# Coverage for pygeodesy/geohash.py : 96%

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1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211 212 213 214 215 216 217 218 219 220 221 222 223 224 225 226 227 228 229 230 231 232 233 234 235 236 237 238 239 240 241 242 243 244 245 246 247 248 249 250 251 252 253 254 255 256 257 258 259 260 261 262 263 264 265 266 267 268 269 270 271 272 273 274 275 276 277 278 279 280 281 282 283 284 285 286 287 288 289 290 291 292 293 294 295 296 297 298 299 300 301 302 303 304 305 306 307 308 309 310 311 312 313 314 315 316 317 318 319 320 321 322 323 324 325 326 327 328 329 330 331 332 333 334 335 336 337 338 339 340 341 342 343 344 345 346 347 348 349 350 351 352 353 354 355 356 357 358 359 360 361 362 363 364 365 366 367 368 369 370 371 372 373 374 375 376 377 378 379 380 381 382 383 384 385 386 387 388 389 390 391 392 393 394 395 396 397 398 399 400 401 402 403 404 405 406 407 408 409 410 411 412 413 414 415 416 417 418 419 420 421 422 423 424 425 426 427 428 429 430 431 432 433 434 435 436 437 438 439 440 441 442 443 444 445 446 447 448 449 450 451 452 453 454 455 456 457 458 459 460 461 462 463 464 465 466 467 468 469 470 471 472 473 474 475 476 477 478 479 480 481 482 483 484 485 486 487 488 489 490 491 492 493 494 495 496 497 498 499 500 501 502 503 504 505 506 507 508 509 510 511 512 513 514 515 516 517 518 519 520 521 522 523 524 525 526 527 528 529 530 531 532 533 534 535 536 537 538 539 540 541 542 543 544 545 546 547 548 549 550 551 552 553 554 555 556 557 558 559 560 561 562 563 564 565 566 567 568 569 570 571 572 573 574 575 576 577 578 579 580 581 582 583 584 585 586 587 588 589 590 591 592 593 594 595 596 597 598 599 600 601 602 603 604 605 606 607 608 609 610 611 612 613 614 615 616 617 618 619 620 621 622 623 624 625 626 627 628 629 630 631 632 633 634 635 636 637 638 639 640 641 642 643 644 645 646 647 648 649 650 651 652 653 654 655 656 657 658 659 660 661 662 663 664 665 666 667 668 669 670 671 672 673 674 675 676 677 678 679 680 681 682 683 684 685 686 687 688 689 690 691 692 693 694 695 696 697 698 699 700 701 702 703 704 705 706 707 708 709 710 711 712 713 714 715 716 717 718 719 720 721 722 723 724 725 726 727 728 729 730 731 732 733 734 735 736 737 738 739 740 741 742 743 744 745 746 747 748 749 750 751 752 753 754 755 756 757 758 759 760 761 762 763 764 765 766 767 768 769 770 771 772 773 774 775 776 777 778 779 780 781 782 783 784 785 786 787 | # -*- coding: utf-8 -*- u'''Classes L{Geohash} and L{GeohashError} and several functions to encode, decode and inspect I{geohashes}. Transcribed 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>}. @newfield example: Example, Examples ''' from pygeodesy.basics import EPS, R_M, _isnotError, isstr, map2, \ property_RO from pygeodesy.dms import parse3llh, parseDMS2 from pygeodesy.fmath import favg from pygeodesy.formy import equirectangular, equirectangular_, haversine_ from pygeodesy.lazily import _ALL_LAZY from pygeodesy.named import Bounds2Tuple, Bounds4Tuple, LatLon2Tuple, \ _NamedStr, Neighbors8Dict from pygeodesy.streprs import fstr from pygeodesy.utily import unrollPI from math import ldexp, log10, radians # all public contants, classes and functions __all__ = _ALL_LAZY.geohash + ('bounds', # functions 'decode', 'decode_error', 'distance1', 'distance2', 'distance3', 'encode', 'neighbors', 'precision', 'resolution2', 'sizes') __version__ = '20.03.23' _Border = dict( N=('prxz', 'bcfguvyz'), S=('028b', '0145hjnp'), E=('bcfguvyz', 'prxz'), W=('0145hjnp', '028b')) _Bounds4 = -90, -180, 90, 180 _MaxPrec = 12 _Neighbor = dict( N=('p0r21436x8zb9dcf5h7kjnmqesgutwvy', 'bc01fg45238967deuvhjyznpkmstqrwx'), S=('14365h7k9dcfesgujnmqp0r2twvyx8zb', '238967debc01fg45kmstqrwxuvhjyznp'), E=('bc01fg45238967deuvhjyznpkmstqrwx', 'p0r21436x8zb9dcf5h7kjnmqesgutwvy'), W=('238967debc01fg45kmstqrwxuvhjyznp', '14365h7k9dcfesgujnmqp0r2twvyx8zb')) # lat-, longitudinal and radial cell