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# -*- coding: utf-8 -*- 

 

u'''Cassini-Soldner (CSS) projection. 

 

Classes L{CassiniSoldner}, L{Css} and L{CSSError} requiring I{Charles Karney}'s 

U{geographiclib <https://PyPI.org/project/geographiclib>} Python package to be 

installed. 

''' 

 

from pygeodesy.basics import neg, _umod_360, \ 

_xinstanceof, _xsubclassof 

from pygeodesy.datums import _ellipsoidal_datum, _WGS84 

from pygeodesy.ellipsoidalBase import LatLonEllipsoidalBase as _LLEB 

from pygeodesy.errors import _ValueError, _xdatum, _xellipsoidal, _xkwds 

from pygeodesy.interns import NN, _azimuth_, _COMMASPACE_, _datum_, \ 

_easting_, _lat_, _lon_, _m_, _name_, \ 

_northing_, _reciprocal_, _SPACE_, \ 

_0_0, _0_5, _90_0 

from pygeodesy.interns import _C_ # PYCHOK used! 

from pygeodesy.karney import _atan2d, _copysign, _diff182, \ 

_norm2, _norm180, _sincos2d 

from pygeodesy.lazily import _ALL_LAZY, _ALL_MODS as _MODS 

from pygeodesy.named import _NamedBase, _NamedTuple, nameof 

from pygeodesy.namedTuples import EasNor2Tuple, EasNor3Tuple, \ 

LatLon2Tuple, LatLon4Tuple, _LL4Tuple 

from pygeodesy.props import deprecated_Property_RO, Property, \ 

Property_RO, _update_all 

from pygeodesy.streprs import Fmt, _fstrENH2, _fstrLL0, _xzipairs 

from pygeodesy.units import Bearing, Degrees, Easting, Height, \ 

Lat_, Lon_, Northing, Scalar 

 

__all__ = _ALL_LAZY.css 

__version__ = '22.05.03' 

 

 

def _CS0(cs0): 

'''(INTERNAL) Get/set default projection. 

''' 

if cs0 is None: 

cs0 = Css._CS0 

if cs0 is None: 

Css._CS0 = cs0 = CassiniSoldner(_0_0, _0_0, name='Default') 

else: 

_xinstanceof(CassiniSoldner, cs0=cs0) 

return cs0 

 

 

class CSSError(_ValueError): 

'''Cassini-Soldner (CSS) conversion or other L{Css} issue. 

''' 

pass 

 

 

class CassiniSoldner(_NamedBase): 

'''Cassini-Soldner projection, a Python version of I{Karney}'s C++ class U{CassiniSoldner 

<https://GeographicLib.SourceForge.io/html/classGeographicLib_1_1CassiniSoldner.html>}. 

''' 

_cb0 = _0_0 

_datum = _WGS84 # L{Datum} 

_geodesic = None 

_latlon0 = () 

_meridian = None 

_sb0 = _0_0 

 

def __init__(self, lat0, lon0, datum=_WGS84, name=NN): 

'''New L{CassiniSoldner} projection. 

 

@arg lat0: Latitude of center point (C{degrees90}). 

@arg lon0: Longitude of center point (C{degrees180}). 

@kwarg datum: Optional datum or ellipsoid (L{Datum}, 

L{Ellipsoid}, L{Ellipsoid2} or L{a_f2Tuple}). 

@kwarg name: Optional name (C{str}). 

 

@raise CSSError: Invalid B{C{lat}} or B{C{lon}}. 

 

@example: 

 

>>> p = CassiniSoldner(48 + 50/60.0, 2 + 20/60.0) # Paris 

>>> p.forward(50.9, 1.8) # Calais 

(-37518.854545, 230003.561828) 

 

>>> p.reverse4(-38e3, 230e3) 

(50.899937, 1.793161, 89.580797, 0.999982) 

''' 

if datum not in (None, self._datum): 

self._datum = _xellipsoidal(datum=_ellipsoidal_datum(datum, name=name)) 

if name: 

self.name = name 

 

self.reset(lat0, lon0) 

 

@Property 

def datum(self): 

'''Get the datum (L{Datum}). 

