# Coverage for pygeodesy/wgrs.py : 94%

## 208 statements 195 run 13 missing 11 excluded

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Transcribed from C++ class U{Georef <https://GeographicLib.SourceForge.io/html/classGeographicLib_1_1Georef.html>} by I{Charles Karney}, but with modified C{precision} and extended with C{height} and C{radius}. See also U{World Geographic Reference System <https://WikiPedia.org/wiki/World_Geographic_Reference_System>}. ''' from pygeodesy.basics import EPS1_2, _isnotError, isstr, \ _MISSING, property_RO from pygeodesy.dms import parse3llh, parseDMS2 from pygeodesy.lazily import _ALL_LAZY from pygeodesy.named import LatLon2Tuple, LatLonPrec3Tuple, \ LatLonPrec5Tuple, _NamedStr from pygeodesy.utily import ft2m, m2ft, m2NM # all public contants, classes and functions __all__ = _ALL_LAZY.wgrs + ('decode3', 'decode5', # functions 'encode', 'precision', 'resolution') __version__ = '20.03.23' _Base = 10 _BaseLen = 4 _Degrees = 'ABCDEFGHJKLMNPQ' _Digits = '0123456789' _LatOrig = -90 _LatTile = 'ABCDEFGHJKLM' _LonOrig = -180 _LonTile = 'ABCDEFGHJKLMNPQRSTUVWXYZ' _M = 60000000000 # = 60_000_000_000 = 60 * pow(10, 9) _MaxPrec = 11 _Tile = 15 # tile size in degrees _MaxLen = _BaseLen + 2 * _MaxPrec _MinLen = _BaseLen - 2 _LatOrig_M = _LatOrig * _M _LonOrig_M = _LonOrig * _M _LatOrig_Tile = float(_LatOrig) / _Tile _LonOrig_Tile = float(_LonOrig) / _Tile def _2divmod3(x, Orig_M): x *= _M i = int(x) if i > x: # floor(x * _M) i -= 1 i, x = divmod(i - Orig_M, _M) xt, xd = divmod(i, _Tile) return xt, xd, x def _2fllh(lat, lon, height=None): '''(INTERNAL) Convert lat, lon, height. ''' return parseDMS2(lat, lon) + (height,) def _2geostr2(georef): '''(INTERNAL) Check a georef string. ''' try: n, geostr = len(georef), georef.upper() p, o = divmod(n, 2) if o or n < _MinLen or n > _MaxLen \ or geostr[:3] == 'INV' \ or not geostr.isalnum(): raise ValueError except (AttributeError, TypeError, ValueError): raise WGRSError('%s: %r[%s]' % (Georef.__name__, georef, len(georef))) return geostr, p - 1 class WGRSError(ValueError): '''World Geographic Reference System (WGRS) encode, decode or other L{Georef} issue. ''' pass class Georef(_NamedStr): '''Georef class, a C{_NamedStr}. ''' _height = _MISSING # meter _latlon = None # cached latlon property _precision = None _radius = _MISSING # meter # no str.__init__ in Python 3 def __new__(cls, cll, precision=3, name=''): '''New L{Georef} from an other L{Georef} instance or georef C{str} or from a C{LatLon} instance or lat-/longitude C{str}. @arg cll: Cell or location (L{Georef} or C{str}, C{LatLon} or C{str}). @kwarg precision: Optional, the desired georef resolution and length (C{int} 0..11), see function L{wgrs.encode} for more details. @kwarg name: Optional name (C{str}). @return: New L{Georef}. @raise RangeError: Invalid B{C{cll}} lat- or longitude. @raise TypeError: Invalid B{C{cll}}. @raise WGRSError: INValid or non-alphanumeric B{C{cll}}. ''' if isinstance(cll, Georef): g, p = _2geostr2(str(cll)) self = str.__new__(cls, g) self._latlon = LatLon2Tuple(*cll._latlon) self._name = cll._name self._precision = p # cll._precision elif isstr(cll): if ',' in cll: lat, lon, h = _2fllh(*parse3llh(cll, height=None)) g = encode(lat, lon, precision=precision, height=h) # PYCHOK false self = str.__new__(cls, g) self._latlon = LatLon2Tuple(lat, lon) self._precision = precision if h not in (None, _MISSING): self._height = h else: self = str.__new__(cls, cll.upper()) self._decode() else: # assume LatLon try: lat, lon, h = _2fllh(cll.lat, cll.lon) h = getattr(cll, 'height', h) except AttributeError: raise _isnotError('valid', **{Georef.__name__: cll}) g = encode(lat, lon, precision=precision, height=h) # PYCHOK false self = str.