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
		<To provide a raster representation of nation-states in GPWv4 for use in aggregating population data.>

	Data Quality Indicators Mean Administrative Unit Area
		<provides a quantitative surface that indicates the size of the input unit(s) from which population count and density grids are derived.>


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 Twitter or Facebook (Socioeconomic Data and Applications Center).