Class EquidistantKarney
object --+
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named._Named --+
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named._NamedBase --+
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_AzimuthalBase --+
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EquidistantKarney
Azimuthal equidistant projection, a Python version of Karney's C++
class AzimuthalEquidistant, requiring package geographiclib to be installed.
An azimuthal equidistant projection is centered at an arbitrary
position on the ellipsoid. For a point in projected space (x,
y)
, the geodesic distance from the center position is
hypot(x, y)
and the azimuth
of the geodesic
from the center point is atan2(x, y)
, note (x,
y)
, not (y, x)
!.
The .forward
and .reverse
methods also
return the azimuth
of the geodesic at (x, y)
and the scale
in the azimuthal direction which, together
with the basic properties of the projection, serve to specify completely
the local affine transformation between geographic and projected
coordinates.
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__init__(self,
lat0,
lon0,
datum=Datum(name='WGS84', ellipsoid=Ellipsoids.WGS84, transform=Tran... ,
name='
' )
New azimuthal EquidistantKarney projection. |
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forward(self,
lat,
lon,
name='
' )
Convert an (ellipsoidal) geodetic location to azimuthal equidistant
east- and northing. |
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reverse(self,
x,
y,
name='
' ,
LatLon=None,
**LatLon_kwds)
Convert an azimuthal equidistant location to (ellipsoidal) geodetic
lat- and longitude. |
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Inherited from _AzimuthalBase :
reset ,
toRepr ,
toStr
Inherited from named._NamedBase :
__repr__ ,
__str__ ,
others
Inherited from named._Named :
_dot_ ,
attrs ,
classof ,
copy ,
toStr2
Inherited from object :
__delattr__ ,
__format__ ,
__getattribute__ ,
__hash__ ,
__new__ ,
__reduce__ ,
__reduce_ex__ ,
__setattr__ ,
__sizeof__ ,
__subclasshook__
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geodesic
Get this projection's wrapped Karney Geodesic, provided package geographiclib is installed.
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Inherited from _AzimuthalBase :
datum ,
equatoradius ,
flattening ,
lat0 ,
latlon0 ,
lon0 ,
majoradius ,
radius
Inherited from named._Named :
classname ,
classnaming ,
name ,
named ,
named2
Inherited from object :
__class__
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__init__ (self,
lat0,
lon0,
datum=Datum(name='WGS84', ellipsoid=Ellipsoids.WGS84, transform=Tran... ,
name='
' )
(Constructor)
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New azimuthal EquidistantKarney projection.
- Arguments:
lat0 - Latitude of center point (degrees90 ).
lon0 - Longitude of center point (degrees180 ).
datum - Optional (ellipsoidal) datum (Datum ).
name - Optional name for the projection (str ).
- Raises:
- Overrides:
object.__init__
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forward (self,
lat,
lon,
name='
' )
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Convert an (ellipsoidal) geodetic location to azimuthal equidistant
east- and northing.
- Arguments:
lat - Latitude of the location (degrees90 ).
lon - Longitude of the location (degrees180 ).
name - Optional name for the location (str ).
- Returns:
- An Azimuthal7Tuple
(x, y, lat, lon, azimuth,
scale, datum) with x and y in
meter and lat and lon in
degrees . The scale of the projection
is 1 in radial direction,
azimuth clockwise from true North and is 1 /
reciprocal in the direction perpendicular to this.
See Also:
Method EquidistantKarney.reverse. A call to
.forward followed by a call to .reverse
will return the original lat, lon to within roundoff.
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reverse (self,
x,
y,
name='
' ,
LatLon=None,
**LatLon_kwds)
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Convert an azimuthal equidistant location to (ellipsoidal) geodetic
lat- and longitude.
- Arguments:
x - Easting of the location (meter ).
y - Northing of the location (meter ).
name - Optional name for the location (str ).
LatLon - Class to use (LatLon ) or None .
LatLon_kwds - Optional, additional LatLon keyword
arguments, ignored if LatLon=None .
- Returns:
- The geodetic (
LatLon ) of if
LatLon is None an Azimuthal7Tuple(x, y, lat, lon, azimuth,
scale, datum) .
Note:
The lat will be in the range [-90..90]
degrees and lon in the range [-180..180]
degrees . The scale of the projection is 1 in
radial direction, azimuth clockwise from true
North and is 1 / reciprocal in the direction
perpendicular to this.
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geodesic
Get this projection's wrapped Karney Geodesic, provided package geographiclib is installed.
- Get method:
- geodesic(self)
- Get this projection's wrapped Karney Geodesic, provided package geographiclib is installed.
- Set method:
- immutable(inst,
value)
- Throws an
AttributeError , always.
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