Does Web Mercator imply erroneous geospatial positioning?

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  1. Finally, some math on our blog! 🙂 Besides ease of calculation, Web Mercator has another advantage for some applications. For example, take our project We chose Mercator because the projection is conformal: a small part of the map (let’s say 2km, within a pedestrian’s reach) has_locally_ only small distortions. That’s everywhere in the world – even in Scotland or Iceland. So for Walkalytics, we can use one single projection for the whole world, which is a huge benefit in terms of processing and data storage. Additionally, directions are preserved (North is always upright, since WebMercator is cylindrical), which is nice for routing purposes.

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