__new__(cls, g) self._latlon = LatLon2Tuple(lat, lon) self._precision = precision if h not in (None, _MISSING): self._height = h if name: self.name = name return self def _decode(self): # cache all decoded attrs lat, lon, p, h, r = decode5(self) # PYCHOK LatLonPrec5Tuple if self._latlon is None: self._latlon = LatLon2Tuple(lat, lon) if self._precision is None: self._precision = p if self._height is _MISSING: self._height = h if self._radius is _MISSING: self._radius = r @property_RO def height(self): '''Get this georef's height in C{meter} or C{None} if missing. ''' if self._height is _MISSING: self._decode() return self._height @property_RO def latlon(self): '''Get this georef's (center) lat- and longitude (L{LatLon2Tuple}). ''' if self._latlon is None: self._decode() return self._latlon @property_RO def precision(self): '''Get this georef's precision (C{int}). ''' if self._precision is None: self._decode() return self._precision @property_RO def radius(self): '''Get this georef's radius in C{meter} or C{None} if missing. ''' if self._radius is _MISSING: self._decode() return self._radius def toLatLon(self, LatLon=None, height=None, **LatLon_kwds): '''Return (the center of) this georef cell as an instance of the supplied C{LatLon} class. @kwarg LatLon: Class to use (C{LatLon}) or C{None}. @kwarg height: Optional height ({meter}). @kwarg LatLon_kwds: Optional, additional B{C{LatLon}} keyword arguments, ignored if B{C{LatLon=None}}. @return: This georef location (B{C{LatLon}}) or if B{C{LatLon}} is C{None}, a L{LatLon3Tuple}C{(lat, lon, height)}. @raise TypeError: Invalid B{C{LatLon}} or B{C{LatLon_kwds}}. ''' h = (self.height or 0) if height is None else height r = self.latlon.to3Tuple(h) if LatLon is None else \ LatLon(*self.latlon, height=h, **LatLon_kwds) return self._xnamed(r) def decode3(georef, center=True): '''Decode a C{georef} to lat-, longitude and precision. @arg georef: To be decoded (L{Georef} or C{str}). @kwarg center: If C{True} the center, otherwise the south-west, lower-left corner (C{bool}). @return: A L{LatLonPrec3Tuple}C{(lat, lon, precision)}. @raise WGRSError: Invalid B{C{georef}}, INValid, non-alphanumeric or odd length B{C{georef}}. ''' def _digit(ll, g, i, m): d = _Digits.find(g[i]) if d < 0 or d >= m: raise _Error(i) return ll * m + d def _Error(i): return WGRSError('%s invalid: %r[%s]' % ('georef', georef, i)) def _index(chars, g, i): k = chars.find(g[i]) if k < 0: raise _Error(i) return k g, precision = _2geostr2(georef) lon = _index(_LonTile, g, 0) + _LonOrig_Tile lat = _index(_LatTile, g, 1) + _LatOrig_Tile u, p = 1.0, precision - 1 if p >= 0: lon = lon * _Tile + _index(_Degrees, g, 2) lat = lat * _Tile + _index(_Degrees, g, 3) if p > 0: m = 6 for i in range(p): lon = _digit(lon, g, _BaseLen + i, m) lat = _digit(lat, g, _BaseLen + i + p, m) u *= m m = _Base u *= _Tile if center: lon = lon * 2 + 1 lat = lat * 2 + 1 u *= 2 u = _Tile / u lon *= u lat *= u return LatLonPrec3Tuple(lat, lon, precision) def decode5(georef, center=True): '''Decode a C{georef} to lat-, longitude, precision, height and radius. @arg georef: To be decoded (L{Georef} or C{str}). @kwarg center: If C{True} the center, otherwise the south-west, lower-left corner (C{bool}). @return: A L{LatLonPrec5Tuple}C{(lat, lon, precision, height, radius)} where C{height} and/or C{radius} are C{None} if missing. @raise WGRSError: Invalid B{C{georef}}, INValid, non-alphanumeric or odd length B{C{georef}}. ''' def _h2m(kft): return ft2m(kft * 1000.0) def _r2m(NM): return NM / m2NM(1) def _split2(g, name, _2m): i = max(g.rfind(name[0]), g.rfind(name[0])) if i > _BaseLen: try: return g[:i], _2m(int(g[i+1:])) except (IndexError, ValueError): raise WGRSError('%s invalid: %r' % (name, georef)) return g, None try: g = str(georef) except (TypeError, ValueError): raise WGRSError('%s invalid: %r' % ('georef', georef)) g, h = _split2(g, 'Height', _h2m) # H is last g, r = _split2(g, 