pygeodesy :: ellipsoids :: Ellipsoid :: Class Ellipsoid

Class Ellipsoid

  object --+            
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named._Named --+        
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named._NamedBase --+    
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named._NamedEnumItem --+
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                      Ellipsoid

Ellipsoid with equatorial and polar radii, flattening, inverse flattening and other, often used, cached attributes, supporting oblate and prolate ellipsoidal and spherical earth models.

Instance Methods

Llat(self, lat)
Return the meridional length, the distance along a meridian between the equator and a (geodetic) latitude, see L.

Lmeridian(self, lat)
Return the meridional length, the distance along a meridian between the equator and a (geodetic) latitude, see L.

Rgeocentric(self, lat)
Compute the geocentric earth radius of (geodetic) latitude.

Rlat(self, lat)
Average the earth radius between equatoradius at 0 and polaradius at +/-90 degrees latitude.

__eq__(self, other)
Compare this and an other ellipsoid.

__hash__(self)
hash(x)

__init__(self, a, b=None, f_=None, f=None, **name)
New Ellipsoid from the equatorial radius and either the polar radius or inverse flattening or flattening.

auxAuthalic(self, lat, inverse=False)
Compute the authalic auxiliary latitude (Xi) or the inverse thereof.

auxConformal(self, lat, inverse=False)
Compute the conformal auxiliary latitude (Chi) or the inverse thereof.

auxGeocentric(self, lat, inverse=False, height=0.0)
Compute the geocentric auxiliary latitude (Theta) or the inverse thereof.

auxIsometric(self, lat, inverse=False)
Compute the isometric auxiliary latitude (Psi) or the inverse thereof.

auxParametric(self, lat, inverse=False)
Compute the parametric auxiliary latitude (Beta) or the inverse thereof.

auxRectifying(self, lat, inverse=False)
Compute the rectifying auxiliary latitude (Mu) or the inverse thereof.

auxReduced(self, lat, inverse=False)
Compute the parametric auxiliary latitude (Beta) or the inverse thereof.

circle4(self, lat)
Get the equatorial or a parallel circle of latitude.

degrees2m(self, deg, lat=0)
Convert an arc in degrees to a distance along the equator or along a parallel of (geodetic) latitude.

distance2(self, lat0, lon0, lat1, lon1)
Approximate the distance and (initial) bearing between two points based on the local, flat earth approximation aka Hubeny formula.

e2s(self, s)
Compute norm sqrt(1 - e2 * s**2).

e2s2(self, s)
Compute 1 - e2 * s**2.

ecef(self, Ecef=None)
Return ECEF converter.

es_atanh(self, x)
Compute es * atanh(es * x) or -es * atan(es * x) for oblate respectively prolate ellipsoids where es is the signed (1st) eccentricity.

es_tauf(self, taup)
Compute Karney's equations (19), (20) and (21).

es_taupf(self, tau)
Compute Karney's equations (7), (8) and (9).

geodesic_(self, exact=True)
Get the an exact Geodesic... instance for this ellipsoid.

hartzell4(self, pov, los=None)
Compute the intersection of this ellipsoid's surface and a Line-Of-Sight from a Point-Of-View in space.

height4(self, xyz, normal=True)
Compute the projection on and the height of a cartesian above or below this ellipsoid's surface.

m2degrees(self, distance, lat=0)
Convert a distance to an arc in degrees along the equator or along a parallel of (geodetic) latitude.

m2radians(self, distance, lat=0)
Convert a distance to an angle along the equator or along a parallel of (geodetic) latitude.

radians2m(self, rad, lat=0)
Convert an angle to the distance along the equator or along a parallel of (geodetic) latitude.

rhumb_(self, exact=True)
Get the an exact Rhumb... instance for this ellipsoid.

roc1_(self, sa, ca=None)
Compute the prime-vertical, normal radius of curvature of (geodetic) latitude, unscaled.

roc2(self, lat, scaled=False)
Compute the meridional and prime-vertical, normal radii of curvature of (geodetic) latitude.

roc2_(self, phi, scaled=False)
Compute the meridional and prime-vertical, normal radii of curvature of (geodetic) latitude.

rocAzimuth(self, lat, azimuth)
Compute the directional radius of curvature of (geodetic) latitude and azimuth compass direction.

rocBearing(self, lat, bearing)
Compute the directional radius of curvature of (geodetic) latitude and bearing compass direction.

rocGauss(self, lat)
Compute the Gaussian radius of curvature of (geodetic) latitude.

rocMean(self, lat)
Compute the mean radius of curvature of (geodetic) latitude.

rocMeridional(self, lat)
Compute the meridional radius of curvature of (geodetic) latitude.

rocPrimeVertical(self, lat)
Compute the prime-vertical, normal radius of curvature of (geodetic) latitude, aka the transverse radius of curvature.

rocTransverse(self, lat)
Compute the prime-vertical, normal radius of curvature of (geodetic) latitude, aka the transverse radius of curvature.

toEllipse(self, **name)
Get this ellipsoid's meridional ellipse Ellipse.

toEllipsoid2(self, **name)
Get a copy of this ellipsoid as an Ellipsoid2.

toStr(self, prec=8, terse=4, **sep_name)
Return this ellipsoid as a text string.

toTriaxial(self, **name)
Convert this ellipsoid to a Triaxial_.

Inherited from named._NamedEnumItem: unregister

Inherited from named._NamedBase: __repr__, __str__, others, toRepr

Inherited from named._Named: __format__, __imatmul__, __matmul__, __rmatmul__, attrs, classof, copy, dup, methodname, rename, renamed, toStr2

Inherited from object: __delattr__, __getattribute__, __new__, __reduce__, __reduce_ex__, __setattr__, __sizeof__, __subclasshook__