''' 

return self._datum 

 

@datum.setter # PYCHOK setter! 

def datum(self, datum): 

'''Set the datum or ellipsoid (L{Datum}, L{Ellipsoid}, L{Ellipsoid2} 

or L{a_f2Tuple}) or C{None} for the default. 

''' 

d = CassiniSoldner._datum if datum is None else \ 

_xellipsoidal(datum=_ellipsoidal_datum(datum, name=self.name)) 

if self._datum != d: 

self._datum = d 

self.geodesic = None if self._geodesic is None else self.isExact 

 

def _datumatch(self, latlon): 

'''Check for matching datum ellipsoids. 

 

@raise CSSError: Ellipsoid mismatch of B{C{latlon}} and this projection. 

''' 

d = getattr(latlon, _datum_, None) 

if d: 

_xdatum(self.datum, d, Error=CSSError) 

 

@Property_RO 

def equatoradius(self): 

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

''' 

return self.geodesic.a 

 

@Property_RO 

def flattening(self): 

'''Get the ellipsoid's flattening (C{float}). 

''' 

return self.geodesic.f 

 

def forward(self, lat, lon, name=NN): 

'''Convert an (ellipsoidal) geodetic location to Cassini-Soldner 

easting and northing. 

 

@arg lat: Latitude of the location (C{degrees90}). 

@arg lon: Longitude of the location (C{degrees180}). 

@kwarg name: Name inlieu of this projection's name (C{str}). 

 

@return: An L{EasNor2Tuple}C{(easting, northing)}. 

 

@see: Methods L{CassiniSoldner.forward4}, L{CassiniSoldner.reverse} 

and L{CassiniSoldner.reverse4}. 

 

@raise CSSError: Invalid B{C{lat}} or B{C{lon}}. 

''' 

t = self.forward6(lat, lon, name=name) 

return EasNor2Tuple(t.easting, t.northing, name=t.name) 

 

def forward4(self, lat, lon, name=NN): 

'''Convert an (ellipsoidal) geodetic location to Cassini-Soldner 

easting and northing. 

 

@arg lat: Latitude of the location (C{degrees90}). 

@arg lon: Longitude of the location (C{degrees180}). 

@kwarg name: Name inlieu of this projection's name (C{str}). 

 

@return: An L{EasNorAziRk4Tuple}C{(easting, northing, 

azimuth, reciprocal)}. 

 

@see: Method L{CassiniSoldner.forward}, L{CassiniSoldner.forward6}, 

L{CassiniSoldner.reverse} and L{CassiniSoldner.reverse4}. 

 

@raise CSSError: Invalid B{C{lat}} or B{C{lon}}. 

''' 

t = self.forward6(lat, lon, name=name) 

return EasNorAziRk4Tuple(t.easting, t.northing, 

t.azimuth, t.reciprocal, name=t.name) 

 

def forward6(self, lat, lon, name=NN): 

'''Convert an (ellipsoidal) geodetic location to Cassini-Soldner 

easting and northing. 

 

@arg lat: Latitude of the location (C{degrees90}). 

@arg lon: Longitude of the location (C{degrees180}). 

@kwarg name: Name inlieu of this projection's name (C{str}). 

 

@return: An L{EasNorAziRkEqu6Tuple}C{(easting, northing, 

azimuth, reciprocal, equatorarc, equatorazimuth)}. 

 

@see: Method L{CassiniSoldner.forward}, L{CassiniSoldner.forward4}, 

L{CassiniSoldner.reverse} and L{CassiniSoldner.reverse4}. 

 

@raise CSSError: Invalid B{C{lat}} or B{C{lon}}. 

