Package pygeodesy :: Module albers :: Class _AlbersBase

Class _AlbersBase

  object --+        
           |        
named._Named --+    
               |    
named._NamedBase --+
                   |
                  _AlbersBase

Known Subclasses:

(INTERNAL) Base class for AlbersEqualArea... projections.

See Also: Karney's C++ class AlbersEqualArea, method Init.

Instance Methods

__init__(self, sa1, ca1, sa2, ca2, k, datum, name)
(INTERNAL) New AlbersEqualArea... instance.

forward(self, lat, lon, lon0=0, name='')
Convert a geodetic location to east- and northing.

rescale0(self, lat, k=1)
Set the azimuthal scale for this projection.

reverse(self, x, y, lon0=0, name='', LatLon=None, **LatLon_kwds)
Convert an east- and northing location to geodetic lat- and longitude.

toRepr(self, prec=6, **unused)
Return a string representation of this projection.

toStr(self, prec=6, sep=' ', **unused)
Return a string representation of this projection.

Inherited from named._NamedBase: __repr__, __str__, others

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

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

Properties
	datum Get the datum (Datum).
	ellipsoid Get the datum's ellipsoid (Ellipsoid).
	equatoradius Get the `ellipsoid`'s equatorial radius, semi-axis (`meter`).
	a Get the `ellipsoid`'s equatorial radius, semi-axis (`meter`).
	flattening Get the `ellipsoid`'s flattening (`scalar`).
	f Get the `ellipsoid`'s flattening (`scalar`).
	ispolar Is this projection polar (`bool`)?
	isPolar Is this projection polar (`bool`)?
	lat0 Get the latitude of the projection origin (`degrees`).
	lat1 Get the latitude of the first parallel (`degrees`).
	lat2 Get the latitude of the second parallel (`degrees`).
	majoradius DEPRECATED, use property `equatoradius`.
	scale0 Get the central scale for the projection (`float`).
Inherited from `named._Named`: `classname`, `classnaming`, `iteration`, `name`, `named`, `named2`, `named3`, `named4`, `sizeof` Inherited from `object`: `__class__`

Method Details

init (self, sa1, ca1, sa2, ca2, k, datum, name)
(Constructor)

(INTERNAL) New AlbersEqualArea... instance.

Overrides: object.__init__

forward (self, lat, lon, lon0=0, name='')

Convert a geodetic location to east- and northing.

Arguments:

lat - Latitude of the location (degrees).
lon - Longitude of the location (degrees).
lon0 - Optional central meridian longitude (degrees).
name - Optional name for the location (str).

Returns:

An Albers7Tuple

(x, y, lat, lon, gamma, scale,
          datum)

, with lon offset by lon0 and reduced [-180,180].

Note: The origin latitude is returned by property lat0. No false easting or northing is added. The value of lat should be in the range [-90..90] degrees. The returned values x and y will be large but finite for points projecting to infinity, i.e. one or both of the poles.

rescale0 (self, lat, k=1)

Set the azimuthal scale for this projection.

Arguments:

lat - Northern latitude (degrees).
k - Azimuthal scale at latitude lat (scalar).

Raises:

AlbersError - Invalid lat or k.

Note: This allows a latitude of conformality to be specified.

reverse (self, x, y, lon0=0, name='', LatLon=None, **LatLon_kwds)

Convert an east- and northing location to geodetic lat- and longitude.

Arguments:

x - Easting of the location (meter).
y - Northing of the location (meter).
lon0 - Optional central meridian longitude (degrees).
name - Optional name for the location (str).
LatLon - Class to use (LatLon) or None.
LatLon_kwds - Optional, additional LatLon keyword arguments, ignored if LatLon is None.

Returns:

The geodetic (LatLon) or if LatLon is None an Albers7Tuple

(x, y, lat, lon, gamma, scale,
          datum)

Note: The origin latitude is returned by property lat0. No false easting or northing is added. The returned value of lon is in the range [-180..180] degrees and lat is in the range [-90..90] degrees. If the given x or y point is outside the valid projected space the nearest pole is returned.

toRepr (self, prec=6, **unused)

Return a string representation of this projection.

Arguments:

prec - Number of (decimal) digits, unstripped (int).

Returns:

This projection as

"<classname>(lat1, lat2, 
          ...)"

(str).

Overrides: named._Named.toRepr

toStr (self, prec=6, sep=' ', **unused)

Return a string representation of this projection.

Arguments:

prec - Number of (decimal) digits, unstripped (int).
sep - Separator to join (str).

Returns:

This projection as "lat1 lat2" (str).

Overrides: named._Named.toStr

Property Details

datum

Get the datum (Datum).