Properties
	A
	AlphaKs
	BetaKs
	KsOrder Class `property` with a `.name` attribute.
	L
	R1
	R2
	R2x
	R3
	Rauthalic
	Rauthalicx
	Rbiaxial
	Requatorial
	Rgeometric
	Rmean
	Rpolar
	Rquadratic
	Rr
	Rrectifying
	Rs
	Rtriaxial
	Rvolumetric
	a
	a2
	a2_
	a2_b
	a2_b2
	a_b
	a_f
	a_f2
	area
	areax
	b
	b2
	b2_a
	b2_a2
	b_a
	c
	c2
	c2x
	e
	e12
	e2
	e21
	e22
	e22abs
	e2abs
	e32
	e32abs
	e4
	eccentricity
	eccentricity1st2
	eccentricity2nd2
	eccentricity3rd2
	equatoradius
	equatorimeter
	es
	es_c
	f
	f1
	f2
	f_
	flattening
	flattening1st
	flattening2nd
	flattening3rd
	geodesic
	geodesicw
	geodesicx
	geodsolve Get this ellipsoid's `GeodesicSolve`, the wrapper around utility GeodSolve, provided the path to the `GeodSolve` executable is specified with env variable `PYGEODESY_GEODSOLVE` or re-/set with this property..
	isEllipsoidal
	isOblate
	isProlate
	isSpherical
	majoradius
	minoradius
	n
	polaradius
	polarimeter
	quarteradius
	rhumbaux
	rhumbekx
	rhumbsolve Get this ellipsoid's `RhumbSolve`, the wrapper around utility RhumbSolve, provided the path to the `RhumbSolve` executable is specified with env variable `PYGEODESY_RHUMBSOLVE` or re-/set with this property.
	rhumbx
	rocEquatorial2
	rocPolar
	volume
Inherited from `named._NamedEnumItem`: `name` Inherited from `named._Named`: `classname`, `classnaming`, `iteration`, `named`, `named2`, `named3`, `named4`, `sizeof`, `typename` Inherited from `object`: `__class__`

Method Details

Llat(self, lat)

Return the meridional length, the distance along a meridian between the equator and a (geodetic) latitude, see L.

Parameters:

lat - Geodetic latitude (degrees90).

Returns:

The meridional length at lat, negative on southern hemisphere (meter).

Lmeridian(self, lat)

Return the meridional length, the distance along a meridian between the equator and a (geodetic) latitude, see L.

Parameters:

lat - Geodetic latitude (degrees90).

Returns:

The meridional length at lat, negative on southern hemisphere (meter).

Rgeocentric(self, lat)

Compute the geocentric earth radius of (geodetic) latitude.

Parameters:

lat - Latitude (degrees90).

Returns:

Geocentric earth radius (meter).

Raises:

ValueError - Invalid lat.

See Also: Geocentric Radius

Rlat(self, lat)

Average the earth radius between equatoradius at 0 and polaradius at +/-90 degrees latitude.

Parameters:

lat - Latitude (degrees90, str or Ang).

Returns:

Averaged earth radius (meter).

Raises:

RangeError - Latitude lat outside valid range, only if rangerrors is True.
TypeError - Invalid lat.
ValueError - Invalid lat.

eq(self, other)
(Equality operator)

Compare this and an other ellipsoid.

Parameters:

other - The other ellipsoid (Ellipsoid or Ellipsoid2).

Returns:

True if equal, False otherwise.

hash(self)
(Hashing function)

hash(x)

Overrides: object.__hash__: (inherited documentation)

init(self, a, b=None, f_=None, f=None, **name)
(Constructor)

New Ellipsoid from the equatorial radius and either the polar radius or inverse flattening or flattening.

Parameters:

a - Equatorial radius, semi-axis (meter).
b - Optional polar radius, semi-axis (meter).
f_ - Inverse flattening: a / (a - b) (float >>> 1.0).
f - Flattening: (a - b) / a (scalar, near zero for spherical).
name - Optional, unique name=NN (str).

Raises:

NameError - Ellipsoid with the same name already exists.
ValueError - Invalid a, b, f_ or f or f_ and f are incompatible.

Overrides: object.__init__

Note: abs(f_) > 1 / EPS or abs(1 / f_) < EPS is forced to 1 / f_ = 0, spherical.

auxAuthalic(self, lat, inverse=False)

Compute the authalic auxiliary latitude (Xi) or the inverse thereof.

Parameters:

lat - The geodetic (or authalic) latitude (degrees90).
inverse - If True, lat is the authalic and return the geodetic latitude (bool).

Returns:

The authalic (or geodetic) latitude in degrees90.

See Also: Inverse-/AuthalicLatitude, Authalic latitude, and Snyder, p 16.

auxConformal(self, lat, inverse=False)

Compute the conformal auxiliary latitude (Chi) or the inverse thereof.

Parameters:

lat - The geodetic (or conformal) latitude (degrees90).
inverse - If True, lat is the conformal and return the geodetic latitude (bool).

Returns:

The conformal (or geodetic) latitude in degrees90.

See Also: Inverse-/ConformalLatitude, Conformal latitude, and Snyder, pp 15-16.

auxGeocentric(self, lat, inverse=False, height=0.0)

Compute the geocentric auxiliary latitude (Theta) or the inverse thereof.

Parameters:

lat - The geodetic (or geocentric) latitude (degrees90).
inverse - If True, lat is the geocentric and return the geocentric latitude (bool).
height - Optional, ellipsoidal height (meter).

Returns:

The geocentric (or geodetic) latitude in degrees90.

See Also: Inverse-/GeocentricLatitude, Geocentric latitude, and Snyder, pp 17-18.

auxIsometric(self, lat, inverse=False)

Compute the isometric auxiliary latitude (Psi) or the inverse thereof.

Parameters:

lat - The geodetic (or isometric) latitude (degrees).
inverse - If True, lat is the isometric and return the geodetic latitude (bool).

Returns:

The isometric (or geodetic) latitude in degrees.

Note: The isometric latitude for geodetic +/-90 is far outside the [-90..+90] range but the inverse thereof is the original geodetic latitude.

See Also: Inverse-/IsometricLatitude, Isometric latitude, and Snyder, pp 15-16.

auxParametric(self, lat, inverse=False)

Compute the parametric auxiliary latitude (Beta) or the inverse thereof.

Parameters:

lat - The geodetic (or parametric) latitude (degrees90).
inverse - If True, lat is the parametric and return the geodetic latitude (bool).

Returns:

The parametric (or geodetic) latitude in degrees90.

See Also: Inverse-/ParametricLatitude, Parametric latitude, and Snyder, p 18.

auxRectifying(self, lat, inverse=False)

Compute the rectifying auxiliary latitude (Mu) or the inverse thereof.

Parameters:

lat - The geodetic (or rectifying) latitude (degrees90).
inverse - If True, lat is the rectifying and return the geodetic latitude (bool).

Returns:

The rectifying (or geodetic) latitude in degrees90.

