# Coverage for pygeodesy/geohash.py : 95%

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Classes L{Geohash} and L{GeohashError} and several functions to encode, decode and inspect I{geohashes}. Transcoded from JavaScript originals by I{(C) Chris Veness 2011-2015} and published under the same MIT Licence**, see U{Geohashes <https://www.Movable-Type.co.UK/scripts/geohash.html>}. See also U{Geohash<https://WikiPedia.org/wiki/Geohash>}, U{Geohash<https://GitHub.com/vinsci/geohash>}, U{PyGeohash<https://PyPI.org/project/pygeohash>} and U{Geohash-Javascript<https://GitHub.com/DaveTroy/geohash-js>}. ''' from pygeodesy.basics import isstr, map2 from pygeodesy.dms import parse3llh # parseDMS2 from pygeodesy.errors import _ValueError, _xkwds from pygeodesy.fmath import favg from pygeodesy.formy import equirectangular_ as _equirectangular_, \ equirectangular, euclidean, haversine, vincentys from pygeodesy.interns import EPS, NN, R_M, _COMMA_, _DOT_, _E_, \ _floatuple, _N_, _NE_, _NW_, _S_, _SE_, \ _SW_, _W_, _0_0, _0_5, _180_0, _360_0 from pygeodesy.interns import _90_0 # PYCHOK used! from pygeodesy.lazily import _ALL_LAZY, _ALL_OTHER from pygeodesy.named import _NamedDict, _NamedTuple, nameof, _xnamed from pygeodesy.namedTuples import Bounds2Tuple, Bounds4Tuple, \ LatLon2Tuple, PhiLam2Tuple from pygeodesy.props import deprecated_function, deprecated_method, \ deprecated_property_RO, Property_RO from pygeodesy.streprs import fstr from pygeodesy.units import Degrees_, Int, Lat, Lon, Precision_, Str, \ _xStrError from math import ldexp, log10, radians __all__ = _ALL_LAZY.geohash __version__ = '21.05.26' class _GH(object): '''(INTERNAL) Lazily defined constants. ''' def _4d(self, n, e, s, w): # helper return dict(N=(n, e), S=(s, w), E=(e, n), W=(w, s)) @Property_RO def Borders(self): return self._4d('prxz', 'bcfguvyz', '028b', '0145hjnp') Bounds4 = (-_90_0, -_180_0, _90_0, _180_0) @Property_RO def DecodedBase32(self): # inverse GeohashBase32 map return dict((c, i) for i, c in enumerate(self.GeohashBase32)) # Geohash-specific base32 map GeohashBase32 = '0123456789bcdefghjkmnpqrstuvwxyz' # no a, i, j and o @Property_RO def Neighbors(self): return self._4d('p0r21436x8zb9dcf5h7kjnmqesgutwvy', 'bc01fg45238967deuvhjyznpkmstqrwx', '14365h7k9dcfesgujnmqp0r2twvyx8zb', '238967debc01fg45kmstqrwxuvhjyznp') @Property_RO def Sizes(self): # lat-, lon and radial size (in meter) # ... where radial = sqrt(latSize * lonWidth / PI) return (_floatuple(20032e3, 20000e3, 11292815.096), # 0 _floatuple( 5003e3, 5000e3, 2821794.075), # 1 _floatuple( 650e3, 1225e3, 503442.397), # 2 _floatuple( 156e3, 156e3, 88013.575), # 3 _floatuple( 19500, 39100, 15578.683), # 4 _floatuple( 4890, 4890, 2758.887), # 5 _floatuple( 610, 1220, 486.710), # 6 _floatuple( 153, 153, 86.321), # 7 _floatuple( 19.1, 38.2, 15.239), # 8 _floatuple( 4.77, 4.77, 2.691), # 9 _floatuple( 0.596, 1.19, 0.475), # 10 _floatuple( 0.149, 0.149, 0.084), # 11 _floatuple( 0.0186, 0.0372, 0.015)) # 12 _MaxPrec _GH = _GH() # PYCHOK singleton _MaxPrec = 12 def _2bounds(LatLon, LatLon_kwds, s, w, n, e, name=NN): '''(INTERNAL) Return SW and NE bounds. ''' if LatLon is None: r = Bounds4Tuple(s, w, n, e, name=name) else: sw = _xnamed(LatLon(s, w, **LatLon_kwds), name) ne = _xnamed(LatLon(n, e, **LatLon_kwds), name) r = Bounds2Tuple(sw, ne, name=name) return r # _xnamed(r, name) def _2center(bounds): '''(INTERNAL) Return the C{bounds} center. ''' return (favg(bounds.latN, bounds.latS), favg(bounds.lonE, bounds.lonW)) def _2fll(lat, lon, *unused): '''(INTERNAL) Convert