def equirectangularTo(self, other, radius=None, **options):
'''Compute the distance between this and an other point
using the U{Equirectangular Approximation / Projection
<http://www.Movable-Type.co.UK/scripts/latlong.html>}.
Suitable only for short, non-near-polar distances up to a
few hundred Km or Miles. Use method C{haversineTo} or
C{distanceTo*} for more accurate and/or larger distances.
See function L{equirectangular_} for more details, the
available I{options} and errors raised.
@param other: The other point (C{LatLon}).
@keyword radius: Optional, mean earth radius (C{meter}) or
C{None} for the mean radius of this
point's datum ellipsoid.
@keyword options: Optional keyword arguments for function
L{equirectangular}.
@return: Distance (C{meter}, same units as I{radius}).
@raise TypeError: The I{other} point is not C{LatLon}.
'''
self.others(other)
r = radius or (self._datum.ellipsoid.R1 if self._datum else R_M)
return equirectangular(self.lat, self.lon, other.lat, other.lon,
radius=r, **options)
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
<http://www.Movable-Type.co.UK/scripts/latlong.html>}.
@param other: The other geohash (L{Geohash}).
@keyword radius: Optional, mean earth radius (C{meter}) or
C{None}.
@keyword adjust: Adjust the wrapped, unrolled longitudinal
delta by the cosine of the mean latitude
(C{bool}).
@keyword 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
<http://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]