Gridded Population of the World, Version 4 (GPWv4): Basic Demographic Characteristics, Revision 11

The Gridded Population of the World, Version 4 (GPWv4): Basic Demographic Characteristics, Revision 11 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.

世界网格化人口数据集第4版（GPWv4）：基础人口特征修订版11包含2010年按年龄和性别划分的人口估计数据，形式为计数（每像素人数）和密度（每平方公里人数），且与各国人口普查及人口登记数据保持一致。为估算2010年按年龄划分的男性和女性人口，研究人员计算了特定普查年份中0-4岁至85岁以上各5岁年龄组的男女性别比例。随后，将这些比例应用于2010年总人口估计数，以得到2010年按年龄划分的男女人口估计值。在某些情况下，年龄和性别比例数据的空间分辨率低于其应用对象（总人口估计数）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。数据文件以全球栅格形式生成，分辨率为30弧秒（赤道地区约1公里）。为实现更快速的全球数据处理并支持研究社区，30弧秒分辨率的数据被聚合至2.5弧分、15弧分、30弧分及1度分辨率。