Table 3.

Pearson correlation coefficients between extractions averaged from the four nearest grids and buffers of 5, 10 and 20 km. Note 1: population data were excluded as the original data were collected at the highest resolution available from population censuses in vector format, and then uniformly distributed to a raster pixel or grid. The method adopted is detailed elsewhere [46].

	Kenya			Malawi			Nigeria			Tanzania
	5 km	10 km	20 km	5 km	10 km	20 km	5 km	10 km	20 km	5 km	10 km	20 km
night-time light	0.978	0.933	0.859	0.958	0.863	0.673	0.976	0.914	0.802	0.966	0.891	0.812
aridity	0.997	0.989	0.964	0.995	0.988	0.974	1.000	1.000	1.000	0.996	0.983	0.958
potential evapotranspiration	0.996	0.989	0.968	0.989	0.970	0.940	1.000	0.999	0.999	0.995	0.982	0.948
land surface temperature	0.978	0.994	0.970	0.956	0.988	0.946	0.995	0.997	0.972	0.960	0.986	0.906
vegetation index	0.948	0.988	0.961	0.926	0.979	0.933	0.974	0.992	0.961	0.928	0.982	0.929
elevation	0.998	0.994	0.984	0.990	0.974	0.949	0.996	0.991	0.984	0.998	0.993	0.981