See Also: Inverse-/RectifyingLatitude, Rectifying latitude, and Snyder, pp 16-17.

auxReduced(self, lat, inverse=False)

Compute the parametric auxiliary latitude (Beta) or the inverse thereof.

Parameters:

lat - The geodetic (or parametric) latitude (degrees90).
inverse - If True, lat is the parametric and return the geodetic latitude (bool).

Returns:

The parametric (or geodetic) latitude in degrees90.

See Also: Inverse-/ParametricLatitude, Parametric latitude, and Snyder, p 18.

circle4(self, lat)

Get the equatorial or a parallel circle of latitude.

Parameters:

lat - Geodetic latitude (degrees90 or str).

Returns:

A Circle4Tuple

(radius, height, 
          lat, beta)

Raises:

RangeError - Latitude lat outside valid range, only if rangerrors is True.
TypeError - Invalid lat.
ValueError - Invalid lat.

See Also: Definition of p and z under Parametric (or reduced) latitude, Karney's C++ CircleRadius and CircleHeight and method Triaxial.ellipse5.

degrees2m(self, deg, lat=0)

Convert an arc in degrees to a distance along the equator or along a parallel of (geodetic) latitude.

Parameters:

deg - The angle (degrees).
lat - Parallel latitude (degrees90, str).

Returns:

Distance (meter, same units as the equatorial and polar radii) or 0 for near-polar lat.

Raises:

RangeError - Latitude lat outside valid range and rangerrors is True.
ValueError - Invalid deg or lat.

distance2(self, lat0, lon0, lat1, lon1)

Approximate the distance and (initial) bearing between two points based on the local, flat earth approximation aka Hubeny formula.

Suitable only for distances of several hundred Km or Miles and only between points not near-polar.

Parameters:

lat0 - From latitude (degrees).
lon0 - From longitude (degrees).
lat1 - To latitude (degrees).
lon1 - To longitude (degrees).

Returns:

A Distance2Tuple

(distance, 
          initial)

with distance in same units as this ellipsoid's axes.

Note: The meridional and prime_vertical radii of curvature are taken and scaled at the initial latitude, see roc2.

See Also: Function pygeodesy.flatLocal/pygeodesy.hubeny.

e2s(self, s)

Compute norm sqrt(1 - e2 * s**2).

Parameters:

s - Sine value (scalar).

Returns:

Norm (float).

Raises:

ValueError - Invalid s.

e2s2(self, s)

Compute 1 - e2 * s**2.

Parameters:

s - Sine value (scalar).

Returns:

Result (float).

Raises:

ValueError - Invalid s.

ecef(self, Ecef=None)

Return ECEF converter.

Parameters:

Ecef - ECEF class to use, default EcefKarney.

Returns:

An ECEF converter for this ellipsoid.

Raises:

TypeError - Invalid Ecef.

See Also: Module pygeodesy.ecef.

es_atanh(self, x)

Compute es * atanh(es * x) or -es * atan(es * x) for oblate respectively prolate ellipsoids where es is the signed (1st) eccentricity.

Raises:

ValueError - Invalid x.

See Also: Function Math::eatanhe.

es_tauf(self, taup)

Compute Karney's equations (19), (20) and (21).

See Also: Karney's C++ method Math::tauf and and Veness' JavaScript method toLatLon.

es_taupf(self, tau)

Compute Karney's equations (7), (8) and (9).

See Also: Karney's C++ method Math::taupf.

geodesic_(self, exact=True)

Get the an exact Geodesic... instance for this ellipsoid.

Parameters:

exact - If bool return GeodesicExact(exact=exact, ...), otherwise a Geodesic, GeodesicExact or GeodesicSolve instance for this ellipsoid.

Returns:

The exact geodesic (Geodesic...).

Raises:

TypeError - Invalid exact.
ValueError - Incompatible exact ellipsoid.

hartzell4(self, pov, los=None)

Compute the intersection of this ellipsoid's surface and a Line-Of-Sight from a Point-Of-View in space.

Parameters:

pov - Point-Of-View outside this ellipsoid (Cartesian, Ecef9Tuple or Vector3d).
los - Line-Of-Sight, direction to this ellipsoid (Los, Vector3d) or True for the normal, perpendicular, plumb to the surface of this ellipsoid or False or None to point to its center.

Returns:

Vector4Tuple(x, y, z, h) with the cartesian coordinates x, y and z of the projection on or the intersection with this ellipsoid and the distance h from pov to (x, y, z) along los, all in meter, conventionally.

Raises:

IntersectionError - Null pov or los vector, or pov is inside this ellipsoid or los points outside this ellipsoid or in opposite direction.
TypeError - Invalid pov or los.

See Also: Satellite Line-of-Sight Intersection with Earth and methods Ellipsoid.height4 and Triaxial.hartzell4.

height4(self, xyz, normal=True)

Compute the projection on and the height of a cartesian above or below this ellipsoid's surface.

Parameters:

xyz - The cartesian (Cartesian, Ecef9Tuple, Vector3d, Vector3Tuple or Vector4Tuple).
normal - If True, the projection is perpendicular to (the nearest point on) this ellipsoid's surface, otherwise the radial line to this ellipsoid's center (bool).

Returns:

Vector4Tuple(x, y, z, h) with the cartesian coordinates x, y and z of the projection on and the height h above or below this ellipsoid's surface, all in meter, conventionally.

Raises:

ValueError - Null xyz.
TypeError - Non-cartesian xyz.

See Also: Distance to and intersection with an ellipse and methods Ellipsoid.hartzell4 and Triaxial.height4.

m2degrees(self, distance, lat=0)

Convert a distance to an arc in degrees along the equator or along a parallel of (geodetic) latitude.

Parameters:

distance - Distance (meter).
lat - Parallel latitude (degrees90, str).

Returns:

Angle (degrees) or 0 for near-polar lat.

Raises:

RangeError - Latitude lat outside valid range and rangerrors is True.
ValueError - Invalid distance or lat.

m2radians(self, distance, lat=0)

Convert a distance to an angle along the equator or along a parallel of (geodetic) latitude.

Parameters:

distance - Distance (meter).
lat - Parallel latitude (degrees90, str).

Returns:

Angle (radians) or INF for near-polar lat.

Raises:

RangeError - Latitude lat outside valid range and rangerrors is True.
ValueError - Invalid distance or lat.

radians2m(self, rad, lat=0)

Convert an angle to the distance along the equator or along a parallel of (geodetic) latitude.

Parameters:

rad - The angle (radians).
lat - Parallel latitude (degrees90, str).