lat, lon to 2-tuple of floats. ''' # lat, lon = parseDMS2(lat, lon) return (Lat(lat, Error=GeohashError), Lon(lon, Error=GeohashError)) def _2Geohash(geohash): '''(INTERNAL) Check or create a Geohash instance. ''' return geohash if isinstance(geohash, Geohash) else \ Geohash(geohash) def _2geostr(geohash): '''(INTERNAL) Check a geohash string. ''' try: if not (0 < len(geohash) <= _MaxPrec): raise ValueError geostr = geohash.lower() for c in geostr: if c not in _GH.DecodedBase32: raise ValueError return geostr except (AttributeError, TypeError, ValueError) as x: raise GeohashError(Geohash.__name__, geohash, txt=str(x)) class Geohash(Str): '''Geohash class, a named C{str}. ''' # no str.__init__ in Python 3 def __new__(cls, cll, precision=None, name=NN): '''New L{Geohash} from an other L{Geohash} instance or C{str} or from a C{LatLon} instance or C{str}. @arg cll: Cell or location (L{Geohash}, C{LatLon} or C{str}). @kwarg precision: Optional, the desired geohash length (C{int} 1..12), see function L{geohash.encode} for some examples. @kwarg name: Optional name (C{str}). @return: New L{Geohash}. @raise GeohashError: INValid or non-alphanumeric B{C{cll}}. @raise TypeError: Invalid B{C{cll}}. ''' ll = None if isinstance(cll, Geohash): gh = _2geostr(str(cll)) elif isstr(cll): if _COMMA_ in cll: ll = _2fll(*parse3llh(cll)) gh = encode(*ll, precision=precision) else: gh = _2geostr(cll) else: # assume LatLon try: ll = _2fll(cll.lat, cll.lon) gh = encode(*ll, precision=precision) except AttributeError: raise _xStrError(Geohash, cll=cll, Error=GeohashError) self = Str.__new__(cls, gh, name=name or nameof(cll)) self._latlon = ll return self @deprecated_property_RO def ab(self): '''DEPRECATED, use property C{philam}.''' return self.philam def adjacent(self, direction, name=NN): '''Determine the adjacent cell in given compass direction. @arg direction: Compass direction ('N', 'S', 'E' or 'W'). @kwarg name: Optional name (C{str}), otherwise the name of this cell plus C{.D}irection. @return: Geohash of adjacent cell (L{Geohash}). @raise GeohashError: Invalid geohash or B{C{direction}}. ''' # based on <https://GitHub.com/DaveTroy/geohash-js> D = direction[:1].upper() if D not in _GH.Neighbors: raise GeohashError(direction=direction) e = len(self) & 1 # % 2 c = self[-1:] # last hash char i = _GH.Neighbors[D][e].find(c) if i < 0: raise GeohashError(geohash=self) p = self[:-1] # hash without last char # check for edge-cases which don't share common prefix if p and (c in _GH.Borders[D][e]): p = Geohash(p).adjacent(D) n = name or self.name if n: n = _DOT_(n, D) # append letter for direction to parent return Geohash(p + _GH.GeohashBase32[i], name=n) @Property_RO def _bounds(self): '''(INTERNAL) Cache for L{bounds}. ''' return bounds(self) def bounds(self, LatLon=None, **LatLon_kwds): '''Return the lower-left SW and upper-right NE bounds of this geohash cell. @kwarg LatLon: Optional class to return I{bounds} (C{LatLon}) or C{None}. @kwarg LatLon_kwds: Optional keyword arguments for B{C{LatLon}}, ignored if B{C{LatLon}} is C{None}. @return: A L{Bounds2Tuple}C{(latlonSW, latlonNE)} of B{C{LatLon}}s or a L{Bounds4Tuple}C{(latS, lonW, latN, lonE)} if C{B{LatLon}=None}, ''' r = self._bounds return r if LatLon is None else \ _2bounds(LatLon, LatLon_kwds, *r, name=self.name) def _distanceTo(self, func_, other, **kwds): '''(INTERNAL) Helper for distances, see C{formy._distanceTo*}. ''' lls = self.latlon + _2Geohash(other).latlon return func_(*lls, **kwds) def distanceTo(self, other): '''Estimate the distance between this