Demographic data play a significant role in many HarvestChoice analyses. Specific population datasets used by HarvestChoice, where possible in spatially explicit formats, include:
GPW (Gridded Population of the World). This dataset compiled and maintained by CIESIN, Columbia University provides a gridded estimate of total population counts and densities at a resolution of 2.5 arc minutes (approximately 5km at the equator). The gridded data for GPW Version 3 is calibrated to 2000, and is based on approximately 400,000 individual polygons of population census data. Derived GPW products include grid-based projections of population and population density to 2015.
GRUMP (Global Rural-Urban Mapping Project). This is a derived and expanded product of GPW v3 developed by CIESIN, CIAT, IFPRI and the World Bank, that includes the following data components for the year 2000:
- The point location and population of human settlements globally (with the goal of capturing all settlements of greater than 5,000-10,000 population, although this goal was not consistently achieved),
- The physical extent of urban areas corresponding to each human settlement point, and
- Gridded population headcount and density, locating the statistically reported urban populations in the mapped urban extents and the statistically reported rural populations in the non-urban areas. The gridded population density layer is available at a resolution of 30 arc seconds (approximately 1km at the equator).
UN World Population Prospect. These population and population density data are developed and maintained by the United Nations Population Division. The tabular dataset contains a mix of historic and projected regional and national total populations from 1950 to 2050. Unless otherwise specified, HarvestChoice uses the UN's "medium variant" for its population and food demand projection estimates.