In April Mapzen's Pelias geocoder accidentally started suggesting that Denmark's Copenhagen was in Sweden. Mapzen of course quickly rectified the mistake. However to atone for this error Mapzen has published an interesting article which explains how the mistake was made, how Pelias has been fixed and why Copenhagen is not in Sweden.
The Assault on Copenhagen is not only an interesting read in terms of how Pelias mistakenly placed Copenhagen in Sweden (damn those pesky centroids) but also a really interesting account of the Second Northern War, 1655-1660. In this little history lesson Mapzen explains how Denmark was able to hold on to Copenhagen despite a series of assaults on the city by Sweden.
The article is accompanied by an interactive map which illustrates how King Charles X advanced on Copenhagen in his attempt to capture the city for Sweden.
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