'Radius', _r2m) # R before H a, b, p = decode3(g, center=center) return LatLonPrec5Tuple(a, b, p, h, r) def encode(lat, lon, precision=3, height=None, radius=None): # MCCABE 14 '''Encode a lat-/longitude as a C{georef} of the given precision. @arg lat: Latitude (C{degrees}). @arg lon: Longitude (C{degrees}). @kwarg precision: Optional, the desired C{georef} resolution and length (C{int} 0..11). @kwarg height: Optional, height in C{meter}, see U{Designation of area <https://WikiPedia.org/wiki/World_Geographic_Reference_System>}. @kwarg radius: Optional, radius in C{meter}, see U{Designation of area <https://WikiPedia.org/wiki/World_Geographic_Reference_System>}. @return: The C{georef} (C{str}). @raise RangeError: Invalid B{C{lat}} or B{C{lon}}. @raise WGRSError: Invalid B{C{precision}}, B{C{height}} or B{C{radius}}. @note: The B{C{precision}} value differs from U{Georef<https:// GeographicLib.SourceForge.io/html/classGeographicLib_1_1Georef.html>}. The C{georef} length is M{2 * (precision + 1)} and the C{georef} resolution is I{15°} for B{C{precision}} 0, I{1°} for 1, I{1′} for 2, I{0.1′} for 3, I{0.01′} for 4, ... M{10**(2 - precision)}. ''' def _option(name, m, m2_, K): try: f = m2_(float(m) * K) if f < 0: raise ValueError except (TypeError, ValueError): raise WGRSError('%s invalid: %r' % (name, m)) return '%s%d' % (name[0], int(f + 0.5)) def _pstr(p, x): return '%0*d' % (p, x) try: p = int(precision) if p < 0 or p > _MaxPrec: raise ValueError except (TypeError, ValueError): raise WGRSError('%s invalid: %r' % ('precision', precision)) lat, lon, _ = _2fllh(lat, lon) if lat == 90: lat *= EPS1_2 xt, xd, x = _2divmod3(lon, _LonOrig_M) yt, yd, y = _2divmod3(lat, _LatOrig_M) g = _LonTile[xt], _LatTile[yt] if p > 0: g += _Degrees[xd], _Degrees[yd] p -= 1 if p > 0: d = pow(_Base, _MaxPrec - p) x = _pstr(p, x // d) y = _pstr(p, y // d) g += x, y if radius is not None: # R before H g += _option('Radius', radius, m2NM, 1.0), if height is not None: # H is last g += _option('Height', height, m2ft, 1e-3), return ''.join(g) def precision(res): '''Determine the L{Georef} precision to meet a required (geographic) resolution. @arg res: The required resolution (C{degrees}). @return: The L{Georef} precision (C{int} 0..11). @see: Function L{wgrs.encode} for more C{precision} details. ''' r = abs(res) for p in range(_MaxPrec): if resolution(p) <= r: return p return _MaxPrec def resolution(prec): '''Determine the (geographic) resolution of a given L{Georef} precision. @arg prec: The given precision (C{int}). @return: The (geographic) resolution (C{degrees}). @see: Function L{wgrs.encode} for more C{precision} details. ''' if prec < 1: r = float(_Tile) elif prec == 1: r = 1.0 else: r = 1.0 / (60.0 * pow(_Base, min(prec, _MaxPrec) - 1)) return r # **) MIT License # # Copyright (C) 2016-2020 -- mrJean1 at Gmail -- All Rights Reserved. # # Permission is hereby granted, free of charge, to any person obtaining a # copy of this software and associated documentation files (the "Software"), # to deal in the Software without restriction, including without limitation # the rights to use, copy, modify, merge, publish, distribute, sublicense, # and/or sell copies of the Software, and to permit persons to whom the # Software is furnished to do so, subject to the following conditions: # # The above copyright notice and this permission notice shall be included # in all copies or substantial portions of the Software. # # THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS # OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, # FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL # THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR # OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, # ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR # OTHER DEALINGS IN THE SOFTWARE.