Returns:

Distance (meter, same units as the equatorial and polar radii) or 0 for near-polar lat.

Raises:

RangeError - Latitude lat outside valid range and rangerrors is True.
ValueError - Invalid rad or lat.

rhumb_(self, exact=True)

Get the an exact Rhumb... instance for this ellipsoid.

Parameters:

exact - If bool or None return Rhumb(exact=exact, ...), otherwise a Rhumb, RhumbAux or RhumbSolve instance for this ellipsoid.

Returns:

The exact rhumb (Rhumb...).

Raises:

TypeError - Invalid exact.
ValueError - Incompatible exact ellipsoid.

roc1_(self, sa, ca=None)

Compute the prime-vertical, normal radius of curvature of (geodetic) latitude, unscaled.

Parameters:

sa - Sine of the latitude (float, [-1.0..+1.0]).
ca - Optional cosine of the latitude (float, [-1.0..+1.0]) to use an alternate formula.

Returns:

The prime-vertical radius of curvature (float).

Note: The delta between both formulae with Ellipsoids.WGS84 is less than 2 nanometer over the entire latitude range.

See Also: Method roc2_ and class EcefYou.

roc2(self, lat, scaled=False)

Compute the meridional and prime-vertical, normal radii of curvature of (geodetic) latitude.

Parameters:

lat - Latitude (degrees90).
scaled - Scale prime_vertical by cos(radians(lat)) (bool).

Returns:

An Curvature2Tuple

(meridional, 
          prime_vertical)

with the radii of curvature.

Raises:

ValueError - Invalid lat.

See Also: Methods roc2_ and roc1_, Local, flat earth approximation and meridional and prime vertical Radii of Curvature.

roc2_(self, phi, scaled=False)

Compute the meridional and prime-vertical, normal radii of curvature of (geodetic) latitude.

Parameters:

phi - Latitude (radians).
scaled - Scale prime_vertical by cos(phi) (bool).

Returns:

An Curvature2Tuple

(meridional, 
          prime_vertical)

with the radii of curvature.

Raises:

ValueError - Invalid phi.

See Also: Methods roc2 and roc1_, property rocEquatorial2, Local, flat earth approximation and the meridional and prime vertical Radii of Curvature.

rocAzimuth(self, lat, azimuth)

Compute the directional radius of curvature of (geodetic) latitude and azimuth compass direction.

See Also: Method rocBearing for details, using azimuth for bearing.

rocBearing(self, lat, bearing)

Compute the directional radius of curvature of (geodetic) latitude and bearing compass direction.

Parameters:

lat - Latitude (degrees90).
bearing - Direction (compass degrees360).

Returns:

Directional radius of curvature (meter).

Raises:

RangeError - Latitude lat outside valid range and rangerrors is True.
ValueError - Invalid lat or bearing.

See Also: Radii of Curvature

rocGauss(self, lat)

Compute the Gaussian radius of curvature of (geodetic) latitude.

Parameters:

lat - Latitude (degrees90).

Returns:

Gaussian radius of curvature (meter).

Raises:

ValueError - Invalid lat.

See Also: Non-directional Radii of Curvature

rocMean(self, lat)

Compute the mean radius of curvature of (geodetic) latitude.

Parameters:

lat - Latitude (degrees90).

Returns:

Mean radius of curvature (meter).

Raises:

ValueError - Invalid lat.

See Also: Non-directional Radii of Curvature

rocMeridional(self, lat)

Compute the meridional radius of curvature of (geodetic) latitude.

Parameters:

lat - Latitude (degrees90).

Returns:

Meridional radius of curvature (meter).

Raises:

ValueError - Invalid lat.

See Also: Methods roc2 and roc2_, Local, flat earth approximation and Radii of Curvature.

rocPrimeVertical(self, lat)

Compute the prime-vertical, normal radius of curvature of (geodetic) latitude, aka the transverse radius of curvature.

Parameters:

lat - Latitude (degrees90).

Returns:

Prime-vertical radius of curvature (meter).

Raises:

ValueError - Invalid lat.

See Also: Methods roc2, roc2_ and roc1_, Local, flat earth approximation and Radii of Curvature.

rocTransverse(self, lat)

Compute the prime-vertical, normal radius of curvature of (geodetic) latitude, aka the transverse radius of curvature.

Parameters:

lat - Latitude (degrees90).

Returns:

Prime-vertical radius of curvature (meter).

Raises:

ValueError - Invalid lat.

See Also: Methods roc2, roc2_ and roc1_, Local, flat earth approximation and Radii of Curvature.

toEllipse(self, **name)

Get this ellipsoid's meridional ellipse Ellipse.

Parameters:

name - Optional, unique name=NN (str).

toEllipsoid2(self, **name)

Get a copy of this ellipsoid as an Ellipsoid2.

Parameters:

name - Optional, unique name=NN (str).

See Also: Property a_f.

toStr(self, prec=8, terse=4, **sep_name)

Return this ellipsoid as a text string.

Parameters:

prec - Number of decimal digits, unstripped (int).
terse - Limit the number of items (int, 0...18), use terse=0 or =None for all.
sep_name - Optional name=NN (str) or None to exclude this ellipsoid's name and separator sep=", " to join the items (str).

Returns:

This Ellipsoid's attributes (str).

Overrides: named._Named.toStr

toTriaxial(self, **name)

Convert this ellipsoid to a Triaxial_.

Parameters:

name - Optional name=NN (str).

Returns:

A Triaxial_ or Triaxial with the X axis pointing east and Z pointing north.

See Also: Method Triaxial_.toEllipsoid.

Property Details

A

Get Method:: unreachable._fget(inst) - Get and cache/memoize the property value.
Set Method:: unreachable._fset_error(inst, val) - Throws an AttributeError, always.
Delete Method:: unreachable._fdel(inst) - Zap the cached/memoized property value.

AlphaKs

Get Method:: unreachable._fget(inst) - Get and cache/memoize the property value.
Set Method:: unreachable._fset_error(inst, val) - Throws an AttributeError, always.
Delete Method:: unreachable._fdel(inst) - Zap the cached/memoized property value.

BetaKs

Get Method:: unreachable._fget(inst) - Get and cache/memoize the property value.
Set Method:: unreachable._fset_error(inst, val) - Throws an AttributeError, always.
Delete Method:: unreachable._fdel(inst) - Zap the cached/memoized property value.

