https://en.wikipedia.org/wiki/Web_Mercator_projection#Advantages_and_disadvantages https://en.wikipedia.org/wiki/Web_Mercator_projection#Advant... This is done

https://en.wikipedia.org/wiki/Web_Mercator_projection#Advantages_and_disadvantages https://en.wikipedia.org/wiki/Web_Mercator_projection#Advant... This is done to optimize for computer display. Also makes each discrete zoom level 2x of the previous one, and makes nice square map tiles. Other projections are possible but end up with wierd map tiles, defeating smooth scroll on the draggable map.