Package pygeodesy :: Module etm :: Class ExactTransverseMercator

Class ExactTransverseMercator

  object --+        
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named._Named --+    
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named._NamedBase --+
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                  ExactTransverseMercator

Pure Python version of Karney's C++ class TransverseMercatorExact, a numerically exact transverse Mercator projection, further referred to as TMExact.

Instance Methods

__init__(self, datum=Datum(name='WGS84', ellipsoid=Ellipsoids.WGS84, transform=Tran..., lon0=0, k0=0.9996, extendp=False, raiser=False, **name)
New ExactTransverseMercator projection.

forward(self, lat, lon, lon0=None, jam=False, **name)
Forward projection, from geographic to transverse Mercator.

reset(self, lat0, lon0)
Set the central parallel and meridian.

reverse(self, x, y, lon0=None, jam=False, **name)
Reverse projection, from Transverse Mercator to geographic.

toStr(self, joined=', ', **kwds)
Return a str representation.

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

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

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

Properties
	datum Class `property` with a `.name` attribute.
	ellipsoid
	equatoradius
	a
	extendp
	flattening
	f
	iteration
	k0 Class `property` with a `.name` attribute.
	lon0 Class `property` with a `.name` attribute.
	majoradius
	raiser Class `property` with a `.name` attribute.
Inherited from `named._Named`: `classname`, `classnaming`, `name`, `named`, `named2`, `named3`, `named4`, `sizeof` Inherited from `object`: `__class__`

Method Details

init (self, datum=Datum(name='WGS84', ellipsoid=Ellipsoids.WGS84, transform=Tran`...`, lon0=0, k0=0.9996, extendp=False, raiser=False, **name)
(Constructor)

New ExactTransverseMercator projection.

Arguments:

datum - The non-spherical datum or ellipsoid (Datum, Ellipsoid, Ellipsoid2 or a_f2Tuple).
lon0 - Central meridian, default (degrees180).
k0 - Central scale factor (float).
extendp - Use the extended domain (bool), standard otherwise.
raiser - If True, throw an ETMError for convergence failures (bool).
name - Optional name=NN for the projection (str).

Raises:

ETMError - Near-spherical datum or ellipsoid or invalid lon0 or k0.

Overrides: object.__init__

See Also: Constructor TransverseMercatorExact for more details, especially on extendp.

Note: For all 255.5K TMcoords.dat tests (with 0 <= lat <= 84 and 0 <= lon) the maximum error is 5.2e-08 .forward (or 52 nano-meter) easting and northing and 3.8e-13 .reverse (or 0.38 pico-degrees) lat- and longitude (with Python 3.7.3+, 2.7.16+, PyPy6 3.5.3 and PyPy6 2.7.13, all in 64-bit on macOS 10.13.6 High Sierra x86_64 and 12.2 Monterey arm64 and "arm64_x86_64").

forward (self, lat, lon, lon0=None, jam=False, **name)

Forward projection, from geographic to transverse Mercator.

Arguments:

lat - Latitude of point (degrees).
lon - Longitude of point (degrees).
lon0 - Central meridian (degrees180), overriding the default if not None.
jam - If True, use the Jacobi amplitude otherwise Bulirsch' function (bool).
name - Optional name=NN (str).

Returns:

Forward4Tuple

(easting, northing, gamma, 
          scale)

Raises:

ETMError - No convergence, thrown iff property raiser=True.

See Also: void TMExact::Forward(real lon0, real lat, real lon, real &x, real &y, real &gamma, real &k).

reset (self, lat0, lon0)

Set the central parallel and meridian.

Arguments:

lat0 - Latitude of the central parallel (degrees90).
lon0 - Longitude of the central parallel (degrees180).

Returns:

2-Tuple (lat0, lon0) of the previous central parallel and meridian.

Raises:

ETMError - Invalid lat0 or lon0.

reverse (self, x, y, lon0=None, jam=False, **name)

Reverse projection, from Transverse Mercator to geographic.

Arguments:

x - Easting of point (meters).
y - Northing of point (meters).
lon0 - Optional central meridian (degrees180), overriding the default (iff not None).
jam - If True, use the Jacobi amplitude otherwise Bulirsch' function (bool).
name - Optional name=NN (str).

Returns:

Reverse4Tuple

(lat, lon, gamma, 
          scale)

Raises:

ETMError - No convergence, thrown iff property raiser=True.

See Also: void TMExact::Reverse(real lon0, real x, real y, real &lat, real &lon, real &gamma, real &k)

toStr (self, joined=', ', **kwds)

Return a str representation.

Arguments:

joined - Separator to join the attribute strings (str or None or NN for non-joined).
kwds - Optional, overriding keyword arguments.

Overrides: named._Named.toStr

Property Details

datum

Class property with a .name attribute.

Get method:: datum(self) - Get the datum (Datum) or None.
Set method:: datum(self, datum) - Set the datum and ellipsoid (Datum, Ellipsoid, Ellipsoid2 or a_f2Tuple).

ellipsoid

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

equatoradius

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 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.

extendp

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

flattening

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 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.

iteration

Get method:: iteration(self) - Get the most recent ExactTransverseMercator.forward or ExactTransverseMercator.reverse iteration number (int) or None if not available/applicable.
Set method:: _fset_error(inst, val) - Throws an AttributeError, always.
Delete Method:: _fdel(inst) - Zap the cached/memoized property value.

k0

Class property with a .name attribute.

Get method:: k0(self) - Get the central scale factor (float), aka scale0.
Set method:: k0(self, k0) - Set the central scale factor (float), aka scale0.

lon0

Class property with a .name attribute.

Get method:: lon0(self) - Get the central meridian (degrees180).
Set method:: lon0(self, lon0) - Set the central meridian (degrees180).

majoradius

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.

raiser

Class property with a .name attribute.

Get method:: raiser(self) - Get the error setting (bool).
Set method:: raiser(self, raiser) - Set the error setting (bool), if True throw an ETMError for convergence failures.

Class ExactTransverseMercator

__init__ (self, datum=Datum(name='WGS84', ellipsoid=Ellipsoids.WGS84, transform=Tran..., lon0=0, k0=0.9996, extendp=False, raiser=False, **name) (Constructor)

forward (self, lat, lon, lon0=None, jam=False, **name)

reset (self, lat0, lon0)

reverse (self, x, y, lon0=None, jam=False, **name)

toStr (self, joined=', ', **kwds)

datum

ellipsoid

equatoradius

a

extendp

flattening

f

iteration

k0

lon0

majoradius

raiser

init (self, datum=Datum(name='WGS84', ellipsoid=Ellipsoids.WGS84, transform=Tran`...`, lon0=0, k0=0.9996, extendp=False, raiser=False, **name)
(Constructor)