#include <math.h>
#include <stdbool.h>
#include <stdio.h>

Include dependency graph for vincenty.c:

Macros
#define	VINCENTY_TOLERANCE 1e-12

#define	VINCENTY_MAX_LOOP 1e3

#define	USE_HELMERTS 1

#define	pi 3.14159265358979323846264338327950288419716939937510582097494459230781640628620899L

#define	flattening (1 / 298.257223563)

#define	semimajor 6378137.0

#define	semiminor ((1 - flattening) * semimajor)

Functions
double	vincenty_distance (double lat1, double lon1, double lat2, double lon2)

Macro Definition Documentation

◆ flattening

#define flattening (1 / 298.257223563)

Definition at line 24 of file vincenty.c.

◆ pi

#define pi 3.14159265358979323846264338327950288419716939937510582097494459230781640628620899L

Definition at line 23 of file vincenty.c.

◆ semimajor

#define semimajor 6378137.0

Definition at line 25 of file vincenty.c.

◆ semiminor

#define semiminor ((1 - flattening) * semimajor)

Definition at line 26 of file vincenty.c.

◆ USE_HELMERTS

#define USE_HELMERTS 1

Use Helmert's expansion something-or-other.

https://en.wikipedia.org/wiki/Vincenty's_formulae#Vincenty.27s_modification

Definition at line 20 of file vincenty.c.

◆ VINCENTY_MAX_LOOP

#define VINCENTY_MAX_LOOP 1e3

Used to prevent infinite loops caused by non-convergence.

Definition at line 12 of file vincenty.c.

◆ VINCENTY_TOLERANCE

#define VINCENTY_TOLERANCE 1e-12

Used to control the accuracy requirement. 1e−12 corresponds to approximately 0.06mm.

Definition at line 7 of file vincenty.c.

Function Documentation

◆ vincenty_distance()

double vincenty_distance	(	double	lat1,
		double	lon1,
		double	lat2,
		double	lon2
	)

Calculate geographical distances using Vincenty's algorithm.

Parameters

[in]	lat1	Latitude, in degrees, of first point.
[in]	lon1	Longitude, in degrees, of first point.
[in]	lat2	Latitude, in degrees, of second point.
[in]	lon2	Longitude, in degrees, of second point.
[out]	meters	Distance between the two points, in meters.

Returns: 0 on success.

Definition at line 47 of file vincenty.c.

Macros

Functions