Input Layers for Global Gridded Data Sets

	Input Variables
Dataset	Population	Roads	Land Cover	Built structures	Cities or Urban areas	Night-time lights	Infrastructure	Environmental data (climate, topography, elevation)	Protected areas	Water bodies
Gridded Population of the World (GPW)	x								x*	x
Global Rural-Urban Mapping Project (GRUMP)	x				x	x			x*	x
LandScan Global Population database	x	x	x	x	x		x	x	x	x
Global Human Settlement Layer – Population (GHS-POP)	x			x
World Population Estimate	x	x	x		x					x
WorldPop	x	x	x	x	x	x	x	x	x	x

* Protected areas are not masked in GPW and GRUMP, but the census bureaus often define the protected areas as no data or 0 (zero), regardless of whether people live in them.

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