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The main difference between GPW and GRUMP population grids are their
inputs and outputs. GPW is simple, areal-weighted redistribution of
census inputs from their census boundaries (or administrative polygons)
to a uniform quadrilateral grid. The GRUMP population grid should be
considered lightly modeled. Although it also uses areal weighting to
redistribute population from polygons to grid, it uses urban polygons as
well as administrative polygons and makes assumptions about the
parameters of the assignment in those urban areas. Also, the population
grid for GPW is available at a 2.5 minute resolution, whereas GRUMP is
available at a higher resolution of 30 arc seconds (or nominally, 1 km).
GRUMP data products also include settlement points and urban extent
databases.