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Estimating small area population from health intervention campaign surveys and partially observed settlement data

Chibuzor Christopher Nnanatu (), Amy Bonnie, Josiah Joseph, Ortis Yankey, Duygu Cihan, Assane Gadiaga, Hal Voepel, Thomas Abbott, Heather R. Chamberlain, Mercedita Tia, Marielle Sander, Justin Davis, Attila N. Lazar and Andrew J. Tatem
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Chibuzor Christopher Nnanatu: University of Southampton
Amy Bonnie: University of Southampton
Josiah Joseph: National Statistical Office
Ortis Yankey: University of Southampton
Duygu Cihan: University of Southampton
Assane Gadiaga: University of Southampton
Hal Voepel: University of Southampton
Thomas Abbott: University of Southampton
Heather R. Chamberlain: University of Southampton
Mercedita Tia: United Nations Population Fund
Marielle Sander: United Nations Population Fund
Justin Davis: Planet Labs
Attila N. Lazar: University of Southampton
Andrew J. Tatem: University of Southampton

Nature Communications, 2025, vol. 16, issue 1, 1-13

Abstract: Abstract Effective governance requires timely and reliable small area population counts. Geospatial modelling approaches which utilise bespoke microcensus surveys and satellite-derived settlement maps and other spatial datasets have been developed to fill population data gaps in countries where censuses are outdated and incomplete. However, logistics and costs of microcensus surveys and tree canopy or cloud cover obscuring settlements in satellite images limit its wider applications in tropical rural settings. Here, we present a two-step Bayesian hierarchical modelling approach that can integrate routinely collected health intervention campaign data and partially observed settlement data to produce reliable small area population estimates. Reductions in relative error rates were 32–73% in a simulation study, and ~32% when applied to malaria survey data in Papua New Guinea. The results highlight the value of demographic data routinely collected through health intervention campaigns or household surveys for improving small area population estimates, and how biases introduced by satellite data limitations can be overcome.

Date: 2025
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DOI: 10.1038/s41467-025-59862-4

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