''' 

g = self.geodesic 

 

lat = Lat_(lat, Error=CSSError) 

d, _ = _diff182(self.lon0, Lon_(lon, Error=CSSError)) # _2sum 

D = abs(d) 

 

r = g.Inverse(lat, -D, lat, D) 

z1, a = r.azi1, (r.a12 * _0_5) 

z2, e = r.azi2, (r.s12 * _0_5) 

if e == 0: # PYCHOK no cover 

z = _diff182(z1, z2)[0] * _0_5 # _2sum 

c = _copysign(_90_0, 90 - D) # -90 if D > 90 else 90 

z1, z2 = c - z, c + z 

if d < 0: 

a, e, z2 = neg(a), neg(e), z1 

 

z = _norm180(z2) # azimuth of easting direction 

p = g.Line(lat, d, z, g.DISTANCE | g.GEODESICSCALE | g.LINE_OFF) 

# reciprocal of azimuthal northing scale 

rk = p.ArcPosition(neg(a), g.GEODESICSCALE).M21 

# rk = p._GenPosition(True, -a, g.DISTANCE)[7] 

 

s, c = _sincos2d(p.azi0) # aka equatorazimuth 

sb1 = _copysign(c, lat) 

cb1 = _copysign(s, 90 - D) # -abs(s) if D > 90 else abs(s) 

d = _atan2d(sb1 * self._cb0 - cb1 * self._sb0, 

cb1 * self._cb0 + sb1 * self._sb0) 

n = self._meridian.ArcPosition(d, g.DISTANCE).s12 

# n = self._meridian._GenPosition(True, d, g.DISTANCE)[4] 

return EasNorAziRkEqu6Tuple(e, n, z, rk, p.a1, p.azi0, 

name=name or self.name) 

 

@Property 

def geodesic(self): 

'''Get this projection's I{wrapped,Karney} U{Geodesic 

<https://GeographicLib.SourceForge.io/html/python/code.html>}, 

provided package U{geographiclib 

<https://PyPI.org/project/geographiclib>} is installed, 

otherwise L{GeodesicExact} instance. 

''' 

g = self._geodesic 

if g is None: 

try: 

g = self.datum.ellipsoid.geodesic 

except ImportError: 

g = self.datum.ellipsoid.geodesicx 

self._geodesic = g 

return g 

 

@geodesic.setter # PYCHOK setter! 

def geodesic(self, exact): 

'''Set this projection's geodesic (C{bool}) to L{GeodesicExact} 

or I{wrapped Karney}'s or C{None} for the default. 

 

@raise ImportError: Package U{geographiclib<https://PyPI.org/ 

project/geographiclib>} not installed or 

not found and C{B{exact}=False}. 

''' 

if exact is None: 

self._geodesic = None 

elif exact: 

self._geodesic = self.datum.ellipsoid.geodesicx 

else: 

self._geodesic = self.datum.ellipsoid.geodesic 

self.reset(*self.latlon0) 

 

@Property_RO 

def isExact(self): 

'''Return C{True} if this projection's geodesic is L{GeodesicExact}. 

''' 

return isinstance(self.geodesic, _MODS.geodesicx.GeodesicExact) 

 

@Property_RO 

def lat0(self): 

'''Get the center latitude (C{degrees90}). 

''' 

return self.latlon0.lat 

 

@property 

def latlon0(self): 

'''Get the center lat- and longitude (L{LatLon2Tuple}C{(lat, lon)}) 

in (C{degrees90}, (C{degrees180}). 

''' 

return self._latlon0 

 

@latlon0.setter # PYCHOK setter! 

def latlon0(self, latlon0): 

'''Set the center lat- and longitude (ellipsoidal C{LatLon}, 

L{LatLon2Tuple}, L{LatLon4Tuple} or a C{tuple} or C{list} 

with the C{lat}- and C{lon}gitude in C{degrees}). 

 

@raise CSSError: Invalid B{C{latlon0}} or ellipsoid mismatch 

of B{C{latlon0}} and this projection. 

''' 

if type(latlon0) in (tuple, list) and len(latlon0) > 1: 

lat0, lon0 = latlon0[:2] 

else: 

try: 

lat0, lon0 = latlon0.lat, latlon0.lon 

self._datumatch(latlon0) 

except (AttributeError, TypeError, ValueError) as x: 

raise CSSError(latlon0=latlon0, txt=str(x)) 

self.reset(lat0, lon0) 

 

@Property_RO 

def lon0(self): 

'''Get the center longitude (C{degrees180}). 