KsOrder

Class property with a .name attribute.

Get Method:: unreachable.KsOrder(self) - Get the Krüger series' order (int 4, 6 or 8).
Set Method:: unreachable.KsOrder(self, order) - Set the Krüger series' order (int 4, 6 or 8).

L

Get Method:: unreachable._fget(inst) - Get and cache/memoize the property value.
Set Method:: unreachable._fset_error(inst, val) - Throws an AttributeError, always.
Delete Method:: unreachable._fdel(inst) - Zap the cached/memoized property value.

R1

Get Method:: unreachable._fget(inst) - Get and cache/memoize the property value.
Set Method:: unreachable._fset_error(inst, val) - Throws an AttributeError, always.
Delete Method:: unreachable._fdel(inst) - Zap the cached/memoized property value.

R2

Get Method:: unreachable._fget(inst) - Get and cache/memoize the property value.
Set Method:: unreachable._fset_error(inst, val) - Throws an AttributeError, always.
Delete Method:: unreachable._fdel(inst) - Zap the cached/memoized property value.

R2x

Get Method:: unreachable._fget(inst) - Get and cache/memoize the property value.
Set Method:: unreachable._fset_error(inst, val) - Throws an AttributeError, always.
Delete Method:: unreachable._fdel(inst) - Zap the cached/memoized property value.

R3

Get Method:: unreachable._fget(inst) - Get and cache/memoize the property value.
Set Method:: unreachable._fset_error(inst, val) - Throws an AttributeError, always.
Delete Method:: unreachable._fdel(inst) - Zap the cached/memoized property value.

Rauthalic

Get Method:: unreachable._fget(inst) - Get and cache/memoize the property value.
Set Method:: unreachable._fset_error(inst, val) - Throws an AttributeError, always.
Delete Method:: unreachable._fdel(inst) - Zap the cached/memoized property value.

Rauthalicx

Get Method:: unreachable._fget(inst) - Get and cache/memoize the property value.
Set Method:: unreachable._fset_error(inst, val) - Throws an AttributeError, always.
Delete Method:: unreachable._fdel(inst) - Zap the cached/memoized property value.

Rbiaxial

Get Method:: unreachable._fget(inst) - Get and cache/memoize the property value.
Set Method:: unreachable._fset_error(inst, val) - Throws an AttributeError, always.
Delete Method:: unreachable._fdel(inst) - Zap the cached/memoized property value.

Requatorial

Get Method:: unreachable._fget(inst) - Get and cache/memoize the property value.
Set Method:: unreachable._fset_error(inst, val) - Throws an AttributeError, always.
Delete Method:: unreachable._fdel(inst) - Zap the cached/memoized property value.

Rgeometric

Get Method:: unreachable._fget(inst) - Get and cache/memoize the property value.
Set Method:: unreachable._fset_error(inst, val) - Throws an AttributeError, always.
Delete Method:: unreachable._fdel(inst) - Zap the cached/memoized property value.

Rmean

Get Method:: unreachable._fget(inst) - Get and cache/memoize the property value.
Set Method:: unreachable._fset_error(inst, val) - Throws an AttributeError, always.
Delete Method:: unreachable._fdel(inst) - Zap the cached/memoized property value.

Rpolar

Get Method:: unreachable._fget(inst) - Get and cache/memoize the property value.
Set Method:: unreachable._fset_error(inst, val) - Throws an AttributeError, always.
Delete Method:: unreachable._fdel(inst) - Zap the cached/memoized property value.

Rquadratic

Get Method:: unreachable._fget(inst) - Get and cache/memoize the property value.
Set Method:: unreachable._fset_error(inst, val) - Throws an AttributeError, always.
Delete Method:: unreachable._fdel(inst) - Zap the cached/memoized property value.

Rr

Get Method:: unreachable._fget(inst) - Get and cache/memoize the property value.
Set Method:: unreachable._fset_error(inst, val) - Throws an AttributeError, always.
Delete Method:: unreachable._fdel(inst) - Zap the cached/memoized property value.

Rrectifying

Get Method:: unreachable._fget(inst) - Get and cache/memoize the property value.
Set Method:: unreachable._fset_error(inst, val) - Throws an AttributeError, always.
Delete Method:: unreachable._fdel(inst) - Zap the cached/memoized property value.

Rs

Get Method:: unreachable._fget(inst) - Get and cache/memoize the property value.
Set Method:: unreachable._fset_error(inst, val) - Throws an AttributeError, always.
Delete Method:: unreachable._fdel(inst) - Zap the cached/memoized property value.

Rtriaxial

Get Method:: unreachable._fget(inst) - Get and cache/memoize the property value.
Set Method:: unreachable._fset_error(inst, val) - Throws an AttributeError, always.
Delete Method:: unreachable._fdel(inst) - Zap the cached/memoized property value.

Rvolumetric

Get Method:: unreachable._fget(inst) - Get and cache/memoize the property value.
Set Method:: unreachable._fset_error(inst, val) - Throws an AttributeError, always.
Delete Method:: unreachable._fdel(inst) - Zap the cached/memoized property value.

a

Get Method:: unreachable._fget(inst) - Get and cache/memoize the property value.
Set Method:: unreachable._fset_error(inst, val) - Throws an AttributeError, always.
Delete Method:: unreachable._fdel(inst) - Zap the cached/memoized property value.

a2

Get Method:: unreachable._fget(inst) - Get and cache/memoize the property value.
Set Method:: unreachable._fset_error(inst, val) - Throws an AttributeError, always.
Delete Method:: unreachable._fdel(inst) - Zap the cached/memoized property value.

a2_

Get Method:: unreachable._fget(inst) - Get and cache/memoize the property value.
Set Method:: unreachable._fset_error(inst, val) - Throws an AttributeError, always.
Delete Method:: unreachable._fdel(inst) - Zap the cached/memoized property value.

a2_b

Get Method:: unreachable._fget(inst) - Get and cache/memoize the property value.
Set Method:: unreachable._fset_error(inst, val) - Throws an AttributeError, always.
Delete Method:: unreachable._fdel(inst) - Zap the cached/memoized property value.

a2_b2

Get Method:: unreachable._fget(inst) - Get and cache/memoize the property value.
Set Method:: unreachable._fset_error(inst, val) - Throws an AttributeError, always.
Delete Method:: unreachable._fdel(inst) - Zap the cached/memoized property value.

