Gridded Population of the World, data are based on administrative unit and census data. The data are collected are based on where people reside, and therefore will underestimate day time populations in business and industrial areas. The data are referenced at a resolution of 2.5 arc-minutes in GPWv3, or 30 arc-seconds in GPWv4 and are only suitable for use with larger polygons that are greater than both the native raster resolution and the input administrative unit size. As the input administrative resolution varies widely over the globe, the output table includes a quality warning field that is flagged with a value of 1 where the land area in the input polygon is less than the average size of the administrative units that intersect the polygon. CIESIN follows procedures designed to ensure that data disseminated by CIESIN are of reasonable quality. If, despite these procedures, users encounter apparent errors or misstatements in the data, they should contact SEDAC User Services at +1 845-365-8920 or via email at firstname.lastname@example.org. Neither CIESIN nor NASA SEDAC verifies or guarantees the accuracy, reliability, or completeness of any data provided. CIESIN provides this data without warranty of any kind whatsoever, either express or implied. CIESIN shall not be liable for incidental, consequential, or special damages arising out of the use of any data provided by CIESIN.
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