Gridded Population of the World, Version 4 (GPWv4): Basic Demographic Characteristics, Revision 10

The Gridded Population of the World, Version 4 (GPWv4): Basic Demographic Characteristics, Revision 10 consists of estimates of human population by age and sex as counts (number of persons per pixel) and densities (number of persons per square kilometer), consistent with national censuses and population registers, for the year 2010. To estimate the male and female populations by age in 2010, the proportions of males and females in each 5-year age group from ages 0-4 to ages 85+ for the given census year were calculated. These proportions were then applied to the 2010 estimates of the total population to obtain 2010 estimates of male and female populations by age. In some cases, the spatial resolution of the age and sex proportions was coarser than the resolution of the total population estimates to which they were applied. The population density rasters were created by dividing the population count rasters 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 data were aggregated to 2.5 arc-minute, 15 arc-minute, 30 arc-minute and 1 degree resolutions.

世界栅格人口数据集第4版（GPWv4）：基本人口统计特征 修订版10，包含2010年按年龄和性别划分的人口估算数据，涵盖人口计数（每像素人口数）与人口密度（每平方公里人口数），所有数据均与各国人口普查及人口登记记录保持一致。为估算2010年分年龄分性别人口，研究人员首先针对对应普查年份，计算了0-4岁至85岁及以上各5年年龄组的男女性别占比。随后将上述性别年龄占比应用于2010年总人口估算数据，以此得到2010年分年龄分性别人口的估算值。在部分场景中，年龄与性别占比数据的空间分辨率低于其所应用的总人口估算数据的分辨率。人口密度栅格（raster）通过将人口计数栅格除以土地面积栅格生成。本数据集以30角秒（赤道处约1公里）分辨率的全球栅格格式生成。为提升全球数据处理效率并支持科研社区发展，30角秒分辨率的原始数据被聚合为2.5角分、15角分、30角分以及1度四种分辨率版本。