Package pygeodesy :: Module ellipsoids :: Class a_f2Tuple |
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# Class a_f2Tuple

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

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

Note: abs(f) < EPS is forced to f = 0, spherical.

See Also: Class Ellipsoid2.

Instance Methods
Inherited from `named._NamedTuple`: `__delattr__`, `__getattr__`, `__getitem__`, `__repr__`, `__setattr__`, `__str__`, `items`, `iteritems`, `iterunits`, `toRepr`, `toStr`, `toStr2`, `toUnits`, `units` Inherited from `tuple`: `__add__`, `__contains__`, `__eq__`, `__ge__`, `__getattribute__`, `__getnewargs__`, `__getslice__`, `__gt__`, `__hash__`, `__iter__`, `__le__`, `__len__`, `__lt__`, `__mul__`, `__ne__`, `__rmul__`, `count`, `index` Inherited from `named._Named`: `_dot_`, `attrs`, `classof`, `copy` 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) New a_f2Tuple ellipsoid specification. |

Class Variables
| _Names_ = ``(``'``a``'``,` `'``f``'``)`` Tuple specifying the `name` of each -Tuple item.
| _Units_ = `_Pass, _Pass` Tuple defining the `units` of the value of each -Tuple item.

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

Method Details

### __new__ (cls, a, f) Static Method |
New a_f2Tuple ellipsoid specification. Arguments: `a` - Equatorial (major) radius (`scalar` > 0). `f` - Flattening (`scalar` < 1). 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.

Class Variable Details

  ### _Names_ Tuple specifying the `name` of each -Tuple item. Note: Specify at least 2 item names. Value:
      ('a', 'f')

  ### _Units_ Tuple defining the `units` of the value of each -Tuple item. Note: The `len(_Units_)` must match `len(_Names_)`. Value:
      _Pass, _Pass

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: immutable(inst, value) - Throws an `AttributeError`, always.

### f_ Get the inverse flattening (`float`), 1 / f == a / (a - b). Get method: f_(self) - Get the inverse flattening (`float`), 1 / f == a / (a - b). Set method: immutable(inst, value) - Throws an `AttributeError`, always.