''' 

return self.latlon0.lon 

 

@deprecated_Property_RO 

def majoradius(self): # PYCHOK no cover 

'''DEPRECATED, use property C{equatoradius}.''' 

return self.equatoradius 

 

def reset(self, lat0, lon0): 

'''Set or reset the center point of this Cassini-Soldner projection. 

 

@arg lat0: Center point latitude (C{degrees90}). 

@arg lon0: Center point longitude (C{degrees180}). 

 

@raise CSSError: Invalid B{C{lat0}} or B{C{lon0}}. 

''' 

_update_all(self) 

 

g = self.geodesic 

self._meridian = m = g.Line(Lat_(lat0=lat0, Error=CSSError), 

Lon_(lon0=lon0, Error=CSSError), _0_0, 

g.STANDARD | g.DISTANCE_IN | g.LINE_OFF) 

self._latlon0 = LatLon2Tuple(m.lat1, m.lon1) 

s, c = _sincos2d(m.lat1) # == self.lat0 == self.LatitudeOrigin() 

self._sb0, self._cb0 = _norm2(s * g.f1, c) 

 

def reverse(self, easting, northing, LatLon=None, **LatLon_kwds): 

'''Convert a Cassini-Soldner location to (ellipsoidal) geodetic 

lat- and longitude. 

 

@arg easting: Easting of the location (C{meter}). 

@arg northing: Northing of the location (C{meter}). 

@kwarg LatLon: Optional, ellipsoidal class to return the 

geodetic location as (C{LatLon}) or C{None}. 

@kwarg LatLon_kwds: Optional (C{LatLon}) keyword arguments, 

ignored if C{B{LatLon} is None}. 

 

@return: Geodetic location B{C{LatLon}} or if B{C{LatLon}} 

is C{None}, a L{LatLon2Tuple}C{(lat, lon)}. 

 

@raise CSSError: Ellipsoidal mismatch of B{C{LatLon}} and this projection. 

 

@raise TypeError: Invalid B{C{LatLon}} or B{C{LatLon_kwds}}. 

 

@see: Method L{CassiniSoldner.reverse4}, L{CassiniSoldner.forward} 

and L{CassiniSoldner.forward4}. 

''' 

r = self.reverse4(easting, northing) 

if LatLon is None: 

r = LatLon2Tuple(r.lat, r.lon, name=self.name) # PYCHOK expected 

else: 

_xsubclassof(_LLEB, LatLon=LatLon) 

kwds = _xkwds(LatLon_kwds, datum=self.datum) 

r = self._xnamed(LatLon(r.lat, r.lon, **kwds)) # PYCHOK expected 

self._datumatch(r) 

return r 

 

def reverse4(self, easting, northing, name=NN): 

'''Convert a Cassini-Soldner location to (ellipsoidal) geodetic 

lat- and longitude. 

 

@arg easting: Easting of the location (C{meter}). 

@arg northing: Northing of the location (C{meter}). 

@kwarg name: Name inlieu of this projection's name (C{str}). 

 

@return: A L{LatLonAziRk4Tuple}C{(lat, lon, azimuth, reciprocal)}. 

 

@see: Method L{CassiniSoldner.reverse}, L{CassiniSoldner.forward} 

and L{CassiniSoldner.forward4}. 

''' 

g = self.geodesic 

n = self._meridian.Position(northing) 

r = g.Direct(n.lat2, n.lon2, n.azi2 + _90_0, easting, g.STANDARD | g.GEODESICSCALE) 

z = _umod_360(r.azi2) # -180 <= r.azi2 < 180 ... 0 <= z < 360 

# include azimuth of easting direction and reciprocal of 

# azimuthal northing scale (see C++ member Direct() 5/6 

# <https://GeographicLib.SourceForge.io/html/classGeographicLib_1_1Geodesic.html>) 

return LatLonAziRk4Tuple(r.lat2, r.lon2, z, r.M12, name=name or self.name) 

 

toLatLon = reverse # XXX not reverse4 

 

def toRepr(self, prec=6, **unused): # PYCHOK expected 

'''Return a string representation of this projection. 

