Consists of methods dealing with Earth geographic coordinates and locations. More...

#include "geographic-positions.h"

Public Types
enum	EarthSpheroidType { SPHERE , GRS80 , WGS84 }
	Spheroid model to use for earth: perfect sphere (SPHERE), Geodetic Reference System 1980 (GRS80), or World Geodetic System 1984 (WGS84) More...

Static Public Member Functions
static Vector	CartesianToGeographicCoordinates (Vector pos, EarthSpheroidType sphType)
	Inverse of GeographicToCartesianCoordinates using [1].

static Vector	GeographicToCartesianCoordinates (double latitude, double longitude, double altitude, EarthSpheroidType sphType)
	Converts earth geographic/geodetic coordinates (latitude and longitude in degrees) with a given altitude above earth's surface (in meters) to Earth Centered Earth Fixed (ECEF) Cartesian coordinates (x, y, z in meters), where origin (0, 0, 0) is the center of the earth.

static std::list< Vector >	RandCartesianPointsAroundGeographicPoint (double originLatitude, double originLongitude, double maxAltitude, int numPoints, double maxDistFromOrigin, Ptr< UniformRandomVariable > uniRand)
	Generates uniformly distributed random points (in ECEF Cartesian coordinates) within a given altitude above earth's surface centered around a given origin point (on earth's surface, in geographic/geodetic coordinates) within a given distance radius (using arc length of earth's surface, not pythagorean distance).

Detailed Description

Consists of methods dealing with Earth geographic coordinates and locations.

Definition at line 34 of file geographic-positions.h.

Member Enumeration Documentation

◆ EarthSpheroidType

enum ns3::GeographicPositions::EarthSpheroidType

Spheroid model to use for earth: perfect sphere (SPHERE), Geodetic Reference System 1980 (GRS80), or World Geodetic System 1984 (WGS84)

Moritz, H. "Geodetic Reference System 1980." GEODETIC REFERENCE SYSTEM 1980. https://web.archive.org/web/20170712034716/http://www.gfy.ku.dk/~iag/HB2000/part4/grs80_corr.htm.

"Department of Defense World Geodetic System 1984." National Imagery and Mapping Agency, 1 Jan. 2000. https://web.archive.org/web/20200729203634/https://earth-info.nga.mil/GandG/publications/tr8350.2/wgs84fin.pdf.

Enumerator
SPHERE
GRS80
WGS84

Definition at line 48 of file geographic-positions.h.

Member Function Documentation

◆ CartesianToGeographicCoordinates()

Vector ns3::GeographicPositions::CartesianToGeographicCoordinates	(	Vector	pos,
		EarthSpheroidType	sphType
	)

static

Inverse of GeographicToCartesianCoordinates using [1].

This function iteratively converts cartesian (ECEF) coordinates to geographic coordinates. The residual delta is 1 m, which is approximately 1 / 30 arc seconds or 9.26e-6 deg.

Parameters

pos	a vector containing the Cartesian coordinates (x, y, z referenced in meters) of the point (origin (0, 0, 0) is center of earth)
sphType	earth spheroid model to use for conversion

Returns: Vector position where x = latitude (deg), y = longitude (deg), z = altitude above the ellipsoid (m)

[1] "Ellipsoidal and Cartesian Coordinates Conversion", Navipedia, European Space Agency, Jul 8, 2019. https://gssc.esa.int/navipedia/index.php/Ellipsoidal_and_Cartesian_Coordinates_Conversion

Definition at line 97 of file geographic-positions.cc.

References ns3::CalculateDistance(), ns3::DEG2RAD, ns3::EARTH_GRS80_ECCENTRICITY, ns3::EARTH_RADIUS, ns3::EARTH_SEMIMAJOR_AXIS, ns3::EARTH_WGS84_ECCENTRICITY, GRS80, NS_ASSERT_MSG, NS_LOG_FUNCTION, ns3::RAD2DEG, and SPHERE.

Referenced by CartesianToGeoTestCase::DoRun().

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◆ GeographicToCartesianCoordinates()

Vector ns3::GeographicPositions::GeographicToCartesianCoordinates	(	double	latitude,
		double	longitude,
		double	altitude,
		EarthSpheroidType	sphType
	)

static

Converts earth geographic/geodetic coordinates (latitude and longitude in degrees) with a given altitude above earth's surface (in meters) to Earth Centered Earth Fixed (ECEF) Cartesian coordinates (x, y, z in meters), where origin (0, 0, 0) is the center of the earth.

Parameters

latitude	earth-referenced latitude (in degrees) of the point
longitude	earth-referenced longitude (in degrees) of the point
altitude	height of the point (in meters) above earth's surface
sphType	earth spheroid model to use for conversion

Returns: a vector containing the Cartesian coordinates (x, y, z referenced in meters) of the point (origin (0, 0, 0) is center of earth)

Definition at line 61 of file geographic-positions.cc.

References ns3::DEG2RAD, ns3::EARTH_GRS80_ECCENTRICITY, ns3::EARTH_RADIUS, ns3::EARTH_SEMIMAJOR_AXIS, ns3::EARTH_WGS84_ECCENTRICITY, GRS80, NS_LOG_FUNCTION_NOARGS, and SPHERE.

Referenced by GeoToCartesianTestCase::DoRun(), CartesianToGeoTestCase::DoRun(), RandCartAroundGeoTestCase::DoRun(), and RandCartesianPointsAroundGeographicPoint().

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◆ RandCartesianPointsAroundGeographicPoint()

std::list< Vector > ns3::GeographicPositions::RandCartesianPointsAroundGeographicPoint	(	double	originLatitude,
		double	originLongitude,
		double	maxAltitude,
		int	numPoints,
		double	maxDistFromOrigin,
		Ptr< UniformRandomVariable >	uniRand
	)

static

Generates uniformly distributed random points (in ECEF Cartesian coordinates) within a given altitude above earth's surface centered around a given origin point (on earth's surface, in geographic/geodetic coordinates) within a given distance radius (using arc length of earth's surface, not pythagorean distance).

Distance radius is measured as if all generated points are on earth's surface (with altitude = 0). Assumes earth is a perfect sphere.

Parameters

originLatitude	origin point latitude in degrees
originLongitude	origin point longitude in degrees
maxAltitude	maximum altitude in meters above earth's surface with which random points can be generated
numPoints	number of points to generate
maxDistFromOrigin	max distance in meters from origin with which random transmitters can be generated (all transmitters are less than or equal to this distance from the origin, relative to points being on earth's surface)
uniRand	pointer to the uniform random variable to use for random location and altitude generation