The Gridded Population of the World (version 4) released
The Gridded Population of the World (GPW) series models the distribution of human population (counts and densities) on a continuous global surface. Since the release of the first version of this global population grid in 1995, the essential inputs have been population census tables and corresponding geographic boundaries. For GPWv4, population input data are collected at the most detailed spatial resolution available from the results of the 2010 round of censuses, which occurred between 2005 and 2014. The input data are extrapolated to produce population estimates for the years 2000, 2005, 2010, 2015, and 2020. 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 set same set of years. GPWv4 is gridded with an output resolution of 30 arc-seconds (approximately 1 km at the equator).
The GPW data collection provides openly-available, licensed under the Creative Commons Attribution 4.0 International License, gridded population data that maintains fidelity to the input census. This is an advantage of GPW because minimally modeled census information may be analyzed in conjunction with other data sets such as land cover without concern for endogeneity, or double counting. In order to broaden the applicability of GPWv4, the data collection will be expanded in future releases to include global population grids of Basic Demographic Characteristics (age and sex) estimated for 2010 and urban/rural designations as defined by national statistics offices.
GPWv4 was produced by CIESIN at Columbia University with primary support from the National Aeronautics and Space Administration under Contract NNG13HQ04C for the Socioeconomic Data and Applications Distributed Active Archive Center (DAAC) for the EOS Data and Information System (EOSDIS).
How Many People Affected by a Hazard? Updated Service Provides Answers
The updated Population Estimation Service (PES) uses data from the Gridded Population of the World version 4 (GPWv4) data collection to quickly obtain estimates of the number of people residing in an area defined by the user. The PES is a Web-based service that enables mapping tools to quickly obtain estimates of the number of people residing in an area of interest, without having to download and analyze large amounts of spatial data. The latest version of PES, available through the NASA Socioeconomic Data and Applications Center (SEDAC) operated by CIESIN, draws on data from SEDAC′s recently released Gridded Population of the World, version 4 (GPWv4) data collection. It provides population estimates and associate statistics for the years 2000, 2005, 2010, 2015, and 2020. A new client application, the SEDAC Population Estimator, enables users to draw a polygon or circle around an area of interest, and then obtain an estimate of the population in 2015 living in that area. Other SEDAC mapping tools such as the HazPop mobile app also utilize the updated PES, supporting analysis and visualization of population data in conjunction with remote sensing imagery and other types of data such as the location of critical infrastructure. The PES was first released in 2010.
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