 

@kwarg prec: Number of (decimal) digits, unstripped (C{int}). 

 

@return: This projection as C{"<classname>(lat0, lon0, ...)"} 

(C{str}). 

''' 

return _fstrLL0(self, prec, True) 

 

def toStr(self, prec=6, sep=_SPACE_, **unused): # PYCHOK expected 

'''Return a string representation of this projection. 

 

@kwarg prec: Number of (decimal) digits, unstripped (C{int}). 

@kwarg sep: Separator to join (C{str}). 

 

@return: This projection as C{"lat0 lon0"} (C{str}). 

''' 

t = _fstrLL0(self, prec, False) 

return t if sep is None else sep.join(t) 

 

 

class Css(_NamedBase): 

'''Cassini-Soldner East-/Northing location. 

''' 

_CS0 = None # default projection (L{CassiniSoldner}) 

_cs0 = None # projection (L{CassiniSoldner}) 

_easting = _0_0 # easting (C{float}) 

_height = 0 # height (C{meter}) 

_northing = _0_0 # northing (C{float}) 

 

def __init__(self, e, n, h=0, cs0=None, name=NN): 

'''New L{Css} Cassini-Soldner position. 

 

@arg e: Easting (C{meter}). 

@arg n: Northing (C{meter}). 

@kwarg h: Optional height (C{meter}). 

@kwarg cs0: Optional, the Cassini-Soldner projection 

(L{CassiniSoldner}). 

@kwarg name: Optional name (C{str}). 

 

@return: The Cassini-Soldner location (L{Css}). 

 

@raise CSSError: If B{C{e}} or B{C{n}} is invalid. 

 

@raise TypeError: If B{C{cs0}} is not L{CassiniSoldner}. 

 

@raise ValueError: Invalid B{C{h}}. 

 

@example: 

 

>>> cs = Css(448251, 5411932.0001) 

''' 

self._cs0 = _CS0(cs0) 

self._easting = Easting(e, Error=CSSError) 

self._northing = Northing(n, Error=CSSError) 

if h: 

self._height = Height(h=h) 

if name: 

self.name = name 

 

@Property_RO 

def azi(self): 

'''Get the azimuth of easting direction (C{degrees}). 

''' 

return self.reverse4.azimuth 

 

azimuth = azi 

 

@Property 

def cs0(self): 

'''Get the projection (L{CassiniSoldner}). 

''' 

return self._cs0 or Css._CS0 

 

@cs0.setter # PYCHOK setter! 

def cs0(self, cs0): 

'''Set the I{Cassini-Soldner} projection. 

 

@arg cs0: The projection (L{CassiniSoldner}). 

 

@raise TypeError: Invalid B{C{cs0}}. 

''' 

cs0 = _CS0(cs0) 

if cs0 != self._cs0: 

_update_all(self) 

self._cs0 = cs0 

 

# def dup(self, name=NN, **e_n_h_cs0): # PYCHOK signature 

# '''Duplicate this position with some attributes modified. 

# 

# @kwarg e_n_h_cs0: Use keyword argument C{B{e}=...}, C{B{n}=...}, 

# C{B{h}=...} and/or C{B{cs0}=...} to override 

# the current C{easting}, C{northing} C{height} 

# or C{cs0} projectio, respectively. 

# ''' 

# def _args_kwds(e=None, n=None, **kwds): 

# return (e, n), kwds 

# 

# kwds = _xkwds(e_n_h_cs0, e=self.easting, n=self.northing, 

# h=self.height, cs0=self.cs0, 

# name=name or self.name) 

# args, kwds = _args_kwds(**kwds) 

# return self.__class__(*args, **kwds) # .classof 

 

@Property_RO 

def easting(self): 

'''Get the easting (C{meter}). 

