Geocentric Namespace Reference

Classes
class	Point3D
Functions
const double	get_orthodormic_angle (double lat1, double lon1, double lat2, double lon2)
	compute the angle in radians between 2 points P1 and P2 on a sphere, represented by their (latitude, longitude) coordinates Source : http://www.faqs.org/faqs/geography/infosystems-faq/ ; Q5.1 Uses the Haversine Formula (from R.W. Sinnott, "Virtues of the Haversine", Sky and Telescope, vol. 68, no. 2, 1984, p. 159):
const double	get_square_plane_dist (const double dlat, const double dlon)
	return the square plane distance between 2 points using their latitude and longitude difference
const double	get_square_plane_dist (const double lat1, const double lon1, const double lat2, const double lon2)
	return the square plane distance between 2 points using their latitudes and longitudes
const double	get_haversine_dist (double lat1, double lon1, double lat2, double lon2)
	compute the Haversine distance in km between 2 points P1 and P2 on the earth, represented by their (latitude, longitude) coordinates. Here, the earth is considered as an ideal sphere, using the authalic radius ("equal aera"), from http://en.wikipedia.org/wiki/Earth_radius Source : http://www.faqs.org/faqs/geography/infosystems-faq/ ; Q5.1 Uses the Haversine Formula (from R.W. Sinnott, "Virtues of the Haversine", Sky and Telescope, vol. 68, no. 2, 1984, p. 159):

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Detailed Description

(lat, lon, alt) system geometry kernel. Here the coordinates named as "Geocentric" are the (latitude in degrees, longitude in degrees, and altitude above sea level in meters)

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Function Documentation

const double Geocentric::get_haversine_dist	(	double	lat1,
		double	lon1,
		double	lat2,
		double	lon2
	)

compute the Haversine distance in km between 2 points P1 and P2 on the earth, represented by their (latitude, longitude) coordinates. Here, the earth is considered as an ideal sphere, using the authalic radius ("equal aera"), from http://en.wikipedia.org/wiki/Earth_radius Source : http://www.faqs.org/faqs/geography/infosystems-faq/ ; Q5.1 Uses the Haversine Formula (from R.W. Sinnott, "Virtues of the Haversine", Sky and Telescope, vol. 68, no. 2, 1984, p. 159):

Parameters:

	lat1	latitude of the 1st point, in degrees. In the range [ -90, 90 ]
	lon1	longitude of the 1st point, in degrees. In the range ] -180, 180 ]
	lat2	latitude of the 2nd point, in degrees. In the range [ -90, 90 ]
	lon2	longitude of the 2nd point, in degrees. In the range ] -180, 180 ]

Returns:

the Haversine distance between P1 and P2 in m

References get_orthodormic_angle(), and Earth::get_radius().

Referenced by MODISFileData::get_index(), and MODISFileData::get_nearest_point_distance().

const double Geocentric::get_orthodormic_angle	(	double	lat1,
		double	lon1,
		double	lat2,
		double	lon2
	)

compute the angle in radians between 2 points P1 and P2 on a sphere, represented by their (latitude, longitude) coordinates Source : http://www.faqs.org/faqs/geography/infosystems-faq/ ; Q5.1 Uses the Haversine Formula (from R.W. Sinnott, "Virtues of the Haversine", Sky and Telescope, vol. 68, no. 2, 1984, p. 159):

Parameters:

	lat1	latitude of the 1st point, in degrees. In the range [ -90, 90 ]
	lon1	longitude of the 1st point, in degrees. In the range ] -180, 180 ]
	lat2	latitude of the 2nd point, in degrees. In the range [ -90, 90 ]
	lon2	longitude of the 2nd point, in degrees. In the range ] -180, 180 ]

Returns:

the angle between P1 and P2 in radians

Referenced by get_haversine_dist().

const double Geocentric::get_square_plane_dist	(	const double	lat1,
		const double	lon1,
		const double	lat2,
		const double	lon2
	)

return the square plane distance between 2 points using their latitudes and longitudes

Parameters:

	lat1	latitude of the first point, in degrees. In the range [ -90, 90 ]
	lon1	longitude of the first point, in degrees. In the range ] -180, 180 ]
	lat2	latitude of the 2nd point, in degrees. In the range [ -90, 90 ]
	lon2	longitude of the 2nd point, in degrees. In the range ] -180, 180 ]

Returns:

the distance between the 2 points using the square plane approximation

References get_square_plane_dist().

const double Geocentric::get_square_plane_dist	(	const double	dlat,
		const double	dlon
	)

return the square plane distance between 2 points using their latitude and longitude difference

Parameters:

	dlat	latitude difference, in degrees. In the range [ -90, 90 ]
	dlon	longitude difference, in degrees. In the range ] -180, 180 ]

Returns:

the distance between the 2 points using the square plane approximation

Referenced by get_square_plane_dist().