See the FAQ page for more details or watch the brief intro video to learn what′s new in GPWv4. This is an advantage of GPW because minimally modeled census information may be analyzed in conjunction with other data sets, such as land cover and elevation, without concern for endogeneity, or double counting.
Gridded paper license#
The GPW data collection is licensed under the Creative Commons Attribution 4.0 International License ( ), thus providing openly-available, gridded population data that maintains fidelity to the input census data. Additional details on the improvements made for Revision 11 can be found on the web page What’s New in Revision 11. All spatial data sets in the GPWv4 collection are stored in geographic coordinate system (latitude/longitude). NetCDF files are available at all resolutions except 30 arc-second. All of these resolutions are available in ASCII and GeoTIFF formats. In addition, the native 30 arc-second resolution data were aggregated to four lower resolutions (2.5 arc-minute, 15 arc-minute, 30 arc-minute, and 1 degree) to enable faster global processing and support of research communities that conduct analyses at these resolutions (Table 1). Five of the eight raster data sets are also available in netCDF format. The raster data sets are now available in ASCII (text) format as well as in GeoTIFF format. A vector data set of the center point locations (centroids) for each of the input administrative units and a raster of national level numeric identifiers are included in the collection to share information about the input data layers. In addition, rasters are available for basic demographic characteristics (age and sex), data quality indicators, and land and water areas. All estimates of population counts and population density have also been nationally adjusted to population totals from the United Nation’s World Population Prospects: The 2015 Revision. Separate rasters are available for population counts and population density consistent with national censuses and population registers, or alternative sources in rare cases where no census or register was available.
Gridded paper zip#
In addition, two attributes were added to indicate the administrative levels of the demographic characteristics input data, and the data set zip files were corrected to include the National Identifier Polygons shapefile.
Gridded paper full#
A set of estimates adjusted to national level, historic and future, population predictions from the United Nation's World Population Prospects report are also produced for the same set of years. The input data are extrapolated to produce population estimates for the years 2000, 2005, 2010, 2015, and 2020. It provides globally consistent and spatially explicit data for use in research, policy-making, and communications.įor GPWv4, population input data are collected at the most detailed spatial resolution available from the results of the 2010 round of Population and Housing Censuses, which occurred between 20. The purpose of GPW is to provide a spatially disaggregated population layer that is compatible with data sets from social, economic, and Earth science disciplines, and remote sensing. Since the release of the first version of this global population surface in 1995, the essential inputs to GPW have been population census tables and corresponding geographic boundaries. The Gridded Population of the World (GPW) collection, now in its fourth version (GPWv4), models the distribution of human population (counts and densities) on a continuous global raster surface.
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