# Coverage for pygeodesy/sphericalTrigonometry.py : 95%

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Trigonometric classes geodetic (lat-/longitude) L{LatLon} and geocentric (ECEF) L{Cartesian} and functions L{areaOf}, L{intersection}, L{intersections2}, L{isPoleEnclosedBy}, L{meanOf}, L{nearestOn3} and L{perimeterOf}, I{all spherical}. Pure Python implementation of geodetic (lat-/longitude) methods using spherical trigonometry, transcribed from JavaScript originals by I{(C) Chris Veness 2011-2016} published under the same MIT Licence**, see U{Latitude/Longitude<https://www.Movable-Type.co.UK/scripts/latlong.html>}. ''' # make sure int/int division yields float quotient, see .basics from __future__ import division from pygeodesy.basics import copysign, isscalar, map1 from pygeodesy.datums import _ellipsoidal_datum, _mean_radius from pygeodesy.errors import _AssertionError, CrossError, crosserrors, \ _ValueError, IntersectionError, _xError, \ _xkwds, _xkwds_get from pygeodesy.fmath import favg, fdot, fmean, Fsum, fsum, fsum_ from pygeodesy.formy import antipode_, bearing_, _bearingTo2, excessAbc, \ excessGirard, excessLHuilier, _radical2, vincentys_ from pygeodesy.interns import EPS, EPS0, EPS1, PI, PI2, PI_2, PI_4, R_M, \ _EPS4, _coincident_, _colinear_, _convex_, \ _end_, _invalid_, _LatLon_, _near_concentric_, \ _not_, _points_, _SPACE_, _too_, _1_, _2_, \ _0_0, _0_5, _1_0, _2_0, _90_0 from pygeodesy.lazily import _ALL_LAZY, _ALL_OTHER from pygeodesy.named import notImplemented, _xnamed from pygeodesy.namedTuples import LatLon2Tuple, LatLon3Tuple, \ NearestOn3Tuple, Triangle7Tuple, \ Triangle8Tuple from pygeodesy.nvectorBase import NvectorBase as _Nvector from pygeodesy.points import ispolar, nearestOn5 as _nearestOn5 from pygeodesy.props import deprecated_function, deprecated_method from pygeodesy.sphericalBase import _angular, CartesianSphericalBase, \ LatLonSphericalBase, _rads3, _trilaterate5 from pygeodesy.streprs import Fmt as _Fmt # XXX shadowed from pygeodesy.units import Bearing_, Height, Lam_, Phi_, Radius, \ Radius_, Scalar from pygeodesy.utily import acos1, asin1, degrees90, degrees180, degrees2m, \ m2radians, radiansPI2, sincos2, tan_2, \ unrollPI, wrap180, wrapPI from pygeodesy.vector3d import sumOf, Vector3d from math import asin, atan2, cos, degrees, hypot, radians, sin __all__ = _ALL_LAZY.sphericalTrigonometry __version__ = '21.06.02' _infinite_ = 'infinite' _null_ = 'null' _parallel_ = 'parallel' _path_ = 'path' _PI_EPS4 = PI - _EPS4 if _PI_EPS4 >= PI: raise _AssertionError(EPS4=_EPS4, PI=PI, PI_EPS4=_PI_EPS4) def _destination2(a, b, r, t): '''(INTERNAL) Destination lat- and longitude in C{radians}. @arg a: Latitude (C{radians}). @arg b: Longitude (C{radians}). @arg r: Angular distance (C{radians}). @arg t: Bearing (compass C{radians}). @return: 2-Tuple (phi, lam) of (C{radians}, C{radiansPI}). ''' # see <https://www.EdWilliams.org/avform.htm#LL> sa, ca, sr, cr, st, ct = sincos2(a, r, t) a = asin1(ct * sr * ca + cr * sa) d = atan2(st * sr * ca, cr - sa * sin(a)) # note, in EdWilliams.org/avform.htm W is + and E is - return a, b + d def _r2m(r, radius): '''(INTERNAL) Angular distance in C{radians} to C{meter}. ''' if radius is R_M: r *= R_M elif radius is not None: # not in (None, _0_0) r *= Radius(radius) return r class Cartesian(CartesianSphericalBase): '''Extended to convert geocentric, L{Cartesian} points to spherical, geodetic L{LatLon}. ''' def toLatLon(self, **LatLon_datum_kwds): # PYCHOK LatLon=LatLon '''Convert this cartesian point to an C{Nvector}-based geodetic point. @kwarg LatLon_datum_kwds: Optional L{LatLon}, B{C{datum}} and other keyword arguments, ignored if C{B{LatLon}=None}. Use C{B{LatLon}=...} to override this L{LatLon} class or specify C{B{LatLon}=None}. @return: The geodetic point (L{LatLon}) or if B{C{LatLon}} is C{None}, an L{Ecef9Tuple}C{(x, y, z, lat, lon, height, C, M, datum)} with C{C} and C{M} if available. @raise TypeError: Invalid B{C{LatLon_datum_kwds}}. ''' kwds = _xkwds(LatLon_datum_kwds, LatLon=LatLon, datum=self.datum) return CartesianSphericalBase.toLatLon(self, **kwds) class LatLon(LatLonSphericalBase): '''New point on spherical model earth model. @example: >>> p = LatLon(52.205, 0.119) # height=0 ''' def _trackDistanceTo3(self, start, end, radius, wrap): '''(INTERNAL) Helper for .along-/crossTrackDistanceTo. ''' self.others(start=start) self.others(end=end) r = Radius_(radius) r = start.distanceTo(self, r, wrap=wrap) / r b = radians(start.initialBearingTo(self, wrap=wrap)) e = radians(start.initialBearingTo(end, wrap=wrap)) x = asin(sin(r) * sin(b - e)) return r, x, (e - b) def alongTrackDistanceTo(self, start, end, radius=R_M, wrap=False): '''Compute the (angular) distance (signed) from the start to the closest point on the great circle path defined by a start and an end point. That is, if a perpendicular is drawn from this point to the great circle path, the along-track distance is the distance from the start point to the point where the perpendicular crosses the path. @arg start: Start point of great circle path (L{LatLon}). @arg end: End point of great circle path (L{LatLon}). @kwarg radius: Mean earth radius (C{meter}) or C{None}. @kwarg wrap: Wrap and unroll longitudes (C{bool}). @return: Distance along the great circle path (C{meter}, same units as B{C{radius}}) or C{radians} if C{B{radius}=None}, positive if after the B{C{start}} toward the B{C{end}} point of the path or negative if before the B{C{start}} point. @raise TypeError: Invalid B{C{start}} or B{C{end}} point. @raise ValueError: Invalid B{C{radius}}. @example: >>> p = LatLon(53.2611, -0.7972) >>> s = LatLon(53.3206, -1.7297) >>> e = LatLon(53.1887, 0.1334) >>> d = p.alongTrackDistanceTo(s, e) # 