人口普查及人口登记数据一致的统计结果。本数据集采用比例分配栅格化算法，利用约1350万个国家级及次级行政区单元，将人口计数分配至30角秒栅格单元中。人口密度栅格通过将对应目标年份的人口计数栅格除以陆地面积栅格生成。数据文件以全球栅格形式产出，分辨率为30角秒（赤道处约1千米）。为提升全球处理效率并支持科研社群，研究人员将30角秒的人口计数数据聚合为2.5角分、15角分、30角分及1度分辨率，以生成对应分辨率的人口密度栅格。

搜集汇总

背景与挑战

背景概述

该数据集提供2000-2020年间全球人口密度的年度估计，基于国家普查数据，采用高精度网格化方法生成多种分辨率的人口密度栅格，适用于全球尺度的研究和分析。