Google Maps has inconsistent zoom level / scale ratio

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At the same zoom level, the scale bar of a map from Google Maps API (v3) can have different sizes. Here are two screenshots I took at the same zoom level on the same map at two different locations.

Indianapolis


Cambridge (UK)


You can try it yourself on this page (go to the second map, the one with the scale bar).http://tech.reumer.net/Google-Maps/Demo-Google-Maps-V3/show-all.html

In my application, I have two maps and I want these maps to always have the same scale. I started out by forcing them to be at the same zoom level (with some js listeners), but it looks like it's not going to be enough.

Is there a way to force same scale maps or a specific scale (as opposed to a specific zoom level) on Google Maps API? Which competitors offer this feature?



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