and an other geohash based the cell sizes. @arg other: The other geohash (L{Geohash}, C{LatLon} or C{str}). @return: Approximate distance (C{meter}). @raise TypeError: The B{C{other}} is not a L{Geohash}, C{LatLon} or C{str}. ''' other = _2Geohash(other) n = min(len(self), len(other), len(_GH.Sizes)) if n: for n in range(n): if self[n] != other[n]: break return _GH.Sizes[n][2] @deprecated_method def distance1To(self, other): # PYCHOK no cover '''DEPRECATED, use method L{distanceTo}.''' return self.distanceTo(other) distance1 = distance1To @deprecated_method def distance2To(self, other, radius=R_M, adjust=False, wrap=False): # PYCHOK no cover '''DEPRECATED, use method L{equirectangularTo}.''' return self.equirectangularTo(other, radius=radius, adjust=adjust, wrap=wrap) distance2 = distance2To @deprecated_method def distance3To(self, other, radius=R_M, wrap=False): # PYCHOK no cover '''DEPRECATED, use method L{haversineTo}.''' return self.haversineTo(other, radius=radius, wrap=wrap) distance3 = distance3To def equirectangularTo(self, other, radius=R_M, adjust=False, wrap=False): '''Approximate the distance between this and an other geohash using the L{equirectangular} function. @arg other: The other geohash (L{Geohash}, C{LatLon} or C{str}). @kwarg radius: Mean earth radius, ellipsoid or datum (C{meter}, L{Ellipsoid}, L{Ellipsoid2}, L{Datum} or L{a_f2Tuple}) or C{None}. @kwarg adjust: Adjust the wrapped, unrolled longitudinal delta by the cosine of the mean latitude C{bool}). @kwarg wrap: Wrap and unroll longitudes (C{bool}). @return: Distance (C{meter}, same units as B{C{radius}} or the ellipsoid or datum axes or C{radians I{squared}} if B{C{radius}} is C{None} or C{0}). @raise TypeError: The B{C{other}} is not a L{Geohash}, C{LatLon} or C{str} or invalid B{C{radius}}. @see: U{Local, flat earth approximation <https://www.EdWilliams.org/avform.htm#flat>}, functions ''' lls = self.latlon + _2Geohash(other).latlon kwds = dict(adjust=adjust, limit=None, wrap=wrap) return equirectangular( *lls, radius=radius, **kwds) if radius else \ _equirectangular_(*lls, **kwds).distance2 def euclideanTo(self, other, radius=R_M, adjust=False, wrap=False): '''Approximate the distance between this and an other geohash using the L{euclidean} function. @arg other: The other geohash (L{Geohash}, C{LatLon} or C{str}). @kwarg radius: Mean earth radius, ellipsoid or datum (C{meter}, L{Ellipsoid}, L{Ellipsoid2}, L{Datum} or L{a_f2Tuple}). @kwarg adjust: Adjust the wrapped, unrolled longitudinal delta by the cosine of the mean latitude C{bool}). @kwarg wrap: Wrap and unroll longitudes (C{bool}). @return: Distance (C{meter}, same units as B{C{radius}} or the ellipsoid or datum axes). @raise TypeError: The B{C{other}} is not a L{Geohash}, C{LatLon} or C{str} or invalid B{C{radius}}. ''' return self._distanceTo(euclidean, other, radius=radius, adjust=adjust, wrap=wrap) def haversineTo(self, other, radius=R_M, wrap=False): '''Compute the distance between this and an other geohash using the L{haversine} formula. @arg other: The other geohash (L{Geohash}, C{LatLon} or C{str}). @kwarg radius: Mean earth radius, ellipsoid or datum (C{meter}, L{Ellipsoid}, L{Ellipsoid2}, L{Datum} or L{a_f2Tuple}). @kwarg wrap: Wrap and unroll longitudes (C{bool}). @return: Distance (C{meter}, same units as B{C{radius}} or the ellipsoid or datum axes). @raise TypeError: The B{C{other}} is not a L{Geohash}, C{LatLon} or C{str} or invalid B{C{radius}}. ''' return self._distanceTo(haversine, other, radius=radius, wrap=wrap) @Property_RO def