Gridded Population of the World, Version 4 (GPWv4): Land and Water Area, Revision 10

The Gridded Population of the World, Version 4 (GPWv4): Land and Water Area, Revision 10 consists of two rasters that measure surface areas of land and water in square kilometers per pixel. The Land Area raster provides estimates of the land area, excluding permanent ice and water, within each pixel, and was used to calculate the population density rasters. The Water Area raster provides estimates of the water area (permanent ice and water) within each pixel. The sum of land area and water area of a pixel equals the total surface area of that pixel. 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.

世界栅格人口第四版（Gridded Population of the World, Version 4，简称GPWv4）：水陆面积 修订版10 由两个栅格图层组成，用于以平方千米每像素为单位测算地表的陆地与水域面积。其中陆地面积栅格可估算每个像素内排除永久性冰盖与水体的陆地面积，曾被用于计算人口密度栅格；水域面积栅格则可估算每个像素内的水域（含永久性冰盖与水体）面积。单个像素的陆地面积与水域面积之和，等于该像素的总地表面积。该数据以全球栅格形式制作，分辨率为30弧秒（赤道处约1千米）。为支持全球快速处理并服务科研社区，该30弧秒分辨率数据被聚合为2.5弧分、15弧分、30弧分以及1度四种分辨率。