size (in meter) _Sizes = ( # radius = sqrt(latHeight * lonWidth / PI) (20032e3, 20000e3, 11292815.096), # 0 ( 5003e3, 5000e3, 2821794.075), # 1 ( 650e3, 1225e3, 503442.397), # 2 ( 156e3, 156e3, 88013.575), # 3 ( 19500, 39100, 15578.683), # 4 ( 4890, 4890, 2758.887), # 5 ( 610, 1220, 486.710), # 6 ( 153, 153, 86.321), # 7 ( 19.1, 38.2, 15.239), # 8 ( 4.77, 4.77, 2.691), # 9 ( 0.596, 1.19, 0.475), # 10 ( 0.149, 0.149, 0.084), # 11 ( 0.0186, 0.0372, 0.015)) # 12 _MaxPrec # Geohash-specific base32 map _GeohashBase32 = '0123456789bcdefghjkmnpqrstuvwxyz' # no a, i, j and o # ... and the inverse map _DecodedBase32 = dict((c, i) for i, c in enumerate(_GeohashBase32)) c = i = None del c, i def _2bounds(LatLon, LatLon_kwds, s, w, n, e): '''(INTERNAL) return SW and NE bounds. ''' return Bounds4Tuple(s, w, n, e) if LatLon is None else ( Bounds2Tuple(LatLon(s, w, **LatLon_kwds), LatLon(n, e, **LatLon_kwds))) # PYCHOK inconsistent def _2fll(lat, lon, *unused): '''(INTERNAL) Convert lat, lon to 2-tuple of floats. ''' return parseDMS2(lat, lon) def _2Geohash(geohash): '''(INTERNAL) Check or create a Geohash instance. ''' if not isinstance(geohash, Geohash): try: geohash = Geohash(geohash) except (TypeError, ValueError): raise _isnotError(Geohash.__name__, str.__name__, 'LatLon', geohash=geohash) return 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 _DecodedBase32: raise ValueError except (AttributeError, TypeError, ValueError): raise GeohashError('%s: %r[%s]' % (Geohash.__name__, geohash, len(geohash))) return geostr class GeohashError(ValueError): '''Geohash encode, decode or other L{Geohash} issue. ''' pass class Geohash(_NamedStr): '''Geohash class, a L{_NamedStr}. ''' _bounds = None # cached bounds property _latlon = None # cached latlon property _N = None # cached neighbors properties _E = None _S = None _W = None # no str.__init__ in Python 3 def __new__(cls, cll, precision=None, name=''): '''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} or C{str}, 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 TypeError: Invalid B{C{cll}}. @raise GeohashError: INValid or non-alphanumeric B{C{cll}}. ''' if isinstance(cll, Geohash): gh = _2geostr(str(cll)) self = str.__new__(cls, gh) elif isstr(cll): if ',' in cll: lat, lon = _2fll(*parse3llh(cll)) gh = encode(lat, lon, precision=precision) self = str.__new__(cls, gh) self._latlon = lat, lon else: gh = _2geostr(cll) self = str.__new__(cls, gh) else: # assume LatLon try: lat, lon = _2fll(cll.lat, cll.lon) except AttributeError: raise TypeError('%s: %r' % (Geohash.__name__, cll)) gh = encode(lat, lon, precision=precision) self = str.__new__(cls, gh) self._latlon = lat, lon if name: self.name = name return self @property_RO def ab(self): '''Get the lat- and longitude of (the approximate center of) this geohash as a 2-tuple (lat, lon) in C{radians}. ''' return map2(radians, self.latlon) def adjacent(self, direction): '''Determine the adjacent cell in given compass direction. @arg direction: Compass direction ('N', 'S', 'E' or 'W'). @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 _Neighbor: raise GeohashError('%s invalid: %s' % ('direction', direction)) e = len(self) & 1 # % 2 c = self[-1:] # last hash char i = _Neighbor[d][e].find(c) if i < 0: raise GeohashError('%s invalid: %s' % ('geohash', self)) p = self[:-1] # hash without last char # check for edge-cases which don't share common prefix if p and (c in _Border[d][e]): p = Geohash(p).adjacent(d) # append letter for direction to parent return Geohash(p + _GeohashBase32[i]) 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{{LatLon}}. @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)}. ''' if not self._bounds: self._bounds = bounds(self) return _2bounds(LatLon, LatLon_kwds, *self._bounds) def distance1(self, other): '''DEPRECATED, use method C{distance1To}. ''' return self.distance1To(other) # PYCHOK no cover def distance1To(self, other): '''Estimate the distance