Module ellipsoidalKarney
Ellipsoidal geodetic (lat-/longitude) and cartesian (x/y/z) classes LatLon and Cartesian and functions areaOf and perimeterOf based on the Python implementation of
Charles F. F. Karney's GeographicLib.
Here's an example usage of ellipsoidalKarney
:
>>> from pygeodesy.ellipsoidalKarney import LatLon
>>> Newport_RI = LatLon(41.49008, -71.312796)
>>> Cleveland_OH = LatLon(41.499498, -81.695391)
>>> Newport_RI.distanceTo(Cleveland_OH)
866,455.4329098687 # meter
You can change the ellipsoid model used by the Karney formulae as
follows:
>>> from pygeodesy import Datums
>>> from pygeodesy.ellipsoidalKarney import LatLon
>>> p = LatLon(0, 0, datum=Datums.OSGB36)
or by converting to anothor datum:
>>> p = p.convertDatum(Datums.OSGB36)
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LatLon
An ellipsoidal LatLon similar to ellipsoidalVincenty.LatLon but using Charles F.
F. Karney's Python GeographicLib to compute the geodesic distance,
initial and final bearing (azimuths) between two given points or
the destination point given a start point and an initial bearing.
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Cartesian
Extended to convert (geocentric) Cartesian points to Karney-based (ellipsoidal)
geodetic LatLon.
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areaOf(points,
datum=Datum(name='WGS84', ellipsoid=Ellipsoids.WGS84, transform=Tran... ,
wrap=True)
Compute the area of a polygon defined by an array, list, sequence,
set or tuple of points on the given datum. |
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perimeterOf(points,
closed=False,
datum=Datum(name='WGS84', ellipsoid=Ellipsoids.WGS84, transform=Tran... ,
wrap=True)
Compute the perimeter of a polygon/-line defined by an array, list,
sequence, set or tuple of points on the given datum. |
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areaOf(points,
datum=Datum(name='WGS84', ellipsoid=Ellipsoids.WGS84, transform=Tran... ,
wrap=True)
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Compute the area of a polygon defined by an array, list, sequence, set
or tuple of points on the given datum.
- Parameters:
points - The points defining the polygon (LatLon[]).
datum - Optional datum (Datum).
wrap - Wrap and unroll longitudes (bool).
- Returns:
- Area (meter squared).
- Raises:
ImportError - Package GeographicLib missing.
TypeError - Some points are not LatLon.
ValueError - Insufficient number of points or longitudes not wrapped,
unrolled.
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perimeterOf(points,
closed=False,
datum=Datum(name='WGS84', ellipsoid=Ellipsoids.WGS84, transform=Tran... ,
wrap=True)
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Compute the perimeter of a polygon/-line defined by an array, list,
sequence, set or tuple of points on the given datum.
- Parameters:
points - The points defining the polygon (LatLon[]).
closed - Optionally, close the polygon/-line (bool).
datum - Optional datum (Datum).
wrap - Wrap and unroll longitudes (bool).
- Returns:
- Perimeter (meter).
- Raises:
ImportError - Package GeographicLib missing.
TypeError - Some points are not LatLon.
ValueError - Insufficient number of points or longitudes not wrapped,
unrolled.
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