62331.58 ''' r, x, b = self._trackDistanceTo3(start, end, radius, wrap) cx = cos(x) return _0_0 if abs(cx) < EPS0 else \ _r2m(copysign(acos1(cos(r) / cx), cos(b)), radius) @deprecated_method def bearingTo(self, other, wrap=False, raiser=False): # PYCHOK no cover '''DEPRECATED, use method L{initialBearingTo}. ''' return self.initialBearingTo(other, wrap=wrap, raiser=raiser) def crossingParallels(self, other, lat, wrap=False): '''Return the pair of meridians at which a great circle defined by this and an other point crosses the given latitude. @arg other: The other point defining great circle (L{LatLon}). @arg lat: Latitude at the crossing (C{degrees}). @kwarg wrap: Wrap and unroll longitudes (C{bool}). @return: 2-Tuple C{(lon1, lon2)}, both in C{degrees180} or C{None} if the great circle doesn't reach B{C{lat}}. ''' self.others(other) a1, b1 = self.philam a2, b2 = other.philam a = radians(lat) db, b2 = unrollPI(b1, b2, wrap=wrap) sa, ca, sa1, ca1, \ sa2, ca2, sdb, cdb = sincos2(a, a1, a2, db) x = sa1 * ca2 * ca * sdb y = sa1 * ca2 * ca * cdb - ca1 * sa2 * ca z = ca1 * ca2 * sa * sdb h = hypot(x, y) if h < EPS or abs(z) > h: return None # great circle doesn't reach latitude m = atan2(-y, x) + b1 # longitude at max latitude d = acos1(z / h) # delta longitude to intersections return degrees180(m - d), degrees180(m + d) def crossTrackDistanceTo(self, start, end, radius=R_M, wrap=False): '''Compute the (angular) distance (signed) from this point to the great circle defined by a start and an end point. @arg start: Start point of great circle path (L{LatLon}). @arg end: End point of great circle path (L{LatLon}). @kwarg radius: Mean earth radius (C{meter}) or C{None}. @kwarg wrap: Wrap and unroll longitudes (C{bool}). @return: Distance to great circle (negative if to the left or positive if to the right of the path) (C{meter}, same units as B{C{radius}} or C{radians} if B{C{radius}} is C{None}). @raise TypeError: The B{C{start}} or B{C{end}} point is not L{LatLon}. @raise ValueError: Invalid B{C{radius}}. @example: >>> p = LatLon(53.2611, -0.7972) >>> s = LatLon(53.3206, -1.7297) >>> e = LatLon(53.1887, 0.1334) >>> d = p.crossTrackDistanceTo(s, e) # -307.5 ''' _, x, _ = self._trackDistanceTo3(start, end, radius, wrap) return _r2m(x, radius) def destination(self, distance, bearing, radius=R_M, height=None): '''Locate the destination from this point after having travelled the given distance on the given initial bearing. @arg distance: Distance travelled (C{meter}, same units as B{C{radius}}). @arg bearing: Bearing from this point (compass C{degrees360}). @kwarg radius: Mean earth radius (C{meter}). @kwarg height: Optional height at destination (C{meter}, same units a B{C{radius}}). @return: Destination point (L{LatLon}). @raise ValueError: Invalid B{C{distance}}, B{C{bearing}}, B{C{radius}} or B{C{height}}. @example: >>> p1 = LatLon(51.4778, -0.0015) >>> p2 = p1.destination(7794, 300.7) >>> p2.toStr() # '51.5135°N, 000.0983°W' @JSname: I{destinationPoint}. ''' a, b = self.philam r, t = _angular(distance, radius), Bearing_(bearing) a, b = _destination2(a, b, r, t) h = self.height if height is None else Height(height) return self.classof(degrees90(a), degrees180(b), height=h) def distanceTo(self, other, radius=R_M, wrap=False): '''Compute the (angular) distance from this to an other point. @arg other: The other point (L{LatLon}). @kwarg radius: Mean earth radius (C{meter}) or C{None}. @kwarg wrap: Wrap and unroll longitudes (C{bool}). @return: Distance between this and the B{C{other}} point (C{meter}, same units as B{C{radius}} or C{radians} if B{C{radius}} is C{None}). @raise TypeError: The B{C{other}} point is not L{LatLon}. @raise ValueError: Invalid B{C{radius}}. @example: >>> p1 = LatLon(52.205, 0.119) >>> p2 = LatLon(48.857, 2.351); >>> d = p1.distanceTo(p2) # 404300 ''' self.others(other) a1, b1 = self.philam a2, b2 = other.philam db, _ = unrollPI(b1, b2, wrap=wrap) return _r2m(vincentys_(a2, a1, db), radius) # @Property_RO # def Ecef(self): # '''Get the ECEF I{class} (L{EcefVeness}), I{lazily}. # ''' # from pygeodesy.ecef import EcefKarney # return EcefKarney def greatCircle(self, bearing): '''Compute the vector normal to great circle obtained by heading on the given initial bearing from this point. Direction of vector is such that initial bearing vector b = c × n, where n is an n-vector representing this point. @arg bearing: Bearing from this point (compass C{degrees360}). @return: Vector representing great circle (L{Vector3d}). @raise ValueError: Invalid B{C{bearing}}. @example: >>> p = LatLon(53.3206, -1.7297) >>> g = p.greatCircle(96.0) >>> g.toStr() # (-0.794, 0.129, 0.594) ''' a, b = self.philam t = Bearing_(bearing) sa, ca, sb, cb, st, ct = sincos2(a, b, t) return Vector3d(sb * ct - cb * sa * st, -cb * ct - sb * sa * st, ca * st) # XXX .unit()? def initialBearingTo(self, other, wrap=False, raiser=False): '''Compute the initial bearing (forward azimuth) from this to an other point. @arg other: The other point (spherical L{LatLon}). @kwarg wrap: Wrap and unroll longitudes (C{bool}). @kwarg raiser: Optionally, raise L{CrossError} (C{bool}), use C{B{raiser}=True} for behavior like C{sphericalNvector.LatLon.initialBearingTo}. @return: Initial bearing (compass C{degrees360}). @raise CrossError: If this and the B{C{other}} point coincide, provided both B{C{raiser}} is C{True} and L{crosserrors} is C{True}. @raise TypeError: The B{C{other}} point is not L{LatLon}. @example: >>> p1 = LatLon(52.205, 0.119) >>> p2 = LatLon(48.857, 2.351) >>> b = p1.initialBearingTo(p2) # 156.2 @JSname: I{bearingTo}. ''' self.others(other) a1, b1 = self.philam a2, b2 = other.philam # XXX behavior like sphericalNvector.LatLon.initialBearingTo if raiser and