Ellipsoid¶
Ellipsoid is meant to capture common geometry functions that are performed on an ellipsoid.
Factory¶
from isce3.core import ellipsoid
obj = ellipsoid(**kwds)
Documentation¶
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class
isce3.core.Ellipsoid.Ellipsoid¶ Wrapper for pyEllipsoid.
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a¶ Semi-major axis of ellipsoid.
- Returns
Semi-major axis of ellipsoid in meters.
- Return type
float
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b¶ Semi-minor axis of ellipsoid.
- Returns
Semi-minor axis of ellipsoid in meters.
- Return type
float
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static
bind(pyEllipsoid elp)¶ Binds the current pyEllipsoid instance to another C++ Ellipsoid pointer.
- Parameters
elp (
pyEllipsoid) – Source of C++ Ellipsoid pointer.
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copyFrom(elp)¶ Copy ellipsoid parameters with any class that has semi-major axis and eccentricity parameters.
- Parameters
elp (obj) – Any object that has attributes a and e2.
- Returns
None
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e2¶ Eccentricity-squared of ellipsoid.
- Returns
Eccentricity-squared of ellipsoid.
- Return type
float
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getImagingAnglesAtPlatform(pos, vel, los)¶ Compute azimuth angle and look angle at imaging platform.
- Parameters
pos (
numpy.ndarray) – triplet of floats representing platform position in ECEF coordinates (m)vel (
numpy.ndarray) – triplet of floats representing platform veloctity in ECEF coodinates (m/s)los (
numpy.ndarray) – triplet of floats representing line-of-sight vector in ECEF coordiantes (m)
- Returns
- tuple containing:
azi (float): Azimuth angle in radians. Measured anti-clockwise from North.
look (float): Look angle in radians. Measured w.r.t ellipsoid normal at platform.
- Return type
(tuple)
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lonLatToXyz(llh)¶ Transform Lon/Lat/Hgt position to ECEF xyz coordinates.
- Parameters
llh (
numpy.ndarray) – triplet of floats representing Lon (rad), Lat (rad) and hgt (m). Can be of shape (3,) or (n,3).- Returns
triplet of floats representing ECEF coordinates in meters
- Return type
numpy.ndarray
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rDir(lat, hdg)¶ Directional radius as a function of heading and latitude.
Note
lat and hdg should be of same size.
- Parameters
lat (float or
numpy.ndarray) – Latitude in radians. Can be constant or 1D array.hdg (float or
numpy.ndarray) – Heading in radians. Measured clockwise from North.
- Returns
Directional radius in meters.
- Return type
float or
numpy.ndarray
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rEast(lat)¶ Prime Vertical Radius as a function of latitude.
- Parameters
lat (float or
numpy.ndarray) – Latitude in radians. Can be constant or 1D array.- Returns
Prime Vertical radius in meters
- Return type
float or
numpy.ndarray
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rNorth(lat)¶ Meridional radius as a function of latitude.
- Parameters
lat (float or
numpy.ndarray) – Latitude in radians. Can be constant or 1D array.- Returns
Meridional radius in meters
- Return type
float or
numpy.ndarray
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xyzToLonLat(xyz)¶ Transform Lon/Lat/Hgt position to ECEF xyz coordinates.
- Parameters
xyz (
numpy.ndarray) – triplet of floats representing ECEF coordinates in meters. Can be of shape (3,) or (n,3).- Returns
triplet of floats representing Lon (rad), Lat (rad) and hgt (m)
- Return type
numpy.ndarray
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