Package pygeodesy :: Module ellipsoids :: Class a_f2Tuple

Class a_f2Tuple

   object --+        
            |        
        tuple --+    
                |    
   object --+   |    
            |   |    
 named._Named --+    
                |    
named._NamedTuple --+
                    |
                   a_f2Tuple

2-Tuple (a, f) specifying an ellipsoid by equatorial radius a in meter and scalar flattening f.

See Also: Class Ellipsoid2.

Instance Methods

ellipsoid(self, name='')
Return an Ellipsoid for this 2-tuple (a, f).

Inherited from named._NamedTuple: __delattr__, __getattr__, __hash__, __repr__, __setattr__, __str__, dup, items, iteritems, iterunits, toRepr, toStr, toUnits, units

Inherited from tuple: __add__, __contains__, __eq__, __ge__, __getattribute__, __getitem__, __getnewargs__, __getslice__, __gt__, __iter__, __le__, __len__, __lt__, __mul__, __ne__, __rmul__, count, index

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

Inherited from object: __format__, __init__, __reduce__, __reduce_ex__, __sizeof__, __subclasshook__

Static Methods

a new object with type S, a subtype of T

__new__(cls, a, f, **name)
New a_f2Tuple ellipsoid specification.

Properties
	b Get the polar radius (`meter`), a (1 - f)*.
	f_ Get the inverse flattening (`scalar`), 1 / f == a / (a - b).
Inherited from `named._Named`: `classname`, `classnaming`, `iteration`, `name`, `named`, `named2`, `named3`, `named4`, `sizeof` Inherited from `object`: `__class__`

Method Details

new (cls, a, f, **name)
Static Method

New a_f2Tuple ellipsoid specification.

Arguments:

a - Equatorial radius (scalar > 0).
f - Flattening (scalar < 1, negative for prolate).
name - Optional name (str).

Returns: a new object with type S, a subtype of T

An a_f2Tuple(a, f) instance.

Raises:

UnitError - Invalid a or f.

Overrides: object.__new__

Note: abs(f) < EPS is forced to f=0, spherical. Negative f produces a prolate ellipsoid.

ellipsoid (self, name='')

Return an Ellipsoid for this 2-tuple (a, f).

Raises:

NameError - A registered ellipsoid with the same name already exists.

Property Details

b

Get the polar radius (meter), a * (1 - f).

Get method:: b(self) - Get the polar radius (meter), a * (1 - f).
Set method:: _fset_error(inst, val) - Throws an AttributeError, always.
Delete Method:: _fdel(inst) - Zap the cached/memoized property value.

f_

Get the inverse flattening (scalar), 1 / f == a / (a - b).

Get method:: f_(self) - Get the inverse flattening (scalar), 1 / f == a / (a - b).
Set method:: _fset_error(inst, val) - Throws an AttributeError, always.
Delete Method:: _fdel(inst) - Zap the cached/memoized property value.

Class a_f2Tuple

__new__ (cls, a, f, **name) Static Method

ellipsoid (self, name='')

b

f_

new (cls, a, f, **name)
Static Method