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object --+ | named._Named --+ | named._NamedBase --+ | _AzimuthalBase
(INTERNAL) Base class for azimuthal projections.
Azimuthal projections are centered at an arbitrary position on the
sphere or ellipsoid. For a point in projected space (x, y)
,
the geodesic distance from the center position is hypot(x,
y)
and the azimuth
off tru North of the geodesic from
the center point is atan2(x, y)
(note (x, y)
,
not (y, x)
!).
The .forward
and .reverse
methods both
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.
Instance Methods | |||
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Inherited from Inherited from Inherited from |
Properties | |
datum Get the datum (Datum). |
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equatoradius Get the geodesic's equatorial (major) radius, semi-axis ( meter ).
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majoradius Get the geodesic's equatorial (major) radius, semi-axis ( meter ).
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flattening Get the geodesic's flattening ( float ).
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lat0 Get the center latitude ( degrees90 ).
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latlon0 Get the center lat- and longitude (LatLon2Tuple (lat, lon) ) in
(degrees90 , (degrees180 ).
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lon0 Get the center longitude ( degrees180 ).
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radius Get this projection's mean radius of curvature ( meter ).
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Inherited from Inherited from |
Method Details |
New azimuthal projection.
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Set or reset the center point of this azimuthal projection.
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Return a string representation of this projection.
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Return a string representation of this projection.
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Property Details |
datumGet the datum (Datum).
|
equatoradiusGet the geodesic's equatorial (major) radius, semi-axis
(
|
majoradiusGet the geodesic's equatorial (major) radius, semi-axis
(
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flatteningGet the geodesic's flattening (
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lat0Get the center latitude (
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latlon0Get the center lat- and longitude (LatLon2Tuple
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lon0Get the center longitude (
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radiusGet this projection's mean radius of curvature
(
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