latlon(self): '''Get the lat- and longitude of (the approximate center of) this geohash as a L{LatLon2Tuple}C{(lat, lon)} in C{degrees}. @example: >>> geohash.Geohash('geek').latlon # 65.478515625, -17.75390625 >>> geohash.decode('geek') # '65.48', '-17.75' ''' lat, lon = self._latlon or _2center(self.bounds()) return LatLon2Tuple(lat, lon, name=self.name) @Property_RO def neighbors(self): '''Get all 8 adjacent cells as a L{Neighbors8Dict}C{(N, NE, E, SE, S, SW, W, NW)} of L{Geohash}es. @JSname: I{neighbours}. ''' return Neighbors8Dict(N=self.N, NE=self.NE, E=self.E, SE=self.SE, S=self.S, SW=self.SW, W=self.W, NW=self.NW, name=self.name) @Property_RO def philam(self): '''Get the lat- and longitude of (the approximate center of) this geohash as a L{PhiLam2Tuple}C{(phi, lam)} in C{radians}. ''' return PhiLam2Tuple(*map2(radians, self.latlon), name=self.name) @Property_RO def precision(self): '''Get this geohash's precision (C{int}). ''' return len(self) @Property_RO def sizes(self): '''Get the lat- and longitudinal size of this cell as a L{LatLon2Tuple}C{(lat, lon)} in (C{meter}). ''' z = _GH.Sizes n = min(len(z) - 1, max(self.precision, 1)) return LatLon2Tuple(*z[n][:2], name=self.name) # XXX Height, Width? def toLatLon(self, LatLon=None, **LatLon_kwds): '''Return (the approximate center of) this geohash cell as an instance of the supplied C{LatLon} class. @arg LatLon: Class to use (C{LatLon}) or C{None}. @kwarg LatLon_kwds: Optional, additional B{C{LatLon}} keyword arguments, ignored if C{B{LatLon}=None}. @return: This geohash location (B{C{LatLon}}) or a L{LatLon2Tuple}C{(lat, lon)} if B{C{LatLon}} is C{None}. @raise TypeError: Invalid B{C{LatLon}} or B{C{LatLon_kwds}}. @example: >>> from sphericalTrigonometry import LatLon >>> ll = Geohash('u120fxw').toLatLon(LatLon) >>> print(repr(ll)) # LatLon(52°12′17.9″N, 000°07′07.64″E) >>> print(ll) # 52.204971°N, 000.11879°E ''' return self.latlon if LatLon is None else _xnamed(LatLon( *self.latlon, **LatLon_kwds), self.name) def vincentysTo(self, other, radius=R_M, wrap=False): '''Compute the distance between this and an other geohash using the L{vincentys} formula. @arg other: The other geohash (L{Geohash}, C{LatLon} or C{str}). @kwarg radius: Mean earth radius, ellipsoid or datum (C{meter}, L{Ellipsoid}, L{Ellipsoid2}, L{Datum} or L{a_f2Tuple}). @kwarg wrap: Wrap and unroll longitudes (C{bool}). @return: Distance (C{meter}, same units as B{C{radius}} or the ellipsoid or datum axes). @raise TypeError: The B{C{other}} is not a L{Geohash}, C{LatLon} or C{str} or invalid B{C{radius}}. ''' return self._distanceTo(vincentys, other, radius=radius, wrap=wrap) @Property_RO def N(self): '''Get the cell North of this (L{Geohash}). ''' return self.adjacent(_N_) @Property_RO def S(self): '''Get the cell South of this (L{Geohash}). ''' return self.adjacent(_S_) @Property_RO def E(self): '''Get the cell East of this (L{Geohash}). ''' return self.adjacent(_E_) @Property_RO def W(self): '''Get the cell West of this (L{Geohash}). ''' return self.adjacent(_W_) @Property_RO def NE(self): '''Get the cell NorthEast of this (L{Geohash}). ''' return self.N.E @Property_RO def NW(self): '''Get the cell NorthWest of this (L{Geohash}). ''' return self.N.W @Property_RO def SE(self): '''Get the cell SouthEast of this (L{Geohash}). ''' return self.S.E @Property_RO def SW(self): '''Get the cell SouthWest of this (L{Geohash}). ''' return self.S.W class GeohashError(_ValueError): '''Geohash encode, decode or other L{Geohash} issue. ''' pass class Neighbors8Dict(_NamedDict): '''8-Dict C{(N, NE, E, SE, S, SW, W, NW)} of L{Geohash}es, providing key I{and} attribute access to the items. ''' _Keys_ = (_N_, _NE_, _E_, _SE_, _S_, _SW_, _W_, _NW_) def __init__(self, **kwds): # PYCHOK no *args kwds = _xkwds(kwds, **_Neighbors8Defaults) _NamedDict.