Fig. 4
From: Beyond mapping: a case for geospatial analytics in humanitarian health
Map of the 1854 Cholera outbreak in relation to the water supply. John Snow’s mapping of cholera cases demonstrates the spatial approach to the science of public health, the dispersion and clustering of cases and their relationship to a causative agent. Terms of use: this work is licensed under a Creative Commons Attribution Generic License. It is attributed to John Snow and the original work can be found here, https://www.ncbi.nlm.nih.gov/pmc/articles/PMC2250686/pdf/brmedj06236-0004.pdf