Package pygeodesy :: Module ellipsoidalVincenty
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Module ellipsoidalVincenty

Ellipsoidal Thaddeus Vincenty's geodetic (lat-/longitude) LatLon, geocentric (ECEF) Cartesian and VincentyError classes and functions areaOf, intersections2, nearestOn and perimeterOf.

Pure Python implementation of geodesy tools for ellipsoidal earth models, transcribed from JavaScript originals by (C) Chris Veness 2005-2016 and published under the same MIT Licence**, see Vincenty geodesics. More at geographiclib and GeoPy.

Calculate geodesic distance between two points using the Vincenty formulae and one of several ellipsoidal earth models. The default model is WGS-84, the most accurate and widely used globally-applicable model for the earth ellipsoid.

Other ellipsoids offering a better fit to the local geoid include Airy (1830) in the UK, Clarke (1880) in Africa, International 1924 in much of Europe, and GRS-67 in South America. North America (NAD83) and Australia (GDA) use GRS-80, which is equivalent to the WGS-84 model.

Great-circle distance uses a spherical model of the earth with the mean earth radius defined by the International Union of Geodesy and Geophysics (IUGG) as (2 * a + b) / 3 = 6371008.7714150598 meter or approx. 6371009 meter (for WGS-84, resulting in an error of up to about 0.5%).

Here's an example usage of ellipsoidalVincenty:

>>> from pygeodesy.ellipsoidalVincenty import LatLon
>>> Newport_RI = LatLon(41.49008, -71.312796)
>>> Cleveland_OH = LatLon(41.499498, -81.695391)
>>> Newport_RI.distanceTo(Cleveland_OH)
866,455.4329158525  # meter

You can change the ellipsoid model used by the Vincenty formulae as follows:

>>> from pygeodesy import Datums
>>> from pygeodesy.ellipsoidalVincenty import LatLon
>>> p = LatLon(0, 0, datum=Datums.OSGB36)

or by converting to anothor datum:

>>> p = p.convertDatum(Datums.OSGB36)

Version: 21.01.07

Classes
  VincentyError
Error raised from Vincenty's direct and inverse methods for coincident points or lack of convergence.
  Cartesian
Extended to convert geocentric, Cartesian points to Vincenty-based, ellipsoidal, geodetic LatLon.
  LatLon
Using the formulae devised by Thaddeus Vincenty (1975) for an (oblate) ellipsoidal model of the earth to compute the geodesic distance and bearings between two given points or the destination point given an start point and (initial) bearing.
Functions
 
ispolar(points, wrap=False)
Check whether a polygon encloses a pole.
 
intersections2(center1, radius1, center2, radius2, height=None, wrap=True, equidistant=None, tol=0.001, LatLon=<class 'pygeodesy.ellipsoidalVincenty.LatLon'>, **LatLon_kwds)
Iteratively compute the intersection points of two circles each defined by an (ellipsoidal) center point and a radius.
 
nearestOn(point, point1, point2, within=True, height=None, wrap=False, equidistant=None, tol=0.001, LatLon=<class 'pygeodesy.ellipsoidalVincenty.LatLon'>, **LatLon_kwds)
Iteratively locate the closest point on the arc between two other points.
 
perimeterOf(points, closed=False, datum=Datum(name='WGS84', ellipsoid=Ellipsoids.WGS84, transform=Tran..., wrap=True)
DEPRECATED, use function ellipsoidalKarney.perimeterOf.
Variables
  __all__ = _ALL_LAZY.ellipsoidalVincenty
Function Details

ispolar (points, wrap=False)

 

Check whether a polygon encloses a pole.

Arguments:
  • points - The polygon points (LatLon[]).
  • wrap - Wrap and unroll longitudes (bool).
Returns:
True if the polygon encloses a pole, False otherwise.
Raises:
  • PointsError - Insufficient number of points
  • TypeError - Some points are not LatLon or don't have bearingTo2, initialBearingTo and finalBearingTo methods.

intersections2 (center1, radius1, center2, radius2, height=None, wrap=True, equidistant=None, tol=0.001, LatLon=<class 'pygeodesy.ellipsoidalVincenty.LatLon'>, **LatLon_kwds)

 

Iteratively compute the intersection points of two circles each defined by an (ellipsoidal) center point and a radius.

Arguments:
  • center1 - Center of the first circle (LatLon).
  • radius1 - Radius of the first circle (meter, conventionally).
  • center2 - Center of the second circle (LatLon).
  • radius2 - Radius of the second circle (meter, same units as radius2).
  • height - Optional height for the intersection points, overriding the "radical height" at the "radical line" between both centers (meter) or None.
  • wrap - Wrap and unroll longitudes (bool).
  • equidistant - An azimuthal equidistant projection (class EquidistantKarney or function equidistant), or None for Equidistant.
  • tol - Convergence tolerance (meter, same units as radius1 and radius2).
  • LatLon - Optional class to return the intersection points (LatLon) or None.
  • LatLon_kwds - Optional, additional LatLon keyword arguments, ignored if LatLon=None.
Returns:
2-Tuple of the intersection points, each a LatLon instance or LatLon4Tuple(lat, lon, height, datum) if LatLon is None. For abutting circles, both intersection points are the same instance.
Raises:
  • IntersectionError - Concentric, antipodal, invalid or non-intersecting circles or no convergence for the tol.
  • ImportError - Package geographiclib not installed or not found.
  • TypeError - Invalid or non-ellipsoidal center1 or center2 or invalid equidistant.
  • UnitError - Invalid radius1, radius2 or height.

See Also: The ellipsoidal case, Karney's paper, pp 20-21, section 14. MARITIME BOUNDARIES, circle-circle and sphere-sphere intersections.

nearestOn (point, point1, point2, within=True, height=None, wrap=False, equidistant=None, tol=0.001, LatLon=<class 'pygeodesy.ellipsoidalVincenty.LatLon'>, **LatLon_kwds)

 

Iteratively locate the closest point on the arc between two other points.

Arguments:
  • point - Reference point (LatLon).
  • point1 - Start point of the arc (LatLon).
  • point2 - End point of the arc (LatLon).
  • within - If True return the closest point between point1 and point2, otherwise the closest point elsewhere on the arc (bool).
  • height - Optional height for the closest point (meter) or None.
  • wrap - Wrap and unroll longitudes (bool).
  • equidistant - An azimuthal equidistant projection (class EquidistantKarney or function equidistant), or None for Equidistant.
  • tol - Convergence tolerance (meter).
  • LatLon - Optional class to return the closest point (LatLon) or None.
  • LatLon_kwds - Optional, additional LatLon keyword arguments, ignored if LatLon=None.
Returns:
Closest point (LatLon).
Raises:
  • ImportError - Package geographiclib not installed or not found.
  • TypeError - Invalid or non-ellipsoidal point, point1 or point2 or invalid equidistant.

perimeterOf (points, closed=False, datum=Datum(name='WGS84', ellipsoid=Ellipsoids.WGS84, transform=Tran..., wrap=True)

 

DEPRECATED, use function ellipsoidalKarney.perimeterOf.

Raises:
  • ImportError - Package geographiclib not installed or not found.