crosserrors() and max(abs(a2 - a1), abs(b2 - b1)) < EPS: raise CrossError(_points_, self, txt=_coincident_) return degrees(bearing_(a1, b1, a2, b2, final=False, wrap=wrap)) def intermediateTo(self, other, fraction, height=None, wrap=False): '''Locate the point at given fraction between this and an other point. @arg other: The other point (L{LatLon}). @arg fraction: Fraction between both points (float, between 0.0 for this and 1.0 for the other point). @kwarg height: Optional height, overriding the fractional height (C{meter}). @kwarg wrap: Wrap and unroll longitudes (C{bool}). @return: Intermediate point (L{LatLon}). @raise TypeError: The B{C{other}} point is not L{LatLon}. @raise ValueError: Invalid B{C{fraction}} or B{C{height}}. @example: >>> p1 = LatLon(52.205, 0.119) >>> p2 = LatLon(48.857, 2.351) >>> p = p1.intermediateTo(p2, 0.25) # 51.3721°N, 000.7073°E @JSname: I{intermediatePointTo}. ''' self.others(other) f = Scalar(fraction=fraction) # not high=_1_0 a1, b1 = self.philam a2, b2 = other.philam db, b2 = unrollPI(b1, b2, wrap=wrap) r = vincentys_(a2, a1, db) sr = sin(r) if abs(sr) > EPS0: sa1, ca1, sa2, ca2, \ sb1, cb1, sb2, cb2 = sincos2(a1, a2, b1, b2) A = sin((_1_0 - f) * r) / sr B = sin( f * r) / sr x = A * ca1 * cb1 + B * ca2 * cb2 y = A * ca1 * sb1 + B * ca2 * sb2 z = A * sa1 + B * sa2 a = atan2(z, hypot(x, y)) b = atan2(y, x) else: # points too close a = favg(a1, a2, f=f) b = favg(b1, b2, f=f) h = self._havg(other, f=f) if height is None else Height(height) return self.classof(degrees90(a), degrees180(b), height=h) def intersection(self, end1, other, end2, height=None, wrap=False): '''Compute the intersection point of two paths, each defined by two points or a start point and bearing from North. @arg end1: End point of this path (L{LatLon}) or the initial bearing at this point (compass C{degrees360}). @arg other: Start point of the other path (L{LatLon}). @arg end2: End point of the other path (L{LatLon}) or the initial bearing at the other start point (compass C{degrees360}). @kwarg height: Optional height for intersection point, overriding the mean height (C{meter}). @kwarg wrap: Wrap and unroll longitudes (C{bool}). @return: The intersection point (L{LatLon}). An alternate intersection point might be the L{antipode} to the returned result. @raise IntersectionError: Ambiguous or infinite intersection or colinear, parallel or otherwise non-intersecting paths. @raise TypeError: If B{C{other}} is not L{LatLon} or B{C{end1}} or B{C{end2}} not C{scalar} nor L{LatLon}. @raise ValueError: Invalid B{C{height}} or C{null} path. @example: >>> p = LatLon(51.8853, 0.2545) >>> s = LatLon(49.0034, 2.5735) >>> i = p.intersection(108.547, s, 32.435) # '50.9078°N, 004.5084°E' ''' try: s2 = self.others(other) return _intersect(self, end1, s2, end2, height=height, wrap=wrap, LatLon=self.classof) except (TypeError, ValueError) as x: raise _xError(x, start1=self, end1=end1, other=other, end2=end2) def intersections2(self, rad1, other, rad2, radius=R_M, eps=_0_0, height=None, wrap=True): '''Compute the intersection points of two circles, each defined by a center point and radius. @arg rad1: Radius of the this circle (C{meter} or C{radians}, see B{C{radius}}). @arg other: Center point of the other circle (L{LatLon}). @arg rad2: Radius of the other circle (C{meter} or C{radians}, see B{C{radius}}). @kwarg radius: Mean earth radius (C{meter} or C{None} if B{C{rad1}}, B{C{rad2}} and B{C{eps}} are given in C{radians}). @kwarg eps: Required overlap (C{meter} or C{radians}, see B{C{radius}}). @kwarg height: Optional height for the intersection points (C{meter}, conventionally) or C{None} for the I{"radical height"} at the I{radical line} between both centers. @kwarg wrap: Wrap and unroll longitudes (C{bool}). @return: 2-Tuple of the intersection points, each a L{LatLon} instance. For abutting circles, both intersection points are the same instance. @raise IntersectionError: Concentric, antipodal, invalid or non-intersecting circles. @raise TypeError: If B{C{other}} is not L{LatLon}. @raise ValueError: Invalid B{C{rad1}}, B{C{rad2}}, B{C{radius}}, B{C{eps}} or B{C{height}}. ''' try: c2 = self.others(other) return _intersects2(self, rad1, c2, rad2, radius=radius, eps=eps, height=height, wrap=wrap, LatLon=self.classof) except (TypeError, ValueError) as x: raise _xError(x, center=self, rad1=rad1, other=other, rad2=rad2) def isenclosedBy(self, points): '''Check whether a (convex) polygon encloses this point. @arg points: The polygon points (L{LatLon}[]). @return: C{True} if the polygon encloses this point, C{False} otherwise. @raise PointsError: Insufficient number of B{C{points}}. @raise TypeError: Some B{C{points}} are not L{LatLon}. @raise ValueError: Invalid B{C{points}}, non-convex polygon. @example: >>> b = LatLon(45,1), LatLon(45,2), LatLon(46,2), LatLon(46,1) >>> p = LatLon(45,1, 1.1) >>> inside = p.isEnclosedBy(b) # True ''' Ps = self.PointsIter(points, loop=2) n0 = self._N_vector v2 = Ps[0]._N_vector v1 = Ps[1]._N_vector gc1 = v2.cross(v1) # check whether this point on same side of all # polygon edges (to the left or right depending # on anti-/clockwise polygon direction) t0 = gc1.angleTo(n0) > PI_2 # get great-circle vector for each edge for i, p in Ps.enumerate(closed=False): v2 = p._N_vector gc = v1.cross(v2) v1 = v2 ti = gc.angleTo(n0) > PI_2 if ti != t0: # different sides of edge i return False # outside # check for convex polygon, the angle between # gc vectors, signed by direction of n0 # (otherwise the test above is not reliable) if gc1.angleTo(gc, vSign=n0) < 0: t = _Fmt.SQUARE(points=i) raise _ValueError(t, p, txt=_not_(_convex_)) gc1 = gc # if False: # # get great-circle vector for each edge # gc, v1 = [], points[n-1]._N_vector # for i in range(n): # v2 = points[i]._N_vector # gc.append(v1.cross(v2)) # v1 = v2 # # # check whether this point on same side of all # # polygon edges (to the left or right depending # # on anti-/clockwise polygon direction) # t0 = gc[0].angleTo(n0) > PI_2 # True if on the right # for i in range(1, n): # ti = gc[i].angleTo(n0) > PI_2 # if ti != t0: # different sides of edge i # return False # outside # # # check for convex polygon (otherwise # # the test above is not reliable) # gc1 = gc[n-1] # for i, gc2 in enumerate(gc): # # angle between gc vectors, signed by direction of n0 # if gc1.angleTo(gc2, vSign=n0) < 0: # ti = _Fmt.SQUARE(points=i) # raise _ValueError(ti, points[i], txt=_not_(_convex_)) # gc1 = gc2 return True # inside @deprecated_method def isEnclosedBy(self, points): # PYCHOK no cover '''DEPRECATED, use method C{isenclosedBy}.''' return self.isenclosedBy(points) def midpointTo(self, other, height=None, wrap=False): '''Find the midpoint between this and an other point. @arg other: The other point (L{LatLon}). @kwarg height: Optional height for midpoint, overriding the mean height (C{meter}). @kwarg wrap: Wrap and unroll longitudes (C{bool}). @return: Midpoint (L{LatLon}). @raise TypeError: The B{C{other}} point is not L{LatLon}. @raise ValueError: Invalid B{C{height}}. @example: >>> p1 = LatLon(52.205, 0.119) >>> p2 = LatLon(48.857, 2.351) >>> m = p1.midpointTo(p2) # '50.5363°N, 001.2746°E' ''' self.others(other) # see <https://MathForum.org/library/drmath/view/51822.html> a1, b1 = self.philam a2, b2 = other.philam db, b2 = unrollPI(b1, b2, wrap=wrap) sa1, ca1, sa2, ca2, sdb, cdb = sincos2(a1, a2, db) x = ca2 * cdb + ca1 y = ca2 * sdb a = atan2(sa1 + sa2, hypot(x, y)) b = atan2(y, x) + b1 h = self._havg(other) if height is None else Height(height) return self.classof(degrees90(a), degrees180(b), height=h) def nearestOn(self, point1, point2, radius=R_M, **options): '''Locate the point between two points closest to this point. Distances are approximated by function L{equirectangular_}, subject to the supplied B{C{options}}. @arg point1: Start point (L{LatLon}). @arg point2: End point (L{LatLon}). @kwarg radius: Mean earth radius (C{meter}). @kwarg options: Optional keyword arguments for function L{equirectangular_}. @return: Closest point on the great circle path (L{LatLon}). @raise LimitError: Lat- and/or longitudinal delta exceeds B{C{limit}}, see function L{equirectangular_}. @raise NotImplementedError: Keyword argument C{B{within}=False} is not (yet) supported. @raise TypeError: Invalid B{C{point1}} or B{C{point2}}. @raise ValueError: Invalid B{C{radius}} or B{C{options}}. @see: Functions L{equirectangular_} and L{nearestOn5} and method L{sphericalTrigonometry.LatLon.nearestOn3}. ''' try: # remove kwarg B{C{within}} if present within = options.pop('within') if not within: notImplemented(self, within=within) # # UNTESTED - handle C{B{within}=False} and C{B{within}=True} # wrap = options.get('wrap', False) # a = self.alongTrackDistanceTo(point1, point2, radius=radius, wrap=wrap) # if abs(a) < EPS or (within and a < EPS): # return point1 # d = point1.distanceTo(point2, radius=radius, wrap=wrap) # if abs(d) < EPS0: # return point1 # or point2 # elif abs(d - a) < EPS or (a + EPS) > d: # return point2 # f = a / d # if within: # if f > EPS1: # return point2 # elif f < EPS: # return point1 # return point1.intermediateTo(point2, f, wrap=wrap) except KeyError: pass # without kwarg B{C{within}}, use backward compatible .nearestOn3 return self.nearestOn3([point1, point2], closed=False, radius=radius, **options)[0] @deprecated_method def nearestOn2(self, points, closed=False, radius=R_M, **options): # PYCHOK no cover '''DEPRECATED, use method L{sphericalTrigonometry.LatLon.nearestOn3}. @return: ... 2-Tuple C{(closest, distance)} of the closest point (L{LatLon}) on the polygon and the distance to that point from this point in C{meter}, same units of B{C{radius}}. ''' r = self.nearestOn3(points, closed=closed, radius=radius, **options) return r.closest, r.distance def nearestOn3(self, points, closed=False, radius=R_M, **options): '''Locate the point on a polygon closest to this point. Distances are approximated by function L{equirectangular_}, subject to the supplied B{C{options}}. @arg points: The polygon points (L{LatLon}[]). @kwarg closed: Optionally, close the polygon (C{bool}). @kwarg radius: Mean earth radius (C{meter}). @kwarg options: Optional keyword arguments for function L{equirectangular_}. @return: A L{NearestOn3Tuple}C{(closest, distance, angle)} of the C{closest} point (L{LatLon}), the L{equirectangular_} C{distance} between this and the C{closest} point in C{meter}, same units as B{C{radius}}. The C{angle} from this to the C{closest} point is in compass C{degrees360}, like function L{compassAngle}. @raise LimitError: Lat- and/or longitudinal delta exceeds B{C{limit}}, see function L{equirectangular_}. @raise PointsError: Insufficient number of B{C{points}}. @raise TypeError: Some B{C{points}} are not C{LatLon}. @raise ValueError: Invalid B{C{radius}} or B{C{options}}. @see: Functions L{compassAngle}, L{equirectangular_} and L{nearestOn5}. ''' if _LatLon_ in options: raise _ValueError(**options) lat, lon, d, c, h = _nearestOn5(self, points, closed=closed, **options) return NearestOn3Tuple(self.classof(lat, lon, height=h), degrees2m(d, radius=radius), c) def toCartesian(self, **Cartesian_datum_kwds): # PYCHOK Cartesian=Cartesian, datum=None '''Convert this point to C{Karney}-based cartesian (ECEF) coordinates. @kwarg Cartesian_datum_kwds: Optional L{Cartesian}, B{C{datum}} and other keyword arguments, ignored if C{B{Cartesian}=None}. Use C{B{Cartesian}=...