# Coverage for pygeodesy/azimuthal.py : 94%

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L{EquidistantKarney} uses ellipsoidal formulas and requires I{Charles Karney's} Python implementation of U{GeographicLib<https://PyPI.org/project/geographiclib/>} package to be installed. Other azimuthal classes implement only (**) U{Snyder's FORMULAS FOR THE SPHERE <https://pubs.er.USGS.gov/djvu/PP/PP_1395.pdf>} and use those for any datum, spherical and ellipsoidal. The radius used for the latter is the ellipsoid's I{mean radius of curvature} at the latitude of the projection center point. For further justification, see the first paragraph under U{Snyder's FORMULAS FOR THE ELLIPSOID, page 197<https://pubs.er.USGS.gov/djvu/PP/PP_1395.pdf>}. Page numbers in C{Snyder} references apply to U{John P. Snyder, "Map Projections -- A Working Manual", 1987<https://pubs.er.USGS.gov/djvu/PP/PP_1395.pdf>} @newfield example: Example, Examples ''' from pygeodesy.basics import EPS, EPS1, PI, PI_2, property_doc_, \ property_RO, _xinstanceof, _xkwds from pygeodesy.ellipsoidalBase import LatLonEllipsoidalBase as _LLEB from pygeodesy.datum import Datum, Datums, _spherical_datum from pygeodesy.errors import _datum_datum, _ValueError from pygeodesy.interns import _azimuth_, _COMMA_SPACE_, _datum_, _lat_, \ _lat0_, _lon_, _lon0_, _name_, NN, \ _scale_, _SPACE_, _x_, _y_ from pygeodesy.karney import _norm180 from pygeodesy.latlonBase import LatLonBase as _LLB from pygeodesy.lazily import _ALL_DOCS, _ALL_LAZY, _FOR_DOCS from pygeodesy.named import LatLon2Tuple, LatLon4Tuple, _NamedBase, \ _NamedTuple, _xnamed from pygeodesy.streprs import strs from pygeodesy.units import Bearing, Lat, Lon, Scalar, Scalar_ from pygeodesy.utily import asin1, atan2d, sincos2, sincos2d from math import acos, asin, atan, atan2, degrees, hypot, sin, sqrt __all__ = _ALL_LAZY.azimuthal __version__ = '20.07.21' class _AzimuthalBase(_NamedBase): '''(INTERNAL) Base class for azimuthal projections. Azimuthal projections are centered at an arbitrary position on the sphere or ellipsoid. For a point in projected space C{(x, y)}, the geodesic distance from the center position is C{hypot(x, y)} and the C{azimuth} off tru North of the geodesic from the center point is C{atan2(x, y)} (note C{(x, y)}, not C{(y, x)}!). The C{.forward} and C{.reverse} methods both return the C{azimuth} of the geodesic at C{(x, y)} and the C{scale} in the azimuthal direction which, together with the basic properties of the projection, serve to specify completely the local affine transformation between geographic and projected coordinates. ''' _datum = Datums.WGS84 #: (INTERNAL) L{Datum}. _latlon0 = () #: (INTERNAL) lat0, lon0 (L{LatLon2Tuple}). _radius = None #: (INTERNAL) Geodentric radius (L{Radius}). _sc0 = () #: (INTERNAL) 2-Tuple C{sincos2(lat0)}. def __init__(self, lat0, lon0, datum=None, name=NN): '''New azimuthal projection. @arg lat0: Latitude of center point (C{degrees90}). @arg lon0: Longitude of center point (C{degrees180}). @kwarg datum: Optional datum (C{Datum}) or the radius of the I{spherical} earth (C{meter}). @kwarg name: Optional name for the projection (C{str}). @raise RangeError: Invalid B{C{lat0}} or B{C{lon0}}. @raise UnitError: Invalid B{C{lat0}}, B{C{lon0}} or B{C{datum}}. ''' if name: self.name = name if datum: d = datum if isinstance(datum, Datum) else \ _spherical_datum(datum, name=name) if