''' 

return self._easting 

 

@Property_RO 

def height(self): 

'''Get the height (C{meter}). 

''' 

return self._height 

 

@Property_RO 

def latlon(self): 

'''Get the lat- and longitude (L{LatLon2Tuple}). 

''' 

r = self.reverse4 

return LatLon2Tuple(r.lat, r.lon, name=self.name) 

 

@Property_RO 

def northing(self): 

'''Get the northing (C{meter}). 

''' 

return self._northing 

 

@Property_RO 

def reverse4(self): 

'''Get the lat, lon, azimuth and reciprocal (L{LatLonAziRk4Tuple}). 

''' 

return self.cs0.reverse4(self.easting, self.northing, name=self.name) 

 

@Property_RO 

def rk(self): 

'''Get the reciprocal of azimuthal northing scale (C{scalar}). 

''' 

return self.reverse4.reciprocal 

 

reciprocal = rk 

 

def toLatLon(self, LatLon=None, height=None, **LatLon_kwds): 

'''Convert this L{Css} to an (ellipsoidal) geodetic point. 

 

@kwarg LatLon: Optional, ellipsoidal class to return the 

geodetic point (C{LatLon}) or C{None}. 

@kwarg height: Optional height for the point, overriding the 

default height (C{meter}). 

@kwarg LatLon_kwds: Optional, additional B{C{LatLon}} keyword 

arguments, ignored if C{B{LatLon} is None}. 

 

@return: The geodetic point (B{C{LatLon}}) or if B{C{LatLon}} 

is C{None}, a L{LatLon4Tuple}C{(lat, lon, height, 

datum)}. 

 

@raise TypeError: If B{C{LatLon}} or B{C{datum}} is not 

ellipsoidal or invalid B{C{height}} or 

B{C{LatLon_kwds}}. 

''' 

if LatLon: 

_xsubclassof(_LLEB, LatLon=LatLon) 

 

lat, lon = self.latlon 

h = self.height if height is None else Height(height) 

return _LL4Tuple(lat, lon, h, self.cs0.datum, LatLon, LatLon_kwds, 

inst=self, name=self.name) 

 

def toRepr(self, prec=6, fmt=Fmt.SQUARE, sep=_COMMASPACE_, m=_m_, C=False): # PYCHOK expected 

'''Return a string representation of this L{Css} position. 

 

@kwarg prec: Number of (decimal) digits, unstripped (C{int}). 

@kwarg fmt: Enclosing backets format (C{str}). 

@kwarg sep: Optional separator between name:values (C{str}). 

@kwarg m: Optional unit of the height, default meter (C{str}). 

@kwarg C: Optionally, include name of projection (C{bool}). 

 

@return: This position as C{"[E:meter, N:meter, H:m, name:'', 

C:Conic.Datum]"} (C{str}). 

''' 

t, T = _fstrENH2(self, prec, m) 

if self.name: 

t += repr(self.name), 

T += _name_, 

if C: 

t += self.cs0.toRepr(prec=prec), 

T += _C_, 

return _xzipairs(T, t, sep=sep, fmt=fmt) 

 

def toStr(self, prec=6, sep=_SPACE_, m=_m_): # PYCHOK expected 

'''Return a string representation of this L{Css} position. 

 

@kwarg prec: Number of (decimal) digits, unstripped (C{int}). 

@kwarg sep: Optional separator to join (C{str}) or C{None} 

to return an unjoined C{tuple} of C{str}s. 

@kwarg m: Height units, default C{meter} (C{str}). 

 

@return: This position as C{"easting nothing"} C{str} in 

C{meter} plus C{" height"} and C{'m'} if height 

is non-zero (C{str}). 

''' 

t, _ = _fstrENH2(self, prec, m) 

return t if sep is None else sep.join(t) 

 

 

class EasNorAziRk4Tuple(_NamedTuple): 

'''4-Tuple C{(easting, northing, azimuth, reciprocal)} for the 

Cassini-Soldner location with C{easting} and C{northing} in 

C{meters} and the C{azimuth} of easting direction and 

C{reciprocal} of azimuthal northing scale, both in C{degrees}. 

