gives the azimuthal direction from one latitude-longitude position on the Earth to another.
gives the azimuthal direction between locations specified by position objects or geographic entities.
- Geo direction is also known as azimuth or bearing.
- GeoDirection[loc1,loc2] gives the clockwise angle measured at loc1 between true north and the geodesic from loc1 to loc2. Heights are ignored.
- The result is returned as a Quantity angle with "AngularDegrees" unit.
- Latitudes and longitudes can be given as numbers in degrees, as DMS strings, or as Quantity angles.
- Position objects in GeoDirection[loc1,loc2] can be given as GeoPosition, GeoPositionXYZ, GeoPositionENU, or GeoGridPosition objects.
- GeoDirection[loc1,loc2] by default uses the reference ellipsoid associated with the datum for loc1.
- GeoDirection and GeoDistance solve the geodetic inverse problem.
Examplesopen allclose all
Basic Examples (2)
Azimuth angle between any two points on the Earth, using the parameters of the default datum "ITRF00":
Angles can also be specified as DMS strings:
Direction between geodetic positions, in different formats:
Height and time information is ignored in GeoDirection computations:
Direction between points in different datums. The computation is performed after changing the datum of the second point to the datum of the first:
Properties & Relations (8)
GeoDirection is not a symmetric function:
GeoDirection is a partial inverse of GeoDestination:
GeoDirection returns part of the information returned by GeoDisplacement:
Compute bearings between a list of points:
Construct points on a geodesic circle, starting with regular bearings:
Azimuths between points of the circle increase, modulo angle determination:
Construct multiple points along a geodesic, at regular distance intervals:
Bearing does not stay constant along a geodesic:
GeoDirection is not a smooth function for nearly antipodal points:
Compare with the corresponding results on the surface of a sphere:
Initial bearings of geodesics connecting antipodal pairs of points are complementary:
Wolfram Research (2008), GeoDirection, Wolfram Language function, https://reference.wolfram.com/language/ref/GeoDirection.html (updated 2014).
Wolfram Language. 2008. "GeoDirection." Wolfram Language & System Documentation Center. Wolfram Research. Last Modified 2014. https://reference.wolfram.com/language/ref/GeoDirection.html.
Wolfram Language. (2008). GeoDirection. Wolfram Language & System Documentation Center. Retrieved from https://reference.wolfram.com/language/ref/GeoDirection.html