self._datum != d: self._datum = d self.reset(lat0, lon0) @property_RO def datum(self): '''Get the datum (L{Datum}). ''' return self._datum @property_RO def equatoradius(self): '''Get the geodesic's equatorial (major) radius, semi-axis (C{meter}). ''' return self.datum.ellipsoid.a majoradius = equatoradius # for compatibility @property_RO def flattening(self): '''Get the geodesic's flattening (C{float}). ''' return self.datum.ellipsoid.f def _forward(self, lat, lon, name, _k_t): '''(INTERNAL) Azimuthal (spherical) forward C{lat, lon} to C{x, y}. ''' sa, ca, sb, cb = sincos2d(Lat(lat), Lon(lon) - self.lon0) s0, c0 = self._sc0 k, t = _k_t(s0 * sa + c0 * ca * cb) if t: r = k * self.radius x = r * ca * sb y = r * (c0 * sa - s0 * ca * cb) z = atan2d(x, y) # (x, y) for azimuth from true North else: # 0 or 180 x = y = z = 0 t = Azimuthal7Tuple(x, y, lat, lon, z, k, self.datum) return _xnamed(t, name or self.name) @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 (C{LatLon}, L{LatLon2Tuple} or L{LatLon4Tuple}). @raise AzimuthalError: Ellipsoidal mismatch of B{C{latlon0}} and this projection. @raise RangeError: Invalid B{C{lat0}} or B{C{lon0}}. @raise UnitError: Invalid B{C{lat0}} or B{C{lon0}}. ''' B = _LLEB if self.datum.isEllipsoidal else _LLB _xinstanceof(B, LatLon2Tuple, LatLon4Tuple, latlon0=latlon0) if hasattr(latlon0, _datum_): _datum_datum(self.datum, latlon0.datum, Error=AzimuthalError) self.reset(latlon0.lat, latlon0.lon) @property_RO def lon0(self): '''Get the center longitude (C{degrees180}). ''' return self._latlon0.lon @property_RO def radius(self): '''Get this projection's mean radius of curvature (C{meter}). ''' if self._radius is None: self._radius = self.datum.ellipsoid.rocMean(self.lat0) return self._radius def reset(self, lat0, lon0): '''Set or reset the center point of this azimuthal projection. @arg lat0: Center point latitude (C{degrees90}). @arg lon0: Center point longitude (C{degrees180}). @raise RangeError: Invalid B{C{lat0}} or B{C{lon0}}. @raise UnitError: Invalid B{C{lat0}} or B{C{lon0}}. ''' self._latlon0 = LatLon2Tuple(Lat( lat0, name=_lat0_), Lon(_norm180(lon0), name=_lon0_)) self._sc0 = tuple(sincos2d(self.lat0)) self._radius = None def _reverse(self, x, y, name, LatLon, LatLon_kwds, _c_t, lea): '''(INTERNAL) Azimuthal (spherical) reverse C{x, y} to C{lat, lon}. ''' x = Scalar(x, name=_x_) y = Scalar(y, name=_y_) r = hypot(x, y) c, t = _c_t(r / self.radius) if t: s0, c0 = self._sc0 sc, cc = sincos2(c) k = c / sc z = atan2d(x, y) # (x, y) for azimuth from true North lat = degrees(asin1(s0 * cc + c0 * sc * (y / r))) if lea or abs(c0) > EPS: lon = atan2(x * sc, c0 * cc * r - s0 * sc * y) else: lon = atan2(x, (y if s0 < 0 else -y)) lon = _norm180(self.lon0 + degrees(lon)) else: k, z = 1, 0 lat, lon = self.latlon0 t = self._toLatLon(lat, lon, LatLon, LatLon_kwds) if LatLon else \ Azimuthal7Tuple(x, y, lat, lon, z, k, self.datum) return _xnamed(t, name or self.name) def _toLatLon(self, lat, lon, LatLon, LatLon_kwds): '''(INTERNAL) Check B{C{LatLon}} and return an instance. ''' kwds = _xkwds(LatLon_kwds, datum=self.datum) r = LatLon(lat, lon, **kwds) # handle .classof B = _LLEB if self.datum.isEllipsoidal else _LLB _xinstanceof(B, LatLon=r) return r def toRepr(self, prec=6, **unused): # PYCHOK expected '''Return a string representation of this projection. @kwarg prec: Optional number of decimals, unstripped (C{int}). @return: This projection as C{"<classname>(lat0, lon0, ...)"