a_b

Get Method:: unreachable._fget(inst) - Get and cache/memoize the property value.
Set Method:: unreachable._fset_error(inst, val) - Throws an AttributeError, always.
Delete Method:: unreachable._fdel(inst) - Zap the cached/memoized property value.

a_f

Get Method:: unreachable._fget(inst) - Get and cache/memoize the property value.
Set Method:: unreachable._fset_error(inst, val) - Throws an AttributeError, always.
Delete Method:: unreachable._fdel(inst) - Zap the cached/memoized property value.

a_f2

Get Method:: unreachable._fget(inst) - Get and cache/memoize the property value.
Set Method:: unreachable._fset_error(inst, val) - Throws an AttributeError, always.
Delete Method:: unreachable._fdel(inst) - Zap the cached/memoized property value.

area

Get Method:: unreachable._fget(inst) - Get and cache/memoize the property value.
Set Method:: unreachable._fset_error(inst, val) - Throws an AttributeError, always.
Delete Method:: unreachable._fdel(inst) - Zap the cached/memoized property value.

areax

Get Method:: unreachable._fget(inst) - Get and cache/memoize the property value.
Set Method:: unreachable._fset_error(inst, val) - Throws an AttributeError, always.
Delete Method:: unreachable._fdel(inst) - Zap the cached/memoized property value.

b

Get Method:: unreachable._fget(inst) - Get and cache/memoize the property value.
Set Method:: unreachable._fset_error(inst, val) - Throws an AttributeError, always.
Delete Method:: unreachable._fdel(inst) - Zap the cached/memoized property value.

b2

Get Method:: unreachable._fget(inst) - Get and cache/memoize the property value.
Set Method:: unreachable._fset_error(inst, val) - Throws an AttributeError, always.
Delete Method:: unreachable._fdel(inst) - Zap the cached/memoized property value.

b2_a

Get Method:: unreachable._fget(inst) - Get and cache/memoize the property value.
Set Method:: unreachable._fset_error(inst, val) - Throws an AttributeError, always.
Delete Method:: unreachable._fdel(inst) - Zap the cached/memoized property value.

b2_a2

Get Method:: unreachable._fget(inst) - Get and cache/memoize the property value.
Set Method:: unreachable._fset_error(inst, val) - Throws an AttributeError, always.
Delete Method:: unreachable._fdel(inst) - Zap the cached/memoized property value.

b_a

Get Method:: unreachable._fget(inst) - Get and cache/memoize the property value.
Set Method:: unreachable._fset_error(inst, val) - Throws an AttributeError, always.
Delete Method:: unreachable._fdel(inst) - Zap the cached/memoized property value.

c

Get Method:: unreachable._fget(inst) - Get and cache/memoize the property value.
Set Method:: unreachable._fset_error(inst, val) - Throws an AttributeError, always.
Delete Method:: unreachable._fdel(inst) - Zap the cached/memoized property value.

c2

Get Method:: unreachable._fget(inst) - Get and cache/memoize the property value.
Set Method:: unreachable._fset_error(inst, val) - Throws an AttributeError, always.
Delete Method:: unreachable._fdel(inst) - Zap the cached/memoized property value.

c2x

Get Method:: unreachable._fget(inst) - Get and cache/memoize the property value.
Set Method:: unreachable._fset_error(inst, val) - Throws an AttributeError, always.
Delete Method:: unreachable._fdel(inst) - Zap the cached/memoized property value.

e

Get Method:: unreachable._fget(inst) - Get and cache/memoize the property value.
Set Method:: unreachable._fset_error(inst, val) - Throws an AttributeError, always.
Delete Method:: unreachable._fdel(inst) - Zap the cached/memoized property value.

e12

Get Method:: unreachable._fget(inst) - Get and cache/memoize the property value.
Set Method:: unreachable._fset_error(inst, val) - Throws an AttributeError, always.
Delete Method:: unreachable._fdel(inst) - Zap the cached/memoized property value.

e2

Get Method:: unreachable._fget(inst) - Get and cache/memoize the property value.
Set Method:: unreachable._fset_error(inst, val) - Throws an AttributeError, always.
Delete Method:: unreachable._fdel(inst) - Zap the cached/memoized property value.

e21

Get Method:: unreachable._fget(inst) - Get and cache/memoize the property value.
Set Method:: unreachable._fset_error(inst, val) - Throws an AttributeError, always.
Delete Method:: unreachable._fdel(inst) - Zap the cached/memoized property value.

e22

Get Method:: unreachable._fget(inst) - Get and cache/memoize the property value.
Set Method:: unreachable._fset_error(inst, val) - Throws an AttributeError, always.
Delete Method:: unreachable._fdel(inst) - Zap the cached/memoized property value.

e22abs

Get Method:: unreachable._fget(inst) - Get and cache/memoize the property value.
Set Method:: unreachable._fset_error(inst, val) - Throws an AttributeError, always.
Delete Method:: unreachable._fdel(inst) - Zap the cached/memoized property value.

e2abs

Get Method:: unreachable._fget(inst) - Get and cache/memoize the property value.
Set Method:: unreachable._fset_error(inst, val) - Throws an AttributeError, always.
Delete Method:: unreachable._fdel(inst) - Zap the cached/memoized property value.

e32

Get Method:: unreachable._fget(inst) - Get and cache/memoize the property value.
Set Method:: unreachable._fset_error(inst, val) - Throws an AttributeError, always.
Delete Method:: unreachable._fdel(inst) - Zap the cached/memoized property value.

e32abs

Get Method:: unreachable._fget(inst) - Get and cache/memoize the property value.
Set Method:: unreachable._fset_error(inst, val) - Throws an AttributeError, always.
Delete Method:: unreachable._fdel(inst) - Zap the cached/memoized property value.

e4

Get Method:: unreachable._fget(inst) - Get and cache/memoize the property value.
Set Method:: unreachable._fset_error(inst, val) - Throws an AttributeError, always.
Delete Method:: unreachable._fdel(inst) - Zap the cached/memoized property value.

eccentricity

Get Method:: unreachable._fget(inst) - Get and cache/memoize the property value.
Set Method:: unreachable._fset_error(inst, val) - Throws an AttributeError, always.
Delete Method:: unreachable._fdel(inst) - Zap the cached/memoized property value.

eccentricity1st2

Get Method:: unreachable._fget(inst) - Get and cache/memoize the property value.
Set Method:: unreachable._fset_error(inst, val) - Throws an AttributeError, always.
Delete Method:: unreachable._fdel(inst) - Zap the cached/memoized property value.

