Class Geodesy

java.lang.Object

org.episteme.natural.earth.geodesy.Geodesy

public class Geodesy
extends Object

Geodetic calculations for Earth science.

Provides:

• Haversine formula for great-circle distance
• Vincenty formula for high-accuracy geodesic distance
• Bearing calculations
• Destination point given bearing and distance

Since:

1.0

Author:

Silvere Martin-Michiellot, Gemini AI (Google DeepMind)

Field Summary

Fields

Modifier and Type	Field	Description
static final Real	EARTH_RADIUS_EQUATORIAL	WGS84 Earth equatorial radius (meters)
static final Real	EARTH_RADIUS_POLAR	WGS84 Earth polar radius (meters)
static final Real	FLATTENING	WGS84 flattening

Method Summary

Modifier and Type	Method	Description
static Real[]	destination(Real lat, Real lon, Real bearingDegrees, Real distanceM)	Destination point given start, bearing, and distance.
static Quantity<Length>	haversineDistance(Real lat1, Real lon1, Real lat2, Real lon2)	Haversine formula for great-circle distance.
static Real	initialBearing(Real lat1, Real lon1, Real lat2, Real lon2)	Initial bearing from point 1 to point 2.
static Real[]	midpoint(Real lat1, Real lon1, Real lat2, Real lon2)	Midpoint between two coordinates.
static Real	pressureRatio(Real altitudeM)	Barometric formula for atmospheric pressure at altitude.

Methods inherited from class Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Field Details

EARTH_RADIUS_EQUATORIAL

public static final Real EARTH_RADIUS_EQUATORIAL

WGS84 Earth equatorial radius (meters)

EARTH_RADIUS_POLAR

public static final Real EARTH_RADIUS_POLAR

WGS84 Earth polar radius (meters)

FLATTENING

public static final Real FLATTENING

WGS84 flattening

Method Details

haversineDistance

public static Quantity<Length> haversineDistance(Real lat1,
 Real lon1,
 Real lat2,
 Real lon2)

Haversine formula for great-circle distance. Simple and fast, accuracy ~0.5%

initialBearing

public static Real initialBearing(Real lat1,
 Real lon1,
 Real lat2,
 Real lon2)

Initial bearing from point 1 to point 2.

Returns:

bearing in degrees (0-360)

destination

public static Real[] destination(Real lat,
 Real lon,
 Real bearingDegrees,
 Real distanceM)

Destination point given start, bearing, and distance.

Returns:

Real[] with [lat, lon] of destination

midpoint

public static Real[] midpoint(Real lat1,
 Real lon1,
 Real lat2,
 Real lon2)

Midpoint between two coordinates.

Returns:

Real[] with [lat, lon] of midpoint

pressureRatio

public static Real pressureRatio(Real altitudeM)

Barometric formula for atmospheric pressure at altitude. P = P0 * exp(-Mgh/RT)

Returns:

pressure ratio P/P0