} (C{str}). ''' t = self.toStr(prec=prec, sep=_COMMA_SPACE_) n = self.name or NN if n: n = ', %s=%r' % (_name_, n) return '%s(%s%s)' % (self.classname, t, n) def toStr(self, prec=6, sep=_SPACE_, **unused): # PYCHOK expected '''Return a string representation of this projection. @kwarg prec: Optional number of decimal, unstripped (C{int}). @kwarg sep: Optional separator to join (C{str}). @return: This projection as C{"lat0 lon0"} (C{str}). ''' return sep.join(strs(self.latlon0, prec=prec)) class AzimuthalError(_ValueError): '''An azimuthal L{Equidistant}, L{EquidistantKarney}, L{Gnomonic}, L{LambertEqualArea}, L{Orthographic} or L{Stereographic} issue. ''' pass class Azimuthal7Tuple(_NamedTuple): '''7-Tuple C{(x, y, lat, lon, azimuth, scale, datum)}, in C{meter}, C{meter}, C{degrees90}, C{degrees180}, C{degrees360}, C{float} and C{Datum} where C{(x, y)} is the projected, C{(lat, lon)} the geodetic location, C{azimuth} the azimuth direction off true North and C{scale} is the projection scale, either (C{1 / reciprocal} or C{1} or C{-1} in one case, L{Equidistant}). ''' _Names_ = (_x_, _y_, _lat_, _lon_, _azimuth_, _scale_, _datum_) def __new__(cls, x, y, lat, lon, azi, s, datum): return _NamedTuple.__new__(cls, Scalar(x, name=_x_, Error=AzimuthalError), Scalar(y, name=_y_, Error=AzimuthalError), # PYCHOK indent Lat(lat, Error=AzimuthalError), Lon(lon, Error=AzimuthalError), Bearing(azi, name=_azimuth_, Error=AzimuthalError), Scalar(s, name=_scale_, Error=AzimuthalError), datum) class Equidistant(_AzimuthalBase): '''Azimuthal equidistant projection for the sphere**, see U{Snyder, pp 195-197 <https://pubs.er.USGS.gov/djvu/PP/PP_1395.pdf>} and U{MathWorld-Wolfram <https://MathWorld.Wolfram.com/AzimuthalEquidistantProjection.html>}. ''' if _FOR_DOCS: __init__ = _AzimuthalBase.__init__ def forward(self, lat, lon, name=NN): '''Convert a geodetic location to azimuthal equidistant east- and northing. @arg lat: Latitude of the location (C{degrees90}). @arg lon: Longitude of the location (C{degrees180}). @kwarg name: Optional name for the location (C{str}). @return: An L{Azimuthal7Tuple}C{(x, y, lat, lon, azimuth, scale, datum)} with C{x} and C{y} in C{meter} and C{lat} and C{lon} in C{degrees}. The C{scale} of the projection is C{1} in I{radial} direction, C{azimuth} clockwise from true North and is C{1 / reciprocal} in the direction perpendicular to this. @note: The C{scale} will be C{-1} if B{C{(lat, lon)}} is antipodal to the projection center C{(lat0, lon0)}. ''' def _k_t(c): t = abs(c) < EPS1 if t: c = acos(c) # XXX utily.acos1 k = c / sin(c) else: k = -1 if c < 0 else 1 # int(copysign(1, c)) return k, t return self._forward(lat, lon, name, _k_t) def reverse(self, x, y, name=NN, LatLon=None, **LatLon_kwds): '''Convert an azimuthal equidistant location to geodetic lat- and longitude. @arg x: Easting of the location (C{meter}). @arg y: Northing of the location (C{meter}). @kwarg name: Optional name for the location (C{str}). @kwarg LatLon: Class to use (C{LatLon}) or C{None}. @kwarg LatLon_kwds: Optional, additional B{C{LatLon}} keyword arguments, ignored if B{C{LatLon=None}}. @return: The geodetic (C{LatLon}) of if B{C{LatLon}} is C{None} an L{Azimuthal7Tuple}C{(x, y, lat, lon, azimuth, scale, datum)}. @note: The C{lat} will be