between this and an other geohash (from the cell sizes). @arg other: The other geohash (L{Geohash}). @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(_Sizes)) for n in range(n): if self[n] != other[n]: break return float(_Sizes[n][2]) def distance2(self, other, radius=R_M, adjust=False, wrap=False): '''DEPRECATED, use method C{distance2To}. ''' return self.distance2To(other, radius=radius, adjust=adjust, wrap=wrap) # PYCHOK no cover def distance2To(self, other, radius=R_M, adjust=False, wrap=False): '''Compute the distance between this and an other geohash using the U{Equirectangular Approximation / Projection <https://www.Movable-Type.co.UK/scripts/latlong.html>}. @arg other: The other geohash (L{Geohash}). @kwarg radius: Mean earth radius (C{meter}) 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: Approximate distance (C{meter}, same units as I{radius}) or distance squared (C{degrees} squared) if I{radius} is C{None} or 0. @raise TypeError: The I{other} is not a L{Geohash}, C{LatLon} or C{str}. @see: U{Local, flat earth approximation <https://www.EdWilliams.org/avform.htm#flat>}, functions ''' other = _2Geohash(other) a1, b1 = self.latlon a2, b2 = other.latlon if radius: return equirectangular(a1, b1, a2, b2, radius=radius, adjust=adjust, limit=None, wrap=wrap) else: return equirectangular_(a1, b1, a2, b2, adjust=adjust, limit=None, wrap=wrap)[0] def distance3(self, other, radius=R_M, wrap=False): '''DEPRECATED, use method C{distance3To}. ''' return self.distance3To(other, radius=radius, wrap=wrap) # PYCHOK no cover def distance3To(self, other, radius=R_M, wrap=False): '''Compute the great-circle distance between this and an other geohash using the U{Haversine <https://www.Movable-Type.co.UK/scripts/latlong.html>} formula. @arg other: The other geohash (L{Geohash}). @kwarg radius: Mean earth radius (C{meter}). @kwarg wrap: Wrap and unroll longitudes (C{bool}). @return: Great-circle distance (C{meter}, same units as I{radius}). @raise TypeError: The I{other} is not a L{Geohash}, C{LatLon} or C{str}. ''' other = _2Geohash(other) a1, b1 = self.ab a2, b2 = other.ab db, _ = unrollPI(b1, b2, wrap=wrap) return haversine_(a2, a1, db) * float(radius) @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}. B{Example:} >>> geohash.Geohash('geek').latlon # 65.478515625, -17.75390625 >>> geohash.decode('geek') # '65.48', '-17.75' ''' # B{Example:} not @example: since that causes Epydoc error if not self._latlon: s, w, n, e = self.bounds() self._latlon = LatLon2Tuple(favg(n, s), favg(e, w)) return self._latlon @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. B{JSname:} I{neighbours}. ''' r = 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) return self._xnamed(r) @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)} with the latitudinal height and longitudinal width in (C{meter}). ''' n = min(len(_Sizes) - 1, self.precision or 1) return LatLon2Tuple(*map2(float, _Sizes[n][:2])) 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 keyword arguments for B{C{LatLon}}, ignored if B{C{LatLon=None}}. @return: This geohash location (B{C{LatLon}}). @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 ''' r = self.latlon if LatLon: r = LatLon(*r, **LatLon_kwds) return self._xnamed(r) @property_RO def N(self): '''Get the cell North of this (L{Geohash}). ''' if self._N is None: self._N = self.adjacent('N') return self._N @property_RO def S(self): '''Get the cell South of this (L{Geohash}). ''' if self._S is None: self._S = self.adjacent('S') return self._S @property_RO def E(self): '''Get the cell East of this (L{Geohash}). ''' if self._E is None: self._E = self.adjacent('E') return self._E @property_RO def W(self): '''Get the cell West of this (L{Geohash}). ''' if self._W is None: self._W = self.adjacent('W') return self._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 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}}. @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' ''' geohash = _2Geohash(geohash) if len(geohash) < 1: raise GeohashError('%s invalid: %s' % ('geohash', geohash)) s, w, n, e = _Bounds4 d = True for c in geohash: # .lower(): try: i = _DecodedBase32[c] except KeyError: raise GeohashError('%s invalid: %s' % ('geohash', geohash)) 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 return _2bounds(LatLon, LatLon_kwds, s, w, n, e) 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)"} in (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 ''' s, w, n, e = bounds(geohash) # round to near centre without excessive precision # ⌊2-log10(Δ°)⌋ decimal places, strip trailing zeros lat = fstr(favg(n, s), prec=int(2 - log10(n - s))) lon = fstr(favg(e, w), prec=int(2 - log10(e - w))) return lat, lon # strings 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 ''' s, w, n, e = bounds(geohash) return LatLon2Tuple((n - s) * 0.5, (e - w) * 0.5) def distance1(geohash1, geohash2): '''Estimate the distance between two geohash (from the cell sizes). @arg geohash1: First geohash (L{Geohash}). @arg geohash2: Second geohash (L{Geohash}). @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.distance1('u120fxwsh', 'u120fxws0') # 15.239 ''' return _2Geohash(geohash1).distance1(geohash2) def distance2(geohash1, geohash2, radius=R_M): '''Approximate the distance between two geohashes (with Pythagoras' theorem). @arg geohash1: First geohash (L{Geohash}). @arg geohash2: Second geohash (L{Geohash}). @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.distance2('u120fxwsh', 'u120fxws0') # 19.0879 ''' return _2Geohash(geohash1).distance2(geohash2, radius=radius) def distance3(geohash1, geohash2, radius=R_M): '''Compute the great-circle distance between two geohashes (using the Haversine formula). @arg geohash1: First geohash (L{Geohash}). @arg geohash2: Second geohash (L{Geohash}). @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.distance3('u120fxwsh', 'u120fxws0') # 11.6978 ''' return _2Geohash(geohash1).distance3(geohash2, radius=radius) 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: try: p = int(precision) if not 0 < p <= _MaxPrec: raise ValueError except (TypeError, ValueError): raise GeohashError('%s invalid: %r' % ('precision', precision)) else: # 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 s, w, n, e = _Bounds4 b = i = 0 d, gh = True, [] while len(gh) < p: 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(_GeohashBase32[i]) b = i = 0 return ''.join(gh) 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 given (geographic) resolutions. @arg res1: The required, primary (longitudinal) resolution (C{degrees}). @kwarg res2: Optional, required, secondary (latitudinal resolution (C{degrees}). @return: The L{Geohash} precision or length (C{int} 1..12). @see: C++ class U{Geohash <https://GeographicLib.SourceForge.io/html/classGeographicLib_1_1Geohash.html>}. ''' r2 = abs(res1), abs(res1 if res2 is None else res2) for p in range(1, _MaxPrec): if resolution2(p, None if res2 is None else p) <= r2: return p return _MaxPrec def resolution2(prec1, prec2=None): '''Determine the (geographic) resolutions of given L{Geohash} precisions. @arg prec1: The given primary (longitudinal) precision (C{int} 1..12). @kwarg prec2: Optional, secondary (latitudinal) precision (C{int} 1..12). @return: 2-Tuple (C{res1, res2}) with the (geographic) resolutions (C{degrees}) where C{res2} is C{res1} if no I{prec2} is given. @see: C++ class U{Geohash <https://GeographicLib.SourceForge.io/html/classGeographicLib_1_1Geohash.html>}. ''' res1, res2 = 360.0, 180.0 if prec1: p = 5 * max(0, min(int(prec1), _MaxPrec)) res1 = ldexp(res1, -(p - p // 2)) if prec2: p = 5 * max(0, min(int(prec2), _MaxPrec)) res2 = ldexp(res2, -(p // 2)) elif prec2 is None: res2 = res1 return 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 # **) 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. 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