} to override this L{Cartesian} class or specify C{B{Cartesian}=None}. @return: The cartesian point (L{Cartesian}) or if B{C{Cartesian}} is C{None}, an L{Ecef9Tuple}C{(x, y, z, lat, lon, height, C, M, datum)} with C{C} and C{M} if available. @raise TypeError: Invalid B{C{Cartesian_datum_kwds}}. ''' kwds = _xkwds(Cartesian_datum_kwds, Cartesian=Cartesian, datum=self.datum) return LatLonSphericalBase.toCartesian(self, **kwds) def triangle7(self, otherB, otherC, radius=R_M, wrap=False): '''Compute the angles, sides and area of a spherical triangle. @arg otherB: Second triangle point (C{LatLon}). @arg otherC: Third triangle point (C{LatLon}). @kwarg radius: Mean earth radius, ellipsoid or datum (C{meter}, L{Ellipsoid}, L{Ellipsoid2}, L{Datum} or L{a_f2Tuple}) or C{None}. @kwarg wrap: Wrap/unroll angular distances (C{bool}). @return: L{Triangle7Tuple}C{(A, a, B, b, C, c, area)} or if B{C{radius}} is C{None}, a L{Triangle8Tuple}C{(A, a, B, b, C, c, D, E)}. @see: Function L{triangle7} and U{Spherical trigonometry <https://WikiPedia.org/wiki/Spherical_trigonometry>}. ''' self.others(otherB=otherB) self.others(otherC=otherC) r = self.philam + otherB.philam + otherC.philam t = triangle8_(*r, wrap=wrap) return self._xnamed(_t8_7(t, radius)) def trilaterate5(self, distance1, point2, distance2, point3, distance3, area=True, eps=EPS1, radius=R_M, wrap=False): '''Trilaterate three points by area overlap or perimeter intersection of three corresponding circles. @arg distance1: Distance to this point (C{meter}, same units as B{C{radius}}). @arg point2: Second center point (C{LatLon}). @arg distance2: Distance to point2 (C{meter}, same units as B{C{radius}}). @arg point3: Third center point (C{LatLon}). @arg distance3: Distance to point3 (C{meter}, same units as B{C{radius}}). @kwarg area: If C{True} compute the area overlap, otherwise the perimeter intersection of the circles (C{bool}). @kwarg eps: The required I{minimal overlap} for C{B{area}=True} or the I{intersection margin} for C{B{area}=False} (C{meter}, same units as B{C{radius}}). @kwarg radius: Mean earth radius (C{meter}, conventionally). @kwarg wrap: Wrap/unroll angular distances (C{bool}). @return: A L{Trilaterate5Tuple}C{(min, minPoint, max, maxPoint, n)} with C{min} and C{max} in C{meter}, same units as B{C{eps}}, the corresponding trilaterated points C{minPoint} and C{maxPoint} as I{spherical} C{LatLon} and C{n}, the number of trilatered points found for the given B{C{eps}}. If only a single trilaterated point is found, C{min I{is} max}, C{minPoint I{is} maxPoint} and C{n = 1}. For C{B{area}=True}, C{min} and C{max} are the smallest respectively largest I{radial} overlap found. For C{B{area}=False}, C{min} and C{max} represent the nearest respectively farthest intersection margin. If C{B{area}=True} and all 3 circles are concentric, C{n = 0} and C{minPoint} and C{maxPoint} are both the B{C{point#}} with the smallest B{C{distance#}} C{min} and C{max} the largest B{C{distance#}}. @raise IntersectionError: Trilateration failed for the given B{C{eps}}, insufficient overlap for C{B{area}=True} or no intersection or all (near-)concentric for C{B{area}=False}. @raise TypeError: Invalid B{C{point2}} or B{C{point3}}. @raise ValueError: Coincident B{C{points}} or invalid B{C{distance1}}, B{C{distance2}}, B{C{distance3}} or B{C{radius}}. ''' return _trilaterate5(self, distance1, self.others(point2=point2), distance2, self.others(point3=point3), distance3, area=area, radius=radius, eps=eps, wrap=wrap) _T00 = LatLon(0, 0, name='T00') # reference instance (L{LatLon}) def areaOf(points, radius=R_M, wrap=True): '''Calculate the area of a (spherical) polygon (with the points joined by great circle arcs). @arg points: The polygon points (L{LatLon}[]). @kwarg radius: Mean earth radius, ellipsoid or datum (C{meter}, L{Ellipsoid}, L{Ellipsoid2}, L{Datum} or L{a_f2Tuple}) or C{None}. @kwarg wrap: Wrap and unroll longitudes (C{bool}). @return: Polygon area (C{meter} I{quared}, same units as B{C{radius}} or C{radians} if B{C{radius}} is C{None}). @raise PointsError: Insufficient number of B{C{points}}. @raise TypeError: Some B{C{points}} are not L{LatLon}. @raise ValueError: Invalid B{C{radius}} or semi-circular polygon edge. @note: The area is based on I{Karney}'s U{'Area of a spherical polygon'<https://OSGeo-org.1560.x6.nabble.com/ Area-of-a-spherical-polygon-td3841625.html>}. @see: L{pygeodesy.areaOf}, L{sphericalNvector.areaOf}, L{ellipsoidalKarney.areaOf} and L{excessKarney}. @example: >>> b = LatLon(45, 1), LatLon(45, 2), LatLon(46, 2), LatLon(46, 1) >>> areaOf(b) # 8666058750.718977 >>> c = LatLon(0, 0), LatLon(1, 0), LatLon(0, 1) >>> areaOf(c) # 6.18e9 ''' Ps = _T00.PointsIter(points, loop=1) p1 = p2 = Ps[0] A = Fsum() # mean phi E = Fsum() # see L{excessKarney_} a1, b1 = p1.philam ta1 = tan_2(a1) # ispolar: Summation of course deltas around pole is 0° rather than normally ±360° # <https://blog.Element84.com/determining-if-a-spherical-polygon-contains-a-pole.html> # XXX duplicate of function C{points.ispolar} to avoid copying all iterated points D = Fsum() z1 = _0_0 # z1, _ = _bearingTo2(p2, p1, wrap=wrap) for i, p2 in Ps.enumerate(closed=True): a2, b2 = p2.philam db, b2 = unrollPI(b1, b2, wrap=wrap if i else False) ta2 = tan_2(a2) E += atan2(tan_2(db, points=i) * (ta1 + ta2), _1_0 + ta1 * ta2) ta1, b1 = ta2, b2 if not p2.isequalTo(p1, EPS): z, z2 = _bearingTo2(p1, p2, wrap=wrap) D.fadd_(wrap180(z - z1), # (z - z1 + 540) % 360 - 180 wrap180(z2 - z)) # (z2 - z + 540) % 360 - 180 p1, z1 = p2, z2 A += a2 r = abs(E.fsum()) * _2_0 if abs(D.fsum()) < _90_0: # ispolar(points) r = abs(r - PI2) if radius: a = degrees(A.fsum() / len(A)) # mean lat r *= _mean_radius(radius, a)**2 return r def _ib(a1, b1, end, a, b, wrap): # difference between the bearing to (a, b) and the