__init__(self, **kwds) # name=... _Neighbors8Defaults = dict(zip(Neighbors8Dict._Keys_, (None,) * len(Neighbors8Dict._Keys_))) # XXX frozendict def bounds(geohash, LatLon=None, **LatLon_kwds): '''Returns the lower-left SW and upper-right NE corners of a geohash. @arg geohash: To be bound (L{Geohash}). @kwarg LatLon: Optional class to return the bounds (C{LatLon}) or C{None}. @kwarg LatLon_kwds: Optional keyword arguments for B{C{LatLon}}, ignored if C{B{LatLon}=None}. @return: A L{Bounds2Tuple}C{(latlonSW, latlonNE)} of B{C{LatLon}}s or if B{C{LatLon}} is C{None}, a L{Bounds4Tuple}C{(latS, lonW, latN, lonE)}. @raise TypeError: The B{C{geohash}} is not a L{Geohash}, C{LatLon} or C{str} or invalid B{C{LatLon}} or invalid B{C{LatLon_kwds}}. @raise GeohashError: Invalid or C{null} B{C{geohash}}. @example: >>> geohash.bounds('u120fxw') # 52.20428467, 0.11810303, 52.20565796, 0.11947632 >>> geohash.decode('u120fxw') # '52.205', '0.1188' ''' gh = _2Geohash(geohash) if len(gh) < 1: raise GeohashError(geohash=geohash) s, w, n, e = _GH.Bounds4 try: d = True for c in gh.lower(): i = _GH.DecodedBase32[c] for m in (16, 8, 4, 2, 1): if d: # longitude if i & m: w = favg(w, e) else: e = favg(w, e) else: # latitude if i & m: s = favg(s, n) else: n = favg(s, n) d = not d except KeyError: raise GeohashError(geohash=geohash) return _2bounds(LatLon, LatLon_kwds, s, w, n, e, name=nameof(geohash)) def _bounds3(geohash): '''(INTERNAL) Return 3-tuple C{(bounds, height, width)}. ''' b = bounds(geohash) return b, (b.latN - b.latS), (b.lonE - b.lonW) def decode(geohash): '''Decode a geohash to lat-/longitude of the (approximate centre of) geohash cell to reasonable precision. @arg geohash: To be decoded (L{Geohash}). @return: 2-Tuple C{(latStr, lonStr)}, both C{str}. @raise TypeError: The B{C{geohash}} is not a L{Geohash}, C{LatLon} or C{str}. @raise GeohashError: Invalid or null B{C{geohash}}. @example: >>> geohash.decode('u120fxw') # '52.205', '0.1188' >>> geohash.decode('sunny') # '23.708', '42.473' Saudi Arabia >>> geohash.decode('fur') # '69.6', '-45.7' Greenland >>> geohash.decode('reef') # '-24.87', '162.95' Coral Sea >>> geohash.decode('geek') # '65.48', '-17.75' Iceland ''' b, h, w = _bounds3(geohash) lat, lon = _2center(b) # round to near centre without excessive precision to # ⌊2-log10(Δ°)⌋ decimal places, strip trailing zeros return (fstr(lat, prec=int(2 - log10(h))), fstr(lon, prec=int(2 - log10(w)))) # strs! def decode2(geohash, LatLon=None, **LatLon_kwds): '''Decode a geohash to lat-/longitude of the (approximate centre of) geohash cell to reasonable precision. @arg geohash: To be decoded (L{Geohash}). @kwarg LatLon: Optional class to return the location (C{LatLon}) or C{None}. @kwarg LatLon_kwds: Optional keyword arguments for B{C{LatLon}}, ignored if C{B{LatLon}=None}. @return: L{LatLon2Tuple}C{(lat, lon)}, both C{degrees} if C{B{LatLon}=None}, otherwise a B{C{LatLon}} instance. @raise TypeError: The B{C{geohash}} is not a L{Geohash}, C{LatLon} or C{str}. @raise GeohashError: Invalid or null B{C{geohash}}. ''' t = map2(float, decode(geohash)) r = LatLon2Tuple(*t) if LatLon is None else LatLon(*t, **LatLon_kwds) return _xnamed(r, decode2.