''' 

_Names_ = (_easting_, _northing_, _azimuth_, _reciprocal_) 

_Units_ = ( Easting, Northing, Bearing, Scalar) 

 

 

class EasNorAziRkEqu6Tuple(_NamedTuple): 

'''6-Tuple C{(easting, northing, azimuth, reciprocal, equatorarc, 

equatorazimuth)} for the Cassini-Soldner location with 

C{easting} and C{northing} in C{meters} and the C{azimuth} of 

easting direction, C{reciprocal} of azimuthal northing scale, 

C{equatorarc} and C{equatorazimuth}, all in C{degrees}. 

''' 

_Names_ = EasNorAziRk4Tuple._Names_ + ('equatorarc', 'equatorazimuth') 

_Units_ = EasNorAziRk4Tuple._Units_ + ( Degrees, Bearing) 

 

 

class LatLonAziRk4Tuple(_NamedTuple): 

'''4-Tuple C{(lat, lon, azimuth, reciprocal)}, all in C{degrees} 

where C{azimuth} is the azimuth of easting direction and 

C{reciprocal} the reciprocal of azimuthal northing scale. 

''' 

_Names_ = (_lat_, _lon_, _azimuth_, _reciprocal_) 

_Units_ = ( Lat_, Lon_, Bearing, Scalar) 

 

 

def toCss(latlon, cs0=None, height=None, Css=Css, name=NN): 

'''Convert an (ellipsoidal) geodetic point to a Cassini-Soldner 

location. 

 

@arg latlon: Ellipsoidal point (C{LatLon} or L{LatLon4Tuple}). 

@kwarg cs0: Optional, the Cassini-Soldner projection to use 

(L{CassiniSoldner}). 

@kwarg height: Optional height for the point, overriding the 

default height (C{meter}). 

@kwarg Css: Optional class to return the location (L{Css}) or C{None}. 

@kwarg name: Optional B{C{Css}} name (C{str}). 

 

@return: The Cassini-Soldner location (B{C{Css}}) or an 

L{EasNor3Tuple}C{(easting, northing, height)} 

if B{C{Css}} is C{None}. 

 

@raise CSSError: Ellipsoidal mismatch of B{C{latlon}} and B{C{cs0}}. 

 

@raise ImportError: Package U{geographiclib<https://PyPI.org/ 

project/geographiclib>} not installed or 

not found. 

 

@raise TypeError: If B{C{latlon}} is not ellipsoidal. 

''' 

_xinstanceof(_LLEB, LatLon4Tuple, latlon=latlon) 

 

cs = _CS0(cs0) 

cs._datumatch(latlon) 

 

c = cs.forward4(latlon.lat, latlon.lon) 

h = latlon.height if height is None else Height(height) 

n = name or nameof(latlon) 

 

if Css is None: 

r = EasNor3Tuple(c.easting, c.northing, h, name=n) 

else: 

r = Css(c.easting, c.northing, h=h, cs0=cs, name=n) 

r._latlon = LatLon2Tuple(latlon.lat, latlon.lon, name=n) 

r._azi, r._rk = c.azimuth, c.reciprocal 

return r 

 

# **) MIT License 

# 

# Copyright (C) 2016-2022 -- mrJean1 at Gmail -- All Rights Reserved. 

# 

# Permission is hereby granted, free of charge, to any person obtaining a 

# copy of this software and associated documentation files (the "Software"), 

# to deal in the Software without restriction, including without limitation 

# the rights to use, copy, modify, merge, publish, distribute, sublicense, 

# and/or sell copies of the Software, and to permit persons to whom the 

# Software is furnished to do so, subject to the following conditions: 

# 

# The above copyright notice and this permission notice shall be included 

# in all copies or substantial portions of the Software. 

# 

# THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS 

# OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, 

# FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL 

# THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR 

# OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, 

# ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR 

# OTHER DEALINGS IN THE SOFTWARE.