In the developed world where many people happily post their current locations on Facebook and can look up the exact locations of buildings online, it is often overlooked how poor locational information on people and settlements can be for lower income regions.
The Democratic Republic of Congo has gone without a population census for 29 years, and estimates of the number of people currently living in Angola can range between 13m and 20m. These are extreme examples, but uncertainties remain common for many of the most vulnerable and disease burdened countries of the world, where such information is most needed.
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