__name__) def decode_error(geohash): '''Return the relative lat-/longitude decoding errors for this geohash. @arg geohash: To be decoded (L{Geohash}). @return: A L{LatLon2Tuple}C{(lat, lon)} with the lat- and longitudinal errors in (C{degrees}). @raise TypeError: The B{C{geohash}} is not a L{Geohash}, C{LatLon} or C{str}. @raise GeohashError: Invalid or null B{C{geohash}}. @example: >>> geohash.decode_error('u120fxw') # 0.00068665, 0.00068665 >>> geohash.decode_error('fur') # 0.703125, 0.703125 >>> geohash.decode_error('fu') # 2.8125, 5.625 >>> geohash.decode_error('f') # 22.5, 22.5 ''' _, h, w = _bounds3(geohash) return LatLon2Tuple(h * _0_5, # Height error w * _0_5) # Width error def distance_(geohash1, geohash2): '''Estimate the distance between two geohash (from the cell sizes). @arg geohash1: First geohash (L{Geohash}, C{LatLon} or C{str}). @arg geohash2: Second geohash (L{Geohash}, C{LatLon} or C{str}). @return: Approximate distance (C{meter}). @raise TypeError: If B{C{geohash1}} or B{C{geohash2}} is not a L{Geohash}, C{LatLon} or C{str}. @example: >>> geohash.distance_('u120fxwsh', 'u120fxws0') # 15.239 ''' return _2Geohash(geohash1).distanceTo(geohash2) @deprecated_function def distance1(geohash1, geohash2): '''DEPRECATED, used L{geohash.distance_}.''' return distance_(geohash1, geohash2) @deprecated_function def distance2(geohash1, geohash2): '''DEPRECATED, used L{geohash.equirectangular_}.''' return equirectangular_(geohash1, geohash2) @deprecated_function def distance3(geohash1, geohash2): '''DEPRECATED, used L{geohash.haversine_}.''' return haversine_(geohash1, geohash2) def encode(lat, lon, precision=None): '''Encode a lat-/longitude as a C{geohash}, either to the specified precision or if not provided, to an automatically evaluated precision. @arg lat: Latitude (C{degrees}). @arg lon: Longitude (C{degrees}). @kwarg precision: Optional, the desired geohash length (C{int} 1..12). @return: The C{geohash} (C{str}). @raise GeohashError: Invalid B{C{lat}}, B{C{lon}} or B{C{precision}}. @example: >>> geohash.encode(52.205, 0.119, 7) # 'u120fxw' >>> geohash.encode(52.205, 0.119, 12) # 'u120fxwshvkg' >>> geohash.encode(52.205, 0.1188, 12) # 'u120fxws0jre' >>> geohash.encode(52.205, 0.1188) # 'u120fxw' >>> geohash.encode( 0, 0) # 's00000000000' ''' lat, lon = _2fll(lat, lon) if precision is None: # Infer precision by refining geohash until # it matches precision of supplied lat/lon. for p in range(1, _MaxPrec + 1): gh = encode(lat, lon, p) ll = map2(float, decode(gh)) if abs(lat - ll[0]) < EPS and \ abs(lon - ll[1]) < EPS: return gh p = _MaxPrec else: p = Precision_(precision, Error=GeohashError, low=1, high=_MaxPrec) b = i = 0 d, gh = True, [] s, w, n, e = _GH.Bounds4 while p > 0: i += i if d: # bisect longitude m = favg(e, w) if lon < m: e = m else: w = m i += 1 else: # bisect latitude m = favg(n, s) if lat < m: n = m else: s = m i += 1 d = not d b += 1 if b == 5: # 5 bits gives a character: # append it and start over gh.append(_GH.GeohashBase32[i]) b = i = 0 p -= 1 return NN.join(gh) def equirectangular_(geohash1, geohash2, radius=R_M): '''Approximate the distance between two geohashes using the L{equirectangular} formula. @arg geohash1: First geohash (L{Geohash}, C{LatLon} or C{str}). @arg geohash2: Second geohash (L{Geohash}, C{LatLon} or C{str}). @kwarg radius: Mean earth radius (C{meter}) or C{None}. @return: Approximate distance (C{meter}, same units as B{C{radius}}). @raise TypeError: If B{C{geohash1}} or B{C{geohash2}} is not a L{Geohash}, C{LatLon} or C{str}. @example: >>> geohash.equirectangular_('u120fxwsh', 'u120fxws0') # 19.0879 ''' return _2Geohash(geohash1).equirectangularTo(geohash2, radius=radius) def haversine_(geohash1, geohash2, radius=R_M): '''Compute the great-circle distance between two geohashes using the L{haversine} formula. @arg geohash1: First geohash (L{Geohash}, C{LatLon} or C{str}). @arg geohash2: Second geohash (L{Geohash}, C{LatLon} or C{str}). @kwarg radius: Mean earth radius (C{meter}). @return: Great-circle distance (C{meter}, same units as B{C{radius}}). @raise TypeError: If B{C{geohash1}} or B{C{geohash2}} is not a L{Geohash}, C{LatLon} or C{str}. @example: >>> geohash.haversine_('u120fxwsh', 'u120fxws0') # 11.6978 ''' return _2Geohash(geohash1).haversineTo(geohash2, radius=radius) def neighbors(geohash): '''Return the L{Geohash}es for all 8 adjacent cells. @arg geohash: Cell for which neighbors are requested (L{Geohash} or C{str}). @return: A L{Neighbors8Dict}C{(N, NE, E, SE, S, SW, W, NW)} of L{Geohash}es. @raise TypeError: The B{C{geohash}} is not a L{Geohash}, C{LatLon} or C{str}. @JSname: I{neighbours}. ''' return _2Geohash(geohash).neighbors def precision(res1, res2=None): '''Determine the L{Geohash} precisions to meet a or both given (geographic) resolutions. @arg res1: The required primary I{(longitudinal)} resolution (C{degrees}). @kwarg res2: Optional, required secondary I{(latitudinal)} resolution (C{degrees}). @return: The L{Geohash} precision or length (C{int}, 1..12). @raise GeohashError: Invalid B{C{res1}} or B{C{res2}}. @see: C++ class U{Geohash <https://GeographicLib.SourceForge.io/html/classGeographicLib_1_1Geohash.html>}. ''' r = Degrees_(res1=res1, low=_0_0, Error=GeohashError) if res2 is None: t = r, r for p in range(1, _MaxPrec): if resolution2(p, None) <= t: return p else: t = r, Degrees_(res2=res2, low=_0_0, Error=GeohashError) for p in range(1, _MaxPrec): if resolution2(p, p) <= t: return p return _MaxPrec class Resolutions2Tuple(_NamedTuple): '''2-Tuple C{(res1, res2)} with the primary I{(longitudinal)} and secondary I{(latitudinal)} resolution, both in C{degrees}. ''' _Names_ = ('res1', 'res2') _Units_ = ( Degrees_, Degrees_) def resolution2(prec1, prec2=None): '''Determine the (geographic) resolutions of given L{Geohash} precisions. @arg prec1: The given primary I{(longitudinal)} precision (C{int} 1..12). @kwarg prec2: Optional, secondary I{(latitudinal)} precision (C{int} 1..12). @return: L{Resolutions2Tuple}C{(res1, res2)} with the (geographic) resolutions C{degrees}, where C{res2} B{C{is}} C{res1} if no B{C{prec2}} is given. @raise GeohashError: Invalid B{C{prec1}} or B{C{prec2}}. @see: I{Karney}'s C++ class U{Geohash <https://GeographicLib.SourceForge.io/html/classGeographicLib_1_1Geohash.html>}. ''' res1, res2 = _360_0, _180_0 # note ... lon, lat! if prec1: p = 5 * max(0, min(Int(prec1=prec1, Error=GeohashError), _MaxPrec)) res1 = res2 = ldexp(res1, -(p - p // 2)) if prec2: p = 5 * max(0, min(Int(prec2=prec2, Error=GeohashError), _MaxPrec)) res2 = ldexp(res2, -(p // 2)) return Resolutions2Tuple(res1, res2) def sizes(geohash): '''Return the lat- and longitudinal size of this L{Geohash} cell. @arg geohash: Cell for which size are required (L{Geohash} or C{str}). @return: A L{LatLon2Tuple}C{(lat, lon)} with the latitudinal height and longitudinal width in (C{meter}). @raise TypeError: The B{C{geohash}} is not a L{Geohash}, C{LatLon} or C{str}. ''' return _2Geohash(geohash).sizes __all__ += _ALL_OTHER(bounds, # functions decode, decode2, decode_error, distance_, encode, equirectangular_, haversine_, neighbors, precision, resolution2, sizes) # **) 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.