Distance between 2 geographic coordinates?

Question

C++ / C#

Hello, how can I calculate the distance between 2 geographic coordinates?
you need to calculate and save in the database
With an error of a maximum of 1-10 meters

Answer 1

The boxed Int32 also implements the IComparable interface, but since the boxed Int32 was cast to an Object type, an explicit cast to the interface type is required.

Answer 2

System.Int32 implements IComparable so there will be no exception.

Answer 3

When you write "number." in the last line, the system has no idea that obj contains an int value and just shows the methods for the IComparable interface.
But this does not mean that the code will work)

Answer 4

Formula:
https://en.wikipedia.org/wiki/Haversine_formula
Implementation:
https://pypi.python.org/pypi/haversine

Answer 5

www.movable-type.co.uk/scripts/latlong.html