Gridded Population of the World, Version 3 (GPWv3): Land and Geographic Unit Area Grids

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，第三版（GPWv3）》：该数据集通过土地和地理单元面积栅格测量平方公里内的土地面积，并计算平均单元尺寸（按人口加权，单位：平方公里）。土地面积栅格允许以与人口密度、计数和城乡栅格相同的分辨率汇总面积（扣除永久冰雪和水面）。平均单元尺寸栅格提供了一个定量表面，用以指示输入单元的大小，该单元为人口计数和密度栅格的来源。GPWv3由哥伦比亚大学国际地球科学信息网络中心（CIESIN）与热带国际农业研究中心（CIAT）合作制作。