August 2016 Release 4.0 In addition to the native 30 arc-second resolution data, the data have been aggregated to four lower resolutions to enable faster global processing and easier comparison to other data at these resolutions in support of research communities: 2.5 arc-minutes 0.25 degree 0.5 degree 1 degree These aggregated data are available in ASCII (text) and GeoTIFF formats. The data sets available at lower resolution include: Data Quality Indicators Land and Water Area National Identifier Grid Population Count UN-Adjusted Population Count Population Density UN-Adjusted Population Density Several countries are not represented at lower resolutions as their geographic extents are less than a single pixel. The countries present in the 30 arc-second grid that are obscured and not represented at lower resolutions are: 2.5 minutes: 336 - VCS - Holy See 0.25 degree: 20 - AND - Andorra 292 - GIB - Gibraltar 336 - VCS - Holy See 438 - LIE - Liechtenstein 446 - MAC - China Macao Special Administrative Region 492 - MCO - Monaco 663 - MAF - Saint-Martin (French) 674 - SMR - San Marino 0.5 degree: 20 - AND - Andorra 292 - GIB - Gibraltar 336 - VCS - Holy See 438 - LIE - Liechtenstein 446 - MAC - China Macao Special Administrative Region 492 - MCO - Monaco 534 - SXM - Saint Maarten (Dutch) 663 - MAF - Saint-Martin (French) 674 - SMR - San Marino 702 - SGP - Singapore 1 degree: 20 - AND - Andorra 48 - BHR - Bahrain 270 - GMB - Gambia 275 - PSE - State of Palestine 292 - GIB - Gibraltar 336 - VCS - Holy See 344 - HKG - China Hong Kong Special Administrative Region 438 - LIE - Liechtenstein 442 - LUX - Luxembourg 446 - MAC - China Macao Special Administrative Region 492 - MCO - Monaco 531 - CUW - Curacao 533 - ABW - Aruba 534 - SXM - Sint Maarten (Dutch) 652 - BLM - Saint-Barthelemy 663 - MAF - Saint-Martin (French) 674 - SMR - San Marino 702 - SGP - Singapore 831 - GGY - Guernsey 833 - IMN - Isle of Man June 2016 Release 4.0 A prerelease of Gridded Population of the World Version 4 (GPWv4) was made available in the 4th quarter of 2015 in a "Beta" web environment. There have been a number of changes to the GPWv4 collection between the Beta release and version 4.0 This file contains a description of those changes and information on how to obtain the Beta version of GPWv4. Change log: New datasets: National Identifier Grid Data Quality Indicators Mean Administrative Unit Area Country level changes: Egypt (EGY): The Beta version of Egypt's administrative boundaries and population estimates were found to be inaccurate. As a result a new source was acquired and incorporated into version 4.0 Panama (PAN): corrected data integration errors Poland (POL): corrected data integration errors How to access the Beta release: We have preserved the Beta version of the dataset in a long term archive with a unique set of DOIs. Beta dataset DOIs: Population Density - http://dx.doi.org/10.7927/H46T0JKB UN-Adjusted Population Density - http://dx.doi.org/10.7927/H4TH8JNR Population Count - http://dx.doi.org/10.7927/H4BG2KXS UN-Adjusted Population Count - http://dx.doi.org/10.7927/H4PR7SX1 Land and Water Area - http://dx.doi.org/10.7927/H4M043BS Data Quality Indicators - http://dx.doi.org/10.7927/H4QR4V2T Administrative Unit Center Points with Population Estimates - http://dx.doi.org/10.7927/H4VH5KS4 If you would like access to these data, or more information on either release, please email SEDAC User Services at "ciesin.info@ciesin.columbia.edu" or the GPW team at "gpw@ciesin.columbia.edu" and reference the dataset DOIs listed above. To be notified of the latest data releases, including GPWv4, and of related news that may interest you, please consider following SEDAC on Youtube Twitter or Facebook (Socioeconomic Data and Applications Center).