given # bearing is negative if both are in opposite directions r = bearing_(a1, b1, a, b, wrap=wrap) return abs(wrapPI(r - radians(end))) > PI_2 def _i3d2(start, end, wrap, _i_, hs): # see <https://www.EdWilliams.org/intersect.htm> (5) ff a1, b1 = start.philam if isscalar(end): # bearing, make a point a2, b2 = _destination2(a1, b1, PI_4, radians(end)) else: # must be a point start.others(end, name=_end_ + _i_) hs.append(end.height) a2, b2 = end.philam db, b2 = unrollPI(b1, b2, wrap=wrap) if max(abs(db), abs(a2 - a1)) < EPS: raise _ValueError(_SPACE_(_path_ + _i_, _null_)) # note, in EdWilliams.org/avform.htm W is + and E is - b21, b12 = db * _0_5, -(b1 + b2) * _0_5 sb21, cb21, sb12, cb12, \ sa21, _, sa12, _ = sincos2(b21, b12, a1 - a2, a1 + a2) x = _Nvector(sa21 * sb12 * cb21 - sa12 * cb12 * sb21, sa21 * cb12 * cb21 + sa12 * sb12 * sb21, cos(a1) * cos(a2) * sin(db)) # ll=start return x.unit(), (db, (a2 - a1)) # negated d def _idot(ds, a1, b1, a, b, wrap): # compute dot product d . (-b + b1, a - a1) db, _ = unrollPI(b1, b, wrap=wrap) return fdot(ds, db, a - a1) def intersection(start1, end1, start2, end2, height=None, wrap=False, LatLon=LatLon, **LatLon_kwds): '''Compute the intersection point of two paths, each defined by two points or a start point and bearing from North. @arg start1: Start point of the first path (L{LatLon}). @arg end1: End point ofthe first path (L{LatLon}) or the initial bearing at the first start point (compass C{degrees360}). @arg start2: Start point of the second path (L{LatLon}). @arg end2: End point of the second path (L{LatLon}) or the initial bearing at the second start point (compass C{degrees360}). @kwarg height: Optional height for the intersection point, overriding the mean height (C{meter}). @kwarg wrap: Wrap and unroll longitudes (C{bool}). @kwarg LatLon: Optional class to return the intersection point (L{LatLon}) or C{None}. @kwarg LatLon_kwds: Optional, additional B{C{LatLon}} keyword arguments, ignored if C{B{LatLon}=None}. @return: The intersection point as a (B{C{LatLon}}) or a if C{B{LatLon}=None} a L{LatLon3Tuple}C{(lat, lon, height)}. An alternate intersection point might be the L{antipode} to the returned result. @raise IntersectionError: Ambiguous or infinite intersection or colinear, parallel or otherwise non-intersecting paths. @raise TypeError: A B{C{start}} or B{C{end}} point not L{LatLon}. @raise ValueError: Invalid B{C{height}} or C{null} path. @example: >>> p = LatLon(51.8853, 0.2545) >>> s = LatLon(49.0034, 2.5735) >>> i = intersection(p, 108.547, s, 32.435) # '50.9078°N, 004.5084°E' ''' _T00.others(start1=start1) _T00.others(start2=start2) try: return _intersect(start1, end1, start2, end2, heighth=height, wrap=wrap, LatLon=LatLon, **LatLon_kwds) except (TypeError, ValueError) as x: raise _xError(x, start1=start1, end1=end1, start2=start2, end2=end2) def _intersect(start1, end1, start2, end2, height=None, wrap=False, # in.ellipsoidalBaseDI._intersect3 LatLon=None, **LatLon_kwds): # (INTERNAL) Intersect two (spherical) path, see L{intersection} # above, separated to allow callers to embellish any exceptions hs = [start1.height, start2.height] a1, b1 = start1.philam a2, b2 = start2.philam db, b2 = unrollPI(b1, b2, wrap=wrap) r12 = vincentys_(a2, a1, db) if abs(r12) < EPS: # [nearly] coincident points a, b = favg(a1, a2), favg(b1, b2) # see <https://www.EdWilliams.org/avform.htm#Intersection> elif isscalar(end1) and isscalar(end2): # both bearings sa1, ca1, sa2, ca2, sr12, cr12 = sincos2(a1, a2, r12) x1, x2 = (sr12 * ca1), (sr12 * ca2) if abs(x1) < EPS0 or abs(x2) < EPS0: raise IntersectionError(_parallel_) # handle domain error for equivalent longitudes, # see also functions asin_safe and acos_safe at # <https://www.EdWilliams.org/avform.htm#Math> t1, t2 = map1(acos1, (sa2 - sa1 * cr12) / x1, (sa1 - sa2 * cr12) / x2) if sin(db) > 0: t12, t21 = t1, PI2 - t2 else: t12, t21 = PI2 - t1, t2 t13, t23 = map1(radiansPI2, end1, end2) x1, x2 = map1(wrapPI, t13 - t12, # angle 2-1-3 t21 - t23) # angle 1-2-3 sx1, cx1, sx2, cx2 = sincos2(x1, x2) if sx1 == 0 and sx2 == 0: # max(abs(sx1), abs(sx2)) < EPS raise IntersectionError(_infinite_) sx3 = sx1 * sx2 # XXX if sx3 < 0: # XXX raise ValueError(_ambiguous_) x3 = acos1(cr12 * sx3 - cx2 * cx1) r13 = atan2(sr12 * sx3, cx2 + cx1 * cos(x3)) a, b = _destination2(a1, b1, r13, t13) # choose antipode for opposing bearings if _ib(a1, b1, end1, a, b, wrap) or \ _ib(a2, b2, end2, a, b, wrap): a, b = antipode_(a, b) # PYCHOK PhiLam2Tuple else: # end point(s) or bearing(s) x1, d1 = _i3d2(start1, end1, wrap, _1_, hs) x2, d2 = _i3d2(start2, end2, wrap, _2_, hs) x = x1.cross(x2) if x.length < EPS: # [nearly] colinear or parallel paths raise IntersectionError(_colinear_) a, b = x.philam # choose intersection similar to sphericalNvector d1 = _idot(d1, a1, b1, a, b, wrap) if d1: d2 = _idot(d2, a2, b2, a, b, wrap) if (d2 < 0 and d1 > 0) or (d2 > 0 and d1 < 0): a, b = antipode_(a, b) # PYCHOK PhiLam2Tuple h = fmean(hs) if height is None else Height(height) return _latlon3(degrees90(a), degrees180(b), h, intersection, LatLon, LatLon_kwds) def intersections2(center1, rad1, center2, rad2, radius=R_M, eps=_0_0, height=None, wrap=True, LatLon=LatLon, **LatLon_kwds): '''Compute the intersection points of two circles each defined by a center point and a radius. @arg center1: Center of the first circle (L{LatLon}). @arg rad1: Radius of the first circle (C{meter} or C{radians}, see B{C{radius}}). @arg center2: Center of the second circle (L{LatLon}). @arg rad2: Radius of the second circle (C{meter} or C{radians}, see B{C{radius}}). @kwarg radius: Mean earth radius (C{meter} or C{None} if B{C{rad1}}, B{C{rad2}} and B{C{eps}} are given in C{radians}). @kwarg eps: Required overlap (C{meter} or C{radians}, see B{C{radius}}). @kwarg height: Optional height for the intersection points (C{meter}, conventionally) or C{None} for the I{"radical height"} at the I{radical line} between both centers. @kwarg wrap: Wrap and unroll longitudes (C{bool}). @kwarg LatLon: Optional class to return the intersection points (L{LatLon}) or C{None}. @kwarg LatLon_kwds: Optional, additional B{C{LatLon}} keyword arguments, ignored if C{B{LatLon}=None}. @return: 2-Tuple of the intersection points, each a B{C{LatLon}} instance or if C{B{LatLon}=None} a L{LatLon3Tuple}C{(lat, lon, height)}. For abutting circles, both intersection points are the same instance. @raise IntersectionError: Concentric, antipodal, invalid or non-intersecting circles. @raise TypeError: If B{C{center1}} or B{C{center2}} not L{LatLon}. @raise ValueError: Invalid B{C{rad1}}, B{C{rad2}}, B{C{radius}}, B{C{eps}} or B{C{height}}. @note: Courtesy U{Samuel Čavoj<https://GitHub.com/mrJean1/PyGeodesy/issues/41>}. @see: This U{Answer<https://StackOverflow.com/questions/53324667/ find-intersection-coordinates-of-two-circles-on-earth/53331953>}. ''' c1 = _T00.others(center1=center1) c2 = _T00.others(center2=center2) try: return _intersects2(c1, rad1, c2, rad2, radius=radius, eps=eps, height=height, wrap=wrap, LatLon=LatLon, **LatLon_kwds) except (TypeError, ValueError) as x: raise _xError(x, center1=center1, rad1=rad1, center2=center2, rad2=rad2) def _intersects2(c1, rad1, c2, rad2, radius=R_M, eps=_0_0, # in .ellipsoidalBaseDI._intersects2 height=None, too_d=None, wrap=True, LatLon=LatLon, **LatLon_kwds): # (INTERNAL) Intersect two spherical circles, see L{intersections2} # above, separated to allow callers to embellish any exceptions def _dest3(bearing, h): a, b = _destination2(a1, b1, r1, bearing) return _latlon3(degrees90(a), degrees180(b), h, intersections2, LatLon, LatLon_kwds) r1, r2, f = _rads3(rad1, rad2, radius) if f: # swapped c1, c2 = c2, c1 # PYCHOK swap a1, b1 = c1.philam a2, b2 = c2.philam db, b2 = unrollPI(b1, b2, wrap=wrap) d = vincentys_(a2, a1, db) # radians if d < max(r1 - r2, EPS): raise IntersectionError(_near_concentric_) r = eps if radius is None else (m2radians( eps, radius=radius) if eps else _0_0) if r < _0_0: raise _ValueError(eps=r) x = fsum_(r1, r2, -d) # overlap if x > max(r, EPS): sd, cd, sr1, cr1, _, cr2 = sincos2(d, r1, r2) x = sd * sr1 if abs(x) < EPS0: raise _ValueError(_invalid_) x = acos1((cr2 - cd * cr1) / x) # 0 <= x <= PI elif x < r: t = (d * radius) if too_d is None else too_d raise IntersectionError(_too_(_Fmt.distant(t))) if height is None: # "radical height" f = _radical2(d, r1, r2).ratio h = Height(favg(c1.height, c2.height, f=f)) else: h = Height(height) b = bearing_(a1, b1, a2, b2, final=False, wrap=wrap) if x < _EPS4: # externally ... r = _dest3(b, h) elif x > _PI_EPS4: # internally ... r = _dest3(b + PI, h) else: return _dest3(b + x, h), _dest3(b - x, h) return r, r # ... abutting circles @deprecated_function def isPoleEnclosedBy(points, wrap=False): # PYCHOK no cover '''DEPRECATED, use function L{ispolar}. ''' return ispolar(points, wrap=wrap) def _latlon3(lat, lon, height, func, LatLon, LatLon_kwds): '''(INTERNAL) Helper for L{intersection}, L{intersections2} and L{meanOf}. ''' if LatLon is None: r = LatLon3Tuple(lat, lon, height) else: kwds = _xkwds(LatLon_kwds, height=height) r = LatLon(lat, lon, **kwds) return _xnamed(r, func.__name__) def meanOf(points, height=None, LatLon=LatLon, **LatLon_kwds): '''Compute the geographic mean of several points. @arg points: Points to be averaged (L{LatLon}[]). @kwarg height: Optional height at mean point, overriding the mean height (C{meter}). @kwarg LatLon: Optional class to return the mean point (L{LatLon}) or C{None}. @kwarg LatLon_kwds: Optional, additional B{C{LatLon}} keyword arguments, ignored if C{B{LatLon}=None}. @return: Point at geographic mean and height (B{C{LatLon}}) or a L{LatLon3Tuple}C{(lat, lon, height)} if B{C{LatLon}} is C{None}. @raise TypeError: Some B{C{points}} are not L{LatLon}. @raise ValueError: No B{C{points}} or invalid B{C{height}}. ''' # geographic mean m = sumOf(p._N_vector for p in _T00.PointsIter(points).iterate(closed=False)) lat, lon = m._N_vector.latlon if height is None: h = fmean(p.height for p in _T00.PointsIter(points).iterate(closed=False)) else: h = Height(height) return _latlon3(lat, lon, h, meanOf, LatLon, LatLon_kwds) @deprecated_function def nearestOn2(point, points, **closed_radius_LatLon_options): # PYCHOK no cover '''DEPRECATED, use function L{sphericalTrigonometry.nearestOn3}. @return: ... 2-tuple C{(closest, distance)} of the C{closest} point (L{LatLon}) on the polygon and the C{distance} between the C{closest} and the given B{C{point}}. The C{closest} is a B{C{LatLon}} or a L{LatLon2Tuple}C{(lat, lon)} if B{C{LatLon}} is C{None} ... ''' ll, d, _ = nearestOn3(point, points, **closed_radius_LatLon_options) if _xkwds_get(closed_radius_LatLon_options, LatLon=LatLon) is None: ll = LatLon2Tuple(ll.lat, ll.lon) return ll, d def nearestOn3(point, points, closed=False, radius=R_M, LatLon=LatLon, **options): '''Locate the point on a polygon closest to an other, reference point. Distances are approximated by function L{equirectangular_}, subject to the supplied B{C{options}}. @arg point: The other, reference point (L{LatLon}). @arg points: The polygon points (L{LatLon}[]). @kwarg closed: Optionally, close the polygon (C{bool}). @kwarg radius: Mean earth radius (C{meter}). @kwarg LatLon: Optional class to return the closest point (L{LatLon}) or C{None}. @kwarg options: Optional keyword arguments for function L{equirectangular_}. @return: A L{NearestOn3Tuple}C{(closest, distance, angle)} with the C{closest} point as B{C{LatLon}} or