in the range C{[-90..90] degrees} and C{lon} in the range C{[-180..180] degrees}. The C{scale} of the projection is C{1} in I{radial} direction, C{azimuth} clockwise from true North and is C{1 / reciprocal} in the direction perpendicular to this. ''' def _c_t(c): return c, (c > EPS) return self._reverse(x, y, name, LatLon, LatLon_kwds, _c_t, False) def equidistant(lat0, lon0, datum=Datums.WGS84, name=NN): '''If Karney's U{geographiclib<https://PyPI.org/project/geographiclib>} package is installed, return an L{EquidistantKarney} otherwise an L{Equidistant} instance. ''' try: return EquidistantKarney(lat0, lon0, datum=datum, name=name) except ImportError: return Equidistant(lat0, lon0, datum=datum, name=name) # PYCHOK expected class EquidistantKarney(_AzimuthalBase): '''Azimuthal equidistant projection, a Python version of Karney's C++ class U{AzimuthalEquidistant <https://GeographicLib.SourceForge.io/1.49/classGeographicLib_1_1AzimuthalEquidistant.html>}, requiring package U{geographiclib<https://PyPI.org/project/geographiclib>} to be installed. An azimuthal equidistant projection is centered at an arbitrary position on the ellipsoid. For a point in projected space C{(x, y)}, the geodesic distance from the center position is C{hypot(x, y)} and the C{azimuth} of the geodesic from the center point is C{atan2(x, y)}, note C{(x, y)}, not C{(y, x)}!. The C{.forward} and C{.reverse} methods also return the C{azimuth} of the geodesic at C{(x, y)} and the C{scale} in the azimuthal direction which, together with the basic properties of the projection, serve to specify completely the local affine transformation between geographic and projected coordinates. ''' _eps = sqrt(EPS) * 0.01 _mask = 0 def __init__(self, lat0, lon0, datum=Datums.WGS84, name=NN): '''New azimuthal L{EquidistantKarney} projection. @arg lat0: Latitude of center point (C{degrees90}). @arg lon0: Longitude of center point (C{degrees180}). @kwarg datum: Optional (ellipsoidal) datum (C{Datum}). @kwarg name: Optional name for the projection (C{str}). @raise ImportError: Package U{GeographicLib<https://PyPI.org/ project/geographiclib>} missing. @raise RangeError: Invalid B{C{lat0}} or B{C{lon0}}. @raise UnitError: Invalid B{C{lat0}} or B{C{lon0}}. ''' _AzimuthalBase.__init__(self, lat0, lon0, datum=datum, name=name) g = self.geodesic self._mask = g.AZIMUTH | g.DISTANCE | g.LATITUDE | g.LONGITUDE| g.REDUCEDLENGTH def forward(self, lat, lon, name=NN): '''Convert an (ellipsoidal) geodetic location to azimuthal equidistant east- and northing. @arg lat: Latitude of the location (C{degrees90}). @arg lon: Longitude of the location (C{degrees180}). @kwarg name: Optional name for the location (C{str}). @return: An L{Azimuthal7Tuple}C{(x, y, lat, lon, azimuth, scale, datum)} with C{x} and C{y} in C{meter} and C{lat} and C{lon} in C{degrees}. The C{scale} of the projection is C{1} in I{radial} direction, C{azimuth} clockwise from true North and is C{1 / reciprocal} in the direction perpendicular to this. @see: Method L{EquidistantKarney.reverse}. A call to C{.forward} followed by a call to C{.reverse} will return the original C{lat, lon} to within roundoff. ''' r = self.geodesic.Inverse(self.lat0, self.lon0, Lat(lat), Lon(lon), self._mask) x, y = sincos2d(r.azi1) t = Azimuthal7Tuple(x * r.s12, y * r.s12, r.lat2, r.lon2, r.azi2, self._1_rk(r), self.datum) return _xnamed(t, name