I've been trying to debug an issue with geographic_point_circle wherein I can't seem to create a circle of radius 10 metres.

The easy-to-reproduce symptom is that the area of the circle varies greatly with only a small change in latitude or longitude.

See this StackOverflow post for details: https://stackoverflow.com/questions/65493910/boost-point-circle-coming-out-in-weird-shapes/

In order to produce a suitable circle of that scale, I need to use long double in my point type, but with an epsilon of ~1mm, a regular double ought to work fine. Is there something I'm missing about the implementation of point_circle or bg::area that would imply that this is expected behaviour?

Kind regards,

Chris