Predicted IRS coverage at 1x1 km for Senegal with each modelling approach.

The maps show the spatial distribution of the proportion (ranging from 0 to 1) of households that were sprayed with a residual insecticide in the last year prior to the survey. Gridded surfaces are produced at a resolution of 1x1 km for all methods examined in the study. The ‘Out of range’ label indicates predicted values that are outside the possible range of values of the indicator (below 0 or above 1). Out-of-range predictions were made by thin plate spline, ordinary kriging and universal kriging. IRS stands for indoor residual spraying. National boundaries were downloaded from GADM.

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