or self.name) @property_RO def geodesic(self): '''Get this projection's I{wrapped} U{Karney Geodesic <https://GeographicLib.SourceForge.io/html/python/code.html>}, provided package U{geographiclib <https://PyPI.org/project/geographiclib>} is installed. ''' return self.datum.ellipsoid.geodesic def reverse(self, x, y, name=NN, LatLon=None, **LatLon_kwds): '''Convert an azimuthal equidistant location to (ellipsoidal) geodetic lat- and longitude. @arg x: Easting of the location (C{meter}). @arg y: Northing of the location (C{meter}). @kwarg name: Optional name for the location (C{str}). @kwarg LatLon: Class to use (C{LatLon}) or C{None}. @kwarg LatLon_kwds: Optional, additional B{C{LatLon}} keyword arguments, ignored if B{C{LatLon=None}}. @return: The geodetic (C{LatLon}) of if B{C{LatLon}} is C{None} an L{Azimuthal7Tuple}C{(x, y, lat, lon, azimuth, scale, datum)}. @note: The C{lat} will be in the range C{[-90..90] degrees} and C{lon} in the range C{[-180..180] degrees}. The scale of the projection is C{1} in I{radial} direction, C{azimuth} clockwise from true North and is C{1 / reciprocal} in the direction perpendicular to this. ''' x = Scalar(x, name=_x_) y = Scalar(y, name=_y_) z = atan2d(x, y) # (x, y) for azimuth from true North s = hypot( x, y) r = self.geodesic.Direct(self.lat0, self.lon0, z, s, self._mask) t = self._toLatLon(r.lat2, r.lon2, LatLon, LatLon_kwds) if LatLon else \ Azimuthal7Tuple(x, y, r.lat2, r.lon2, r.azi2, self._1_rk(r), self.datum) return _xnamed(t, name or self.name) def _1_rk(self, r): '''(INTERNAL) Compute the reciprocal, azimuthal scale. ''' return (r.m12 / r.s12) if r.a12 > self._eps else 1 class Gnomonic(_AzimuthalBase): '''Azimuthal gnomonic projection for the sphere**, see U{Snyder, pp 164-168 <https://pubs.er.USGS.gov/djvu/PP/PP_1395.pdf>} and U{MathWorld-Wolfram <https://MathWorld.Wolfram.com/GnomonicProjection.html>}. ''' if _FOR_DOCS: __init__ = _AzimuthalBase.__init__ def forward(self, lat, lon, name=NN): '''Convert a geodetic location to azimuthal equidistant east- and northing. @arg lat: Latitude of the location (C{degrees90}). @arg lon: Longitude of the location (C{degrees180}). @kwarg name: Optional name for the location (C{str}). @return: An L{Azimuthal7Tuple}C{(x, y, lat, lon, azimuth, scale, datum)} with C{x} and C{y} in C{meter} and C{lat} and C{lon} in C{degrees}. The C{scale} of the projection is C{1} in I{radial} direction, C{azimuth} clockwise from true North and is C{1 / reciprocal} in the direction perpendicular to this. ''' def _k_t(c): t = c > EPS if t: k = 1 / c else: k = 1 return k, t return self._forward(lat, lon, name, _k_t) def reverse(self, x, y, name=NN, LatLon=None, **LatLon_kwds): '''Convert an azimuthal equidistant location to geodetic lat- and longitude. @arg x: Easting of the location (C{meter}). @arg y: Northing of the location (C{meter}). @kwarg name: Optional name for the location (C{str}). @kwarg LatLon: Class to use (C{LatLon}) or C{None}. @kwarg LatLon_kwds: Optional, additional B{C{LatLon}} keyword arguments, ignored if B{C{LatLon=None}}. @return: The geodetic (C{LatLon}) of if B{C{LatLon}} is C{None} an L{Azimuthal7Tuple}C{(x, y, lat, lon, azimuth, scale, datum)}. @note: The C{lat} will be in the range C{[-90..90] degrees} and C{lon} in the range C{[-180..180] degrees}. The C{scale} of the projection is C{1} in I{radial} direction, C{azimuth} clockwise from true North and is C{1 / reciprocal} in the direction perpendicular to this. ''' def _c_t(c): return atan(c), (c > EPS) return self._reverse(x, y, name, LatLon, LatLon_kwds, _c_t, False) class LambertEqualArea(_AzimuthalBase): '''Lambert-equal-area projection for the sphere**, see U{Snyder, pp 185-187 <https://pubs.er.USGS.gov/djvu/PP/PP_1395.pdf>} and U{MathWorld-Wolfram <https://MathWorld.Wolfram.com/LambertAzimuthalEqual-AreaProjection.html>}. ''' if _FOR_DOCS: __init__ = _AzimuthalBase.