eccentricity2nd2

Get Method:: unreachable._fget(inst) - Get and cache/memoize the property value.
Set Method:: unreachable._fset_error(inst, val) - Throws an AttributeError, always.
Delete Method:: unreachable._fdel(inst) - Zap the cached/memoized property value.

eccentricity3rd2

Get Method:: unreachable._fget(inst) - Get and cache/memoize the property value.
Set Method:: unreachable._fset_error(inst, val) - Throws an AttributeError, always.
Delete Method:: unreachable._fdel(inst) - Zap the cached/memoized property value.

equatoradius

Get Method:: unreachable._fget(inst) - Get and cache/memoize the property value.
Set Method:: unreachable._fset_error(inst, val) - Throws an AttributeError, always.
Delete Method:: unreachable._fdel(inst) - Zap the cached/memoized property value.

equatorimeter

Get Method:: unreachable._fget(inst) - Get and cache/memoize the property value.
Set Method:: unreachable._fset_error(inst, val) - Throws an AttributeError, always.
Delete Method:: unreachable._fdel(inst) - Zap the cached/memoized property value.

es

Get Method:: unreachable._fget(inst) - Get and cache/memoize the property value.
Set Method:: unreachable._fset_error(inst, val) - Throws an AttributeError, always.
Delete Method:: unreachable._fdel(inst) - Zap the cached/memoized property value.

es_c

Get Method:: unreachable._fget(inst) - Get and cache/memoize the property value.
Set Method:: unreachable._fset_error(inst, val) - Throws an AttributeError, always.
Delete Method:: unreachable._fdel(inst) - Zap the cached/memoized property value.

f

Get Method:: unreachable._fget(inst) - Get and cache/memoize the property value.
Set Method:: unreachable._fset_error(inst, val) - Throws an AttributeError, always.
Delete Method:: unreachable._fdel(inst) - Zap the cached/memoized property value.

f1

Get Method:: unreachable._fget(inst) - Get and cache/memoize the property value.
Set Method:: unreachable._fset_error(inst, val) - Throws an AttributeError, always.
Delete Method:: unreachable._fdel(inst) - Zap the cached/memoized property value.

f2

Get Method:: unreachable._fget(inst) - Get and cache/memoize the property value.
Set Method:: unreachable._fset_error(inst, val) - Throws an AttributeError, always.
Delete Method:: unreachable._fdel(inst) - Zap the cached/memoized property value.

f_

Get Method:: unreachable._fget(inst) - Get and cache/memoize the property value.
Set Method:: unreachable._fset_error(inst, val) - Throws an AttributeError, always.
Delete Method:: unreachable._fdel(inst) - Zap the cached/memoized property value.

flattening

Get Method:: unreachable._fget(inst) - Get and cache/memoize the property value.
Set Method:: unreachable._fset_error(inst, val) - Throws an AttributeError, always.
Delete Method:: unreachable._fdel(inst) - Zap the cached/memoized property value.

flattening1st

Get Method:: unreachable._fget(inst) - Get and cache/memoize the property value.
Set Method:: unreachable._fset_error(inst, val) - Throws an AttributeError, always.
Delete Method:: unreachable._fdel(inst) - Zap the cached/memoized property value.

flattening2nd

Get Method:: unreachable._fget(inst) - Get and cache/memoize the property value.
Set Method:: unreachable._fset_error(inst, val) - Throws an AttributeError, always.
Delete Method:: unreachable._fdel(inst) - Zap the cached/memoized property value.

flattening3rd

Get Method:: unreachable._fget(inst) - Get and cache/memoize the property value.
Set Method:: unreachable._fset_error(inst, val) - Throws an AttributeError, always.
Delete Method:: unreachable._fdel(inst) - Zap the cached/memoized property value.

geodesic

Get Method:: unreachable._fget(inst) - Get and cache/memoize the property value.
Set Method:: unreachable._fset_error(inst, val) - Throws an AttributeError, always.
Delete Method:: unreachable._fdel(inst) - Zap the cached/memoized property value.

geodesicw

Get Method:: unreachable.geodesicw(self) - Get this ellipsoid's wrapped geodesicw.Geodesic, provided Karney's geographiclib package is installed.
Set Method:: unreachable._fset_error(inst, val) - Throws an AttributeError, always.
Delete Method:: unreachable._fdel(inst) - Zap the cached/memoized property value.

geodesicx

Get Method:: unreachable.geodesicx(self) - Get this ellipsoid's exact GeodesicExact.
Set Method:: unreachable._fset_error(inst, val) - Throws an AttributeError, always.
Delete Method:: unreachable._fdel(inst) - Zap the cached/memoized property value.

geodsolve

Get this ellipsoid's GeodesicSolve, the wrapper around utility GeodSolve, provided the path to the GeodSolve executable is specified with env variable PYGEODESY_GEODSOLVE or re-/set with this property..

Get Method:: unreachable.geodsolve(self) - Get this ellipsoid's GeodesicSolve, the wrapper around utility GeodSolve, provided the path to the GeodSolve executable is specified with env variable PYGEODESY_GEODSOLVE or re-/set with this property..
Set Method:: unreachable.geodsolve(self, path) - Re-/set the (fully qualified) path to the GeodSolve executable, overriding env variable PYGEODESY_GEODSOLVE (str).

isEllipsoidal

Get Method:: unreachable._fget(inst) - Get and cache/memoize the property value.
Set Method:: unreachable._fset_error(inst, val) - Throws an AttributeError, always.
Delete Method:: unreachable._fdel(inst) - Zap the cached/memoized property value.

isOblate

Get Method:: unreachable._fget(inst) - Get and cache/memoize the property value.
Set Method:: unreachable._fset_error(inst, val) - Throws an AttributeError, always.
Delete Method:: unreachable._fdel(inst) - Zap the cached/memoized property value.

isProlate

Get Method:: unreachable._fget(inst) - Get and cache/memoize the property value.
Set Method:: unreachable._fset_error(inst, val) - Throws an AttributeError, always.
Delete Method:: unreachable._fdel(inst) - Zap the cached/memoized property value.

isSpherical

Get Method:: unreachable._fget(inst) - Get and cache/memoize the property value.
Set Method:: unreachable._fset_error(inst, val) - Throws an AttributeError, always.
Delete Method:: unreachable._fdel(inst) - Zap the cached/memoized property value.

