Global Rural-Urban Mapping Project, Version 1 (GRUMPv1): Land and Geographic Unit Area Grids

The Global Rural-Urban Mapping Project, Version 1 (GRUMPv1): 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 provide a quantitative surface that indicates the size of the input Unit(s) from which population count and density grids are derived. Additional global grids are created from the 30 arc-second grid at 1/4, 1/2, and 1 degree resolutions. This data set is produced by the Columbia University Center for International Earth Science Information Network (CIESIN) in collaboration with the International Food Policy Research Institute (IFPRI), The World Bank, and Centro Internacional de Agricultura Tropical (CIAT).

全球城乡映射项目，版本1（GRUMPv1）：该数据集包含土地和地理单元面积网格，用以衡量平方千米内的土地面积以及平均单元大小（以人口加权，单位为平方千米）。土地面积网格允许在相同分辨率下（与人口密度、计数和城乡网格相同）对区域面积进行求和（扣除永久冰雪和水域后的净面积）。平均单元大小网格提供了一个量化表面，用以指示输入单元的尺寸，这些尺寸是人口计数和密度网格所依据的来源。此外，从30弧秒网格衍生出1/4度、1/2度和1度分辨率的额外全球网格。本数据集由哥伦比亚大学国际地球科学信息网络中心（CIESIN）与国际食物政策研究所（IFPRI）、世界银行以及国际热带农业研究中心（CIAT）合作生产。