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. Author manuscript; available in PMC: 2014 Mar 9.
Published in final edited form as: Travel Med Infect Dis. 2013 Mar 9;11(1):15–22. doi: 10.1016/j.tmaid.2012.12.003

Figure 1. The density of mobile phone towers across Kenya.

Figure 1

A spatial kernel density was estimated in Kenya using the location of all mobile phone towers owned by the leading mobile phone operator in the country. The density of mobile phone towers is an estimate of uncertainty of using CDR data to quantify travel. In Nairobi and Mombasa, the two largest cities in the country, the mobile phone tower density is high leading to more certainty of mobility estimate. In the rural areas of eastern and northern Kenya, the uncertainty is lower due to poor tower coverage. The density of towers is strongly correlated with population density (R2 = 0.688, p < 0.001).