majoradius

Get Method:: unreachable._fget(inst) - Get and cache/memoize the property value.
Set Method:: unreachable._fset_error(inst, val) - Throws an AttributeError, always.
Delete Method:: unreachable._fdel(inst) - Zap the cached/memoized property value.

minoradius

Get Method:: unreachable._fget(inst) - Get and cache/memoize the property value.
Set Method:: unreachable._fset_error(inst, val) - Throws an AttributeError, always.
Delete Method:: unreachable._fdel(inst) - Zap the cached/memoized property value.

n

Get Method:: unreachable._fget(inst) - Get and cache/memoize the property value.
Set Method:: unreachable._fset_error(inst, val) - Throws an AttributeError, always.
Delete Method:: unreachable._fdel(inst) - Zap the cached/memoized property value.

polaradius

Get Method:: unreachable._fget(inst) - Get and cache/memoize the property value.
Set Method:: unreachable._fset_error(inst, val) - Throws an AttributeError, always.
Delete Method:: unreachable._fdel(inst) - Zap the cached/memoized property value.

polarimeter

Get Method:: unreachable.polarimeter(self) - Get the ellipsoid's polar, meridional perimeter (meter).
Set Method:: unreachable._fset_error(inst, val) - Throws an AttributeError, always.
Delete Method:: unreachable._fdel(inst) - Zap the cached/memoized property value.

quarteradius

Get Method:: unreachable._fget(inst) - Get and cache/memoize the property value.
Set Method:: unreachable._fset_error(inst, val) - Throws an AttributeError, always.
Delete Method:: unreachable._fdel(inst) - Zap the cached/memoized property value.

rhumbaux

Get Method:: unreachable.rhumbaux(self) - Get this ellipsoid's Auxiliary rhumb.RhumbAux.
Set Method:: unreachable._fset_error(inst, val) - Throws an AttributeError, always.
Delete Method:: unreachable._fdel(inst) - Zap the cached/memoized property value.

rhumbekx

Get Method:: unreachable.rhumbekx(self) - Get this ellipsoid's Elliptic, Krüger rhumb.Rhumb.
Set Method:: unreachable._fset_error(inst, val) - Throws an AttributeError, always.
Delete Method:: unreachable._fdel(inst) - Zap the cached/memoized property value.

rhumbsolve

Get this ellipsoid's RhumbSolve, the wrapper around utility RhumbSolve, provided the path to the RhumbSolve executable is specified with env variable PYGEODESY_RHUMBSOLVE or re-/set with this property.

Get Method:: unreachable.rhumbsolve(self) - Get this ellipsoid's RhumbSolve, the wrapper around utility RhumbSolve, provided the path to the RhumbSolve executable is specified with env variable PYGEODESY_RHUMBSOLVE or re-/set with this property.
Set Method:: unreachable.rhumbsolve(self, path) - Re-/set the (fully qualified) path to the RhumbSolve executable, overriding env variable PYGEODESY_RHUMBSOLVE (str).

rhumbx

Get Method:: unreachable.rhumbx(self) - DEPRECATED on 2023.11.28, use property rhumbekx.
Set Method:: unreachable._fset_error(inst, val) - Throws an AttributeError, always.
Delete Method:: unreachable._fdel(inst) - Zap the cached/memoized property value.

rocEquatorial2

Get Method:: unreachable._fget(inst) - Get and cache/memoize the property value.
Set Method:: unreachable._fset_error(inst, val) - Throws an AttributeError, always.
Delete Method:: unreachable._fdel(inst) - Zap the cached/memoized property value.

rocPolar

Get Method:: unreachable._fget(inst) - Get and cache/memoize the property value.
Set Method:: unreachable._fset_error(inst, val) - Throws an AttributeError, always.
Delete Method:: unreachable._fdel(inst) - Zap the cached/memoized property value.

volume

Get Method:: unreachable._fget(inst) - Get and cache/memoize the property value.
Set Method:: unreachable._fset_error(inst, val) - Throws an AttributeError, always.
Delete Method:: unreachable._fdel(inst) - Zap the cached/memoized property value.

Class Ellipsoid

Llat(self, lat)

Lmeridian(self, lat)

Rgeocentric(self, lat)

Rlat(self, lat)

__eq__(self, other) (Equality operator)

__hash__(self) (Hashing function)

__init__(self, a, b=None, f_=None, f=None, **name) (Constructor)

auxAuthalic(self, lat, inverse=False)

auxConformal(self, lat, inverse=False)

auxGeocentric(self, lat, inverse=False, height=0.0)

auxIsometric(self, lat, inverse=False)

auxParametric(self, lat, inverse=False)

auxRectifying(self, lat, inverse=False)

auxReduced(self, lat, inverse=False)

circle4(self, lat)

degrees2m(self, deg, lat=0)

distance2(self, lat0, lon0, lat1, lon1)

e2s(self, s)

e2s2(self, s)

ecef(self, Ecef=None)

es_atanh(self, x)

es_tauf(self, taup)

es_taupf(self, tau)

geodesic_(self, exact=True)

hartzell4(self, pov, los=None)

height4(self, xyz, normal=True)

m2degrees(self, distance, lat=0)

m2radians(self, distance, lat=0)

radians2m(self, rad, lat=0)

rhumb_(self, exact=True)

roc1_(self, sa, ca=None)

roc2(self, lat, scaled=False)

roc2_(self, phi, scaled=False)

rocAzimuth(self, lat, azimuth)

rocBearing(self, lat, bearing)

rocGauss(self, lat)

rocMean(self, lat)

rocMeridional(self, lat)

rocPrimeVertical(self, lat)

rocTransverse(self, lat)

toEllipse(self, **name)

toEllipsoid2(self, **name)

toStr(self, prec=8, terse=4, **sep_name)

toTriaxial(self, **name)

A

AlphaKs

BetaKs

KsOrder

L

R1

R2

R2x

R3

Rauthalic

Rauthalicx

Rbiaxial

Requatorial

Rgeometric

Rmean

Rpolar

Rquadratic

Rr

Rrectifying

Rs

Rtriaxial

Rvolumetric

a

a2

a2_

a2_b

a2_b2

a_b

a_f

a_f2

area

areax

b

b2

b2_a

eq(self, other)
(Equality operator)

hash(self)
(Hashing function)

init(self, a, b=None, f_=None, f=None, **name)
(Constructor)