Get method:: datum(self) - Get the datum (Datum).
Set method:: _fset_error(inst, val) - Throws an AttributeError, always.
Delete Method:: _fdel(inst) - Zap the cached/memoized property value.

ellipsoid

Get the datum's ellipsoid (Ellipsoid).

Get method:: ellipsoid(self) - Get the datum's ellipsoid (Ellipsoid).
Set method:: _fset_error(inst, val) - Throws an AttributeError, always.
Delete Method:: _fdel(inst) - Zap the cached/memoized property value.

equatoradius

Get the ellipsoid's equatorial radius, semi-axis (meter).

Get method:: equatoradius(self) - Get the ellipsoid's equatorial radius, semi-axis (meter).
Set method:: _fset_error(inst, val) - Throws an AttributeError, always.
Delete Method:: _fdel(inst) - Zap the cached/memoized property value.

a

Get the ellipsoid's equatorial radius, semi-axis (meter).

Get method:: equatoradius(self) - Get the ellipsoid's equatorial radius, semi-axis (meter).
Set method:: _fset_error(inst, val) - Throws an AttributeError, always.
Delete Method:: _fdel(inst) - Zap the cached/memoized property value.

flattening

Get the ellipsoid's flattening (scalar).

Get method:: flattening(self) - Get the ellipsoid's flattening (scalar).
Set method:: _fset_error(inst, val) - Throws an AttributeError, always.
Delete Method:: _fdel(inst) - Zap the cached/memoized property value.

f

Get the ellipsoid's flattening (scalar).

Get method:: flattening(self) - Get the ellipsoid's flattening (scalar).
Set method:: _fset_error(inst, val) - Throws an AttributeError, always.
Delete Method:: _fdel(inst) - Zap the cached/memoized property value.

ispolar

Is this projection polar (bool)?

Get method:: ispolar(self) - Is this projection polar (bool)?
Set method:: _fset_error(inst, val) - Throws an AttributeError, always.
Delete Method:: _fdel(inst) - Zap the cached/memoized property value.

isPolar

Is this projection polar (bool)?

Get method:: ispolar(self) - Is this projection polar (bool)?
Set method:: _fset_error(inst, val) - Throws an AttributeError, always.
Delete Method:: _fdel(inst) - Zap the cached/memoized property value.

lat0

Get the latitude of the projection origin (degrees).

This is the latitude of minimum azimuthal scale and equals the lat in the 1-parallel AlbersEqualArea and lies between lat1 and lat2 for the 2-parallel AlbersEqualArea2 and AlbersEqualArea4 projections.

Get method:: lat0(self) - Get the latitude of the projection origin (degrees).
Set method:: _fset_error(inst, val) - Throws an AttributeError, always.
Delete Method:: _fdel(inst) - Zap the cached/memoized property value.

lat1

Get the latitude of the first parallel (degrees).

Get method:: lat1(self) - Get the latitude of the first parallel (degrees).
Set method:: _fset_error(inst, val) - Throws an AttributeError, always.
Delete Method:: _fdel(inst) - Zap the cached/memoized property value.

lat2

Get the latitude of the second parallel (degrees).

Get method:: lat2(self) - Get the latitude of the second parallel (degrees).
Set method:: _fset_error(inst, val) - Throws an AttributeError, always.
Delete Method:: _fdel(inst) - Zap the cached/memoized property value.

Note: The second and first parallel latitudes are the same instance for 1-parallel AlbersEqualArea* projections.

majoradius

DEPRECATED, use property equatoradius.

Get method:: majoradius(self) - DEPRECATED, use property equatoradius.
Set method:: _fset_error(inst, val) - Throws an AttributeError, always.
Delete Method:: _fdel(inst) - Zap the cached/memoized property value.

scale0

Get the central scale for the projection (float).

This is the azimuthal scale on the latitude of origin of the projection, see property lat0.

Get method:: scale0(self) - Get the central scale for the projection (float).
Set method:: _fset_error(inst, val) - Throws an AttributeError, always.
Delete Method:: _fdel(inst) - Zap the cached/memoized property value.

Class _AlbersBase

__init__ (self, sa1, ca1, sa2, ca2, k, datum, name) (Constructor)

forward (self, lat, lon, lon0=0, name='')

rescale0 (self, lat, k=1)

reverse (self, x, y, lon0=0, name='', LatLon=None, **LatLon_kwds)

toRepr (self, prec=6, **unused)

toStr (self, prec=6, sep=' ', **unused)

datum

ellipsoid

equatoradius

a

flattening

f

ispolar

isPolar

lat0

lat1

lat2

majoradius

scale0

init (self, sa1, ca1, sa2, ca2, k, datum, name)
(Constructor)