__init__ def forward(self, lat, lon, name=NN): '''Convert a geodetic location to azimuthal Lambert-equal-area east- and northing. @arg lat: Latitude of the location (C{degrees90}). @arg lon: Longitude of the location (C{degrees180}). @kwarg name: Optional name for the location (C{str}). @return: An L{Azimuthal7Tuple}C{(x, y, lat, lon, azimuth, scale, datum)} with C{x} and C{y} in C{meter} and C{lat} and C{lon} in C{degrees}. The C{scale} of the projection is C{1} in I{radial} direction, C{azimuth} clockwise from true North and is C{1 / reciprocal} in the direction perpendicular to this. ''' def _k_t(c): c = c + 1 t = c > EPS if t: k = sqrt(2 / c) else: k = 1 return k, t return self._forward(lat, lon, name, _k_t) def reverse(self, x, y, name=NN, LatLon=None, **LatLon_kwds): '''Convert an azimuthal Lambert-equal-area location to geodetic lat- and longitude. @arg x: Easting of the location (C{meter}). @arg y: Northing of the location (C{meter}). @kwarg name: Optional name for the location (C{str}). @kwarg LatLon: Class to use (C{LatLon}) or C{None}. @kwarg LatLon_kwds: Optional, additional B{C{LatLon}} keyword arguments, ignored if B{C{LatLon=None}}. @return: The geodetic (C{LatLon}) of if B{C{LatLon}} is C{None} an L{Azimuthal7Tuple}C{(x, y, lat, lon, azimuth, scale, datum)}. @note: The C{lat} will be in the range C{[-90..90] degrees} and C{lon} in the range C{[-180..180] degrees}. The C{scale} of the projection is C{1} in I{radial} direction, C{azimuth} clockwise from true North and is C{1 / reciprocal} in the direction perpendicular to this. ''' def _c_t(c): c = c / 2 t = c > EPS if t: c = PI if c > EPS1 else (2 * asin(c)) # utily.asin1 return c, t return self._reverse(x, y, name, LatLon, LatLon_kwds, _c_t, True) class Orthographic(_AzimuthalBase): '''Orthographic projection for the sphere**, see U{Snyder, pp 148-153 <https://pubs.er.USGS.gov/djvu/PP/PP_1395.pdf>} and U{MathWorld-Wolfram <https://MathWorld.Wolfram.com/OrthographicProjection.html>}. ''' if _FOR_DOCS: __init__ = _AzimuthalBase.__init__ def forward(self, lat, lon, name=NN): '''Convert a geodetic location to azimuthal orthographic east- and northing. @arg lat: Latitude of the location (C{degrees90}). @arg lon: Longitude of the location (C{degrees180}). @kwarg name: Optional name for the location (C{str}). @return: An L{Azimuthal7Tuple}C{(x, y, lat, lon, azimuth, scale, datum)} with C{x} and C{y} in C{meter} and C{lat} and C{lon} in C{degrees}. The C{scale} of the projection is C{1} in I{radial} direction, C{azimuth} clockwise from true North and is C{1 / reciprocal} in the direction perpendicular to this. ''' def _k_t(c): return 1, (c >= 0) return self._forward(lat, lon, name, _k_t) def reverse(self, x, y, name=NN, LatLon=None, **LatLon_kwds): '''Convert an azimuthal orthographic location to geodetic lat- and longitude. @arg x: Easting of the location (C{meter}). @arg y: Northing of the location (C{meter}). @kwarg name: Optional name for the location (C{str}). @kwarg LatLon: Class to use (C{LatLon}) or C{None}. @kwarg LatLon_kwds: Optional, additional B{C{LatLon}} keyword arguments, ignored if B{C{LatLon=None}}. @return: The geodetic (C{LatLon}) of if B{C{LatLon}} is C{None} an L{Azimuthal7Tuple}C{(x, y, lat, lon, azimuth, scale, datum)}. @note: The C{lat} will be in the range C{[-90..90] degrees} and C{lon} in the range C{[-180..180] degrees}. The C{scale} of the projection is C{1} in I{radial} direction, C{azimuth} clockwise from true North and is C{1 / reciprocal} in the direction perpendicular to this. ''' def _c_t(c): t = c > EPS if t: c = PI_2 if c > EPS1 else asin(c) # utily.asin1 return c, t return self._reverse(x, y, name, LatLon, LatLon_kwds, _c_t, False) class Stereographic(_AzimuthalBase): '''Stereographic projection for the sphere**, see U{Snyder, pp 157-160 <https://pubs.er.USGS.gov/djvu/PP/PP_1395.pdf>} and U{MathWorld-Wolfram <https://MathWorld.Wolfram.com/StereographicProjection.html>}. ''' _k0 = 1 #: Central scale factor (C{scalar}). if _FOR_DOCS: __init__ = _AzimuthalBase.__init__ def forward(self, lat, lon, name=NN): '''Convert a geodetic location to azimuthal stereographic east- and northing. @arg lat: Latitude of the location (C{degrees90}). @arg lon: Longitude of the location (C{degrees180}). @kwarg name: Optional name for the location (C{str}). @return: An L{Azimuthal7Tuple}C{(x, y, lat, lon, azimuth, scale, datum)} with C{x} and C{y} in C{meter} and C{lat} and C{lon} in C{degrees}. The C{scale} of the projection is C{1} in I{radial} direction, C{azimuth} clockwise from true North and is C{1 / reciprocal} in the direction perpendicular to this. ''' def _k_t(c): c = c + 1 t = abs(c) > EPS if t: k = 2 * self._k0 / c else: k = 1 return k, t return self._forward(lat, lon, name, _k_t) @property_doc_('''optional, central scale factor (C{scalar}).''') def k0(self): '''Get the central scale factor (C{scalar}). ''' return self._k0 @k0.setter # PYCHOK setter! def k0(self, factor): '''Set the central scale factor (C{scalar}). ''' n = Stereographic.k0.fget.__name__ self._k0 = Scalar_(factor, name=n, low=EPS, high=2) # XXX high=1, 2, other? def reverse(self, x, y, name=NN, LatLon=None, **LatLon_kwds): '''Convert an azimuthal stereographic location to geodetic lat- and longitude. @arg x: Easting of the location (C{meter}). @arg y: Northing of the location (C{meter}). @kwarg name: Optional name for the location (C{str}). @kwarg LatLon: Class to use (C{LatLon}) or C{None}. @kwarg LatLon_kwds: Optional, additional B{C{LatLon}} keyword arguments, ignored if B{C{LatLon=None}}. @return: The geodetic (C{LatLon}) of if B{C{LatLon}} is C{None} an L{Azimuthal7Tuple}C{(x, y, lat, lon, azimuth, scale, datum)}. @note: The C{lat} will be in the range C{[-90..90] degrees} and C{lon} in the range C{[-180..180] degrees}. The C{scale} of the projection is C{1} in I{radial} direction, C{azimuth} clockwise from true North and is C{1 / reciprocal} in the direction perpendicular to this. ''' def _c_t(c): t = c > EPS if t: c = 2 * atan2(c, 2 * self._k0) return c, t return self._reverse(x, y, name, LatLon, LatLon_kwds, _c_t, False) __all__ += _ALL_DOCS(Azimuthal7Tuple, _AzimuthalBase) # **) MIT License # # Copyright (C) 2016-2020 -- 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.