The latest update to the Gridded Population of the World data collection, GPW version 4.11, provides access to more than 100 interactive map layers through a Web Map Service (WMS), facilitating visualization through map tools such as the SEDAC Map Viewer. The WMS now includes 78 map layers for population estimates by age and sex categories for the year 2010, enabling users to explore potential differences in the spatial distribution of specific population subgroups. Version 4.11, available from the NASA Socioeconomic Data and Applications Center (SEDAC) operated by CIESIN, also corrects several technical issues from the previous version, most notably re-coding missing data values.
First developed in 1994, GPW has been used widely to support research, planning, and applications on diverse topics, including energy and water management, disaster and humanitarian response, agriculture and food security, public health, transportation and communications, and urban and coastal zone planning. The recently released age and sex data expand GPW’s usefulness for mapping differential vulnerability and risk, studying urbanization and migration, assessing emergency response and public health needs, and other sustainable development applications. The data are free and downloadable from SEDAC, which also provides detailed documentation, premade maps, and interactive mapping tools. Free registration with NASA's Earthdata system is required to download data and maps.