Figure 3From: Modelling strategic interventions in a population with a total fertility rate of 8.3: a cross-sectional study of Idjwi Island, DRC Cluster sampling approach. (Top left) LandScan population grid. (Top right) Coordinates placed in proportion to population density, and 50 coordinates randomly selected. (Bottom) Example of sampling area delineated around the ~ 45 closest dwellings to a selected coordinate in satellite imagery.Back to article page