Why does size of circle object drawn in Google Maps increase when moving it away from Equator

by Maurice   Last Updated October 19, 2019 21:22 PM - source

I'm building a web app that allows the user to search the database based on his Google Maps location and a customizable search area around the location. I've noticed that when I keep the radius of the circle constant (500 miles) the circle is a lot smaller when I place it near the equator then when I place its center in Finland. At first I thought this was caused by a coding error but upon inspection I could find none. Now my second guess is that this sudden change is perhaps caused by the curvature of the Earth. The more the latitude value moves away from 0 (the equator) the larger the circle becomes.

What causes my circle to enlarge when I move my position to one of the poles and how can I prevent the circle from increasing?

With what constant do I need to correct the radius input after each Google Maps position change?

500 mile blue circle near the Equator

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500 mile blue circle in Finland which is rendered a lot larger

enter image description here



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