Fig. 3From: Using gridded population and quadtree sampling units to support survey sample design in low-income settingsa Original WorldPop layer [SOM15adjv4.tif = Somalia (AGO) population count map for 2015 [15] adjusted to match UN national estimates (adj), version 4 (v4)], b smoothed layer after applying a Gaussian smoothing kernel technique with a standard deviation of 500 m and c high-resolution satellite imagery [48]Back to article page