L{LatLon3Tuple}C{(lat, lon, height)} if B{C{LatLon}} is C{None}. The C{distance} is the L{equirectangular_} distance between the C{closest} and the given B{C{point}} in C{meter}, same units as B{C{radius}}. The C{angle} from the given B{C{point}} to the C{closest} is in compass C{degrees360}, like function L{compassAngle}. The C{height} is the (interpolated) height at the C{closest} point. @raise LimitError: Lat- and/or longitudinal delta exceeds the B{C{limit}}, see function L{equirectangular_}. @raise PointsError: Insufficient number of B{C{points}}. @raise TypeError: Some B{C{points}} are not C{LatLon}. @raise ValueError: Invalid B{C{radius}}. @see: Functions L{equirectangular_} and L{nearestOn5}. ''' lat, lon, d, c, h = _nearestOn5(point, points, closed=closed, LatLon=None, **options) r = LatLon3Tuple(lat, lon, h) if LatLon is None else \ LatLon(lat, lon, height=h) r = NearestOn3Tuple(r, degrees2m(d, radius=radius), c) return _xnamed(r, nearestOn3.__name__) def perimeterOf(points, closed=False, radius=R_M, wrap=True): '''Compute the perimeter of a (spherical) polygon (with great circle arcs joining the points). @arg points: The polygon points (L{LatLon}[]). @kwarg closed: Optionally, close the polygon (C{bool}). @kwarg radius: Mean earth radius (C{meter}) or C{None}. @kwarg wrap: Wrap and unroll longitudes (C{bool}). @return: Polygon perimeter (C{meter}, same units as B{C{radius}} or C{radians} if B{C{radius}} is C{None}). @raise PointsError: Insufficient number of B{C{points}}. @raise TypeError: Some B{C{points}} are not L{LatLon}. @raise ValueError: Invalid B{C{radius}}. @note: This perimeter is based on the L{haversine} formula. @see: L{pygeodesy.perimeterOf}, L{sphericalNvector.perimeterOf} and L{ellipsoidalKarney.perimeterOf}. ''' def _rads(Ps, closed, wrap): # angular edge lengths in radians a1, b1 = Ps[0].philam for i, p in Ps.enumerate(closed=closed): a2, b2 = p.philam db, b2 = unrollPI(b1, b2, wrap=wrap if i else False) yield vincentys_(a2, a1, db) a1, b1 = a2, b2 r = fsum(_rads(_T00.PointsIter(points, loop=1), closed, wrap)) return r if radius is None else (Radius(radius) * r) def _t8_7(t, radius): '''(INTERNAL) Convert a L{Triangle8Tuple} to L{Triangle7Tuple}. ''' if radius: # not in (None, _0_0) r = radius if isscalar(radius) else \ _ellipsoidal_datum(radius).ellipsoid.Rmean A, B, C = map1(degrees, t.A, t.B, t.C) t = Triangle7Tuple(A, (r * t.a), B, (r * t.b), C, (r * t.c), t.E * r**2) return t def triangle7(latA, lonA, latB, lonB, latC, lonC, radius=R_M, excess=excessAbc, wrap=False): '''Compute the angles, sides, and area of a (spherical) triangle. @arg latA: First corner latitude (C{degrees}). @arg lonA: First corner longitude (C{degrees}). @arg latB: Second corner latitude (C{degrees}). @arg lonB: Second corner longitude (C{degrees}). @arg latC: Third corner latitude (C{degrees}). @arg lonC: Third corner longitude (C{degrees}). @kwarg radius: Mean earth radius, ellipsoid or datum (C{meter}, L{Ellipsoid}, L{Ellipsoid2}, L{Datum} or L{a_f2Tuple}) or C{None}. @kwarg excess: I{Spherical excess} callable (L{excessAbc}, L{excessGirard} or L{excessLHuilier}). @kwarg wrap: Wrap and L{unroll180} longitudes (C{bool}). @return: A L{Triangle7Tuple}C{(A, a, B, b, C, c, area)} with spherical angles C{A}, C{B} and C{C}, angular sides C{a}, C{b} and C{c} all in C{degrees} and C{area} in I{square} C{meter} or units of B{C{radius}} I{squared} or if B{C{radius}} is C{None}, a L{Triangle8Tuple}C{(A, a, B, b, C, c, D, E)} all in C{radians} with I{spherical excess} C{E} as the C{unit area} in C{radians}. ''' t = triangle8_(Phi_(latA=latA), Lam_(lonA=lonA), Phi_(latB=latB), Lam_(lonB=lonB), Phi_(latC=latC), Lam_(lonC=lonC), excess=excess, wrap=wrap) return _t8_7(t, radius) def triangle8_(phiA, lamA, phiB, lamB, phiC, lamC, excess=excessAbc, wrap=False): '''Compute the angles, sides, I{spherical deficit} and I{spherical excess} of a (spherical) triangle. @arg phiA: First corner latitude (C{radians}). @arg lamA: First corner longitude (C{radians}). @arg phiB: Second corner latitude (C{radians}). @arg lamB: Second corner longitude (C{radians}). @arg phiC: Third corner latitude (C{radians}). @arg lamC: Third corner longitude (C{radians}). @kwarg excess: I{Spherical excess} callable (L{excessAbc}, L{excessGirard} or L{excessLHuilier}). @kwarg wrap: Wrap and L{unrollPI} longitudes (C{bool}). @return: A L{Triangle8Tuple}C{(A, a, B, b, C, c, D, E)} with spherical angles C{A}, C{B} and C{C}, angular sides C{a}, C{b} and C{c}, I{spherical deficit} C{D} and I{spherical excess} C{E}, all in C{radians}. ''' def _a_r(w, phiA, lamA, phiB, lamB, phiC, lamC): d, _ = unrollPI(lamB, lamC, wrap=w) a = vincentys_(phiC, phiB, d) return a, (phiB, lamB, phiC, lamC, phiA, lamA) def _A_r(a, sa, ca, sb, cb, sc, cc): s = sb * sc A = acos1((ca - cb * cc) / s) if abs(s) > EPS0 else a return A, (sb, cb, sc, cc, sa, ca) # rotate sincos2's # notation: side C{a} is oposite to corner C{A}, etc. a, r = _a_r(wrap, phiA, lamA, phiB, lamB, phiC, lamC) b, r = _a_r(wrap, *r) c, _ = _a_r(wrap, *r) A, r = _A_r(a, *sincos2(a, b, c)) B, r = _A_r(b, *r) C, _ = _A_r(c, *r) D = fsum_(PI2, -a, -b, -c) # deficit aka defect E = excessGirard(A, B, C) if excess in (excessGirard, True) else ( excessLHuilier(a, b, c) if excess in (excessLHuilier, False) else excessAbc(*max((A, b, c), (B, c, a), (C, a, b)))) return Triangle8Tuple(A, a, B, b, C, c, D, E) __all__ += _ALL_OTHER(Cartesian, LatLon, # classes areaOf, # functions intersection, intersections2, ispolar, isPoleEnclosedBy, # DEPRECATED, use ispolar meanOf, nearestOn2, nearestOn3, perimeterOf, sumOf, # == vector3d.sumOf triangle7, triangle8_) # **) MIT License # # Copyright (C) 2016-2021 -- 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.