distance_ellipse()

double distance_ellipse	(	double	lat1,
		double	long1,
		double	lat2,
		double	long2,
		SPHEROID *	sphere
	)

Definition at line 207 of file lwgeom_spheroid.c.

{
        double result = 0;
#if POSTGIS_DEBUG_LEVEL >= 4
        double result2 = 0;
#endif
 
        if ( (lat1==lat2) && (long1 == long2) )
        {
                return 0.0; /* same point, therefore zero distance */
        }
 
        result = distance_ellipse_calculation(lat1,long1,lat2,long2,sphere);
 
#if POSTGIS_DEBUG_LEVEL >= 4
        result2 =  distance_sphere_method(lat1, long1,lat2,long2, sphere);
 
        POSTGIS_DEBUGF(4, "delta = %lf, skae says: %.15lf,2 circle says: %.15lf",
                 (result2-result),result,result2);
        POSTGIS_DEBUGF(4, "2 circle says: %.15lf",result2);
#endif
 
        if (result != result)  /* NaN check
                                                * (x==x for all x except NaN by IEEE definition)
                                                */
        {
                result =  distance_sphere_method(lat1, long1,
                                                 lat2,long2, sphere);
        }
 
        return result;
}

References distance_ellipse_calculation(), and distance_sphere_method().

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