Gridded Population of the World, Version 3 (GPWv3): Population Density Grid, Future Estimates

The Gridded Population of the World, Version 3 (GPWv3): Population Density Grid, Future EstimatesFuture Estimates consists of estimates of human population for the years 2005, 2010, and 2015 by 2.5 arc-minute grid cells. A proportional allocation gridding algorithm, utilizing more than 300,000 national and sub-national administrative Units, is used to assign population values to grid cells. The future estimate population values are extrapolated based on a combination of subnational growth rates from census dates and national growth rates from United Nations statistics. All of the grids have been adjusted to match United Nations national level population estimates. The population density grids are derived by dividing the population count grids by the land area grid and represent persons per square kilometer. The grids are available in various GIS-compatible data formats and geographic extents (global, continent [Antarctica not included], and country levels). GPWv3 is produced by the Columbia University Center for International Earth Science Information Network (CIESIN) in collaboration with Centro Internacional de Agricultura Tropical (CIAT).

世界人口网格化数据集版本3（GPWv3）：人口密度网格，未来预测
未来预测部分包含了针对2005年、2010年和2015年的人口估计数据，这些数据按2.5弧分钟网格单元进行划分。本数据集采用一种比例分配网格化算法，该算法利用超过30万个国家和次国家级的行政单元，将人口值分配至网格单元中。未来的人口估计值基于从人口普查日期得出的次国家级增长率与联合国统计数据中的国家增长率相结合的方式进行外推。所有网格数据均已调整，以与联合国国家层面的人口估计值相匹配。人口密度网格是通过将人口计数网格与土地面积网格相除而得，表示每平方公里的居民数量。这些网格数据以多种地理信息系统兼容的数据格式和地理范围（全球、洲际[不包括南极洲]、国家级别）提供。GPWv3由哥伦比亚大学国际地球科学信息网络中心（CIESIN）与国际热带农业研究中心（CIAT）合作制作。