c#: Distance from point to a line segment (in longitude and latitude)

Question

I have a position (A) in longitude and latitude.

I have a line segment with start (B) and end (C) points in longitude and latitude.

What I am trying to calculate is the shortest distance from A to line B<->C. In other words the distance from A to the closest point (on line BC) in meters.

Thanks in advance.

Answer 1

I think you could read this link to get the intersection point between A and the perpendicular line to BC passing on A.
Then using formulas (and code ready) from here you should be able to solve your problem.