Land and Geographic Unit Area Grids, v3 (1990, 1995, 2000, 2005, 2010, 2015)

The Gridded Population of the World, Version 3 (GPWv3) Land and Geographic Unit Area Grids measure land areas in square kilometers and the mean unit size (population-weighted) in square kilometers. The land area grid permits the summation of areas (net of permanent ice and water) at the same resolution as the population density, count, and urban-rural grids. The mean unit size grids provides a quantitative surface that indicates the size of the input unit(s) from which population count and density grids are derived..GPWv3 is produced by the Columbia University Center for International Earth Science Information Network (CIESIN) in collaboration with Centro Internacional de Agricultura Tropical (CIAT).

世界栅格人口数据集第三版（Gridded Population of the World, Version 3，GPWv3）的土地与地理单元面积栅格，可测算以平方千米为单位的土地面积，以及经人口加权后的平均单元面积（单位：平方千米）。该土地面积栅格支持在与人口密度、人口数量及城乡栅格一致的分辨率下，对区域面积（扣除永久冰雪与水域后的净面积）开展求和统计。平均单元面积栅格可提供一张定量表面，用以表征生成人口数量与人口密度栅格所依赖的输入单元的尺寸。GPWv3由哥伦比亚大学国际地球科学信息网络中心（Center for International Earth Science Information Network, CIESIN）与国际热带农业中心（Centro Internacional de Agricultura Tropical, CIAT）联合研制。