Interface

#include <codecogs/geometry/spherical/angulardistance.h>

	double	angularDistance (const Position &start, const Position &end) Returns the "distance" in radians (about the spheres centre) between two positions.
	double	distance (const Position &start, const Position &end, double radToDist=3437.7475) Returns the distance from the start position to the 'end' position.

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Function Documentation

Calculates the angular between two points on the surface of a sphere relative to the centre of the sphere.

This calculation is made using: where a and b are the start and end location.

Example:

#include <stdio.h>
#include <codecogs/geometry/spherical/angularDistance.h>
 
int main()
{
  Position start(10,-90);
  Position end(45,20);
  printf("Angular Distance in Radians = %lf", angularDistance(start, end)); 
	return 0;
}

Output:

Angular Distance in Radians = 1.686437

Parameters:

start	the first Position [Latitude, Longitude].[const][reference]
end	the second Position [latitude, Longitude].[const][reference]

Returns:

the distance in radian about the center of the sphere.

Source Code:

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Applies a simple conversion to the distance calculated by angularDistance to give a more conventional measure of distance according to the specified conversion ratio. This is simple the circumference of the sphere divided by . For example, with the planet earth on degree is divided into 60, which is called 1 minute of arc. This is also one nautical mile. Therefore to convert radian to nautical miles (knots) you multiply by:

Description	radToDist
Nautical Mile on Earth	3437.7475 knots/radian
Miles on Earth	3956.0881 miles/radian
kilometers on Earth	6366.7070 km/radian

Example:

#include <stdio.h>
#include <codecogs/geometry/spherical/angulardistance.h>
 
int main()
{
  Position start(10,-90);
  Position end(45,20);
  printf("\nKnots = %lf", distance(start, end)); 
  printf("\nMiles = %lf", distance(start, end, 3956.0881)); 
	return 0;
}

Output:

Knots = 5797.543498
Miles = 6671.692101

Parameters:

start	the first Position [Latitude, Longitude].[const][reference]
end	the second Position [latitude, Longitude].[const][reference]
radToDist	Default Value = 3437.7475

Returns:

the distance to new position.

Source Code:

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