pyrocko.orthodrome_ext

C-extension supporting pyrocko.orthodrome.

Functions

azibazi	Calculate azimuth and backazimuth directions of great circle path at a pair of points on spherical earth.
azibazi_numpy	Calculate azimuth and backazimuth directions of great circle path at pairs of points on spherical earth (array version).
distance_accurate50m	Calculate great circle distance between pair of points on ellipsoidal earth.
distance_accurate50m_numpy	Calculate great circle distance between pairs of points on ellipsoidal earth (array version).
geodesic_direct_numpy	Solve direct geodesic problem on the WGS84 ellipsoid (array version).
geodesic_inverse_numpy	Solve inverse geodesic problem on the WGS84 ellipsoid (array version).

azibazi()

Calculate azimuth and backazimuth directions of great circle path at a pair of points on spherical earth.

Parameters:

• alat (float) – Latitude of point 1.

• alon (float) – Longitude of point 1.

• blat (float) – Latitude of point 2.

• blon (float) – Longitude of point 2.

azibazi_numpy()

Calculate azimuth and backazimuth directions of great circle path at pairs of points on spherical earth (array version).

Parameters:

• alat (numpy.ndarray) – Latitudes of points 1

• alon (numpy.ndarray) – Longitudes of points 1

• blat (numpy.ndarray) – Latitudes of points 2

• blon (numpy.ndarray) – Longitudes of points 2

distance_accurate50m()

Calculate great circle distance between pair of points on ellipsoidal earth.

Parameters:

• alat (float) – Latitude of point 1

• alon (float) – Longitude of point 1

• blat (float) – Latitude of point 2

• blon (float) – Longitude of point 2

distance_accurate50m_numpy()

Calculate great circle distance between pairs of points on ellipsoidal earth (array version).

Parameters:

• alat (numpy.ndarray) – Latitudes of points 1

• alon (numpy.ndarray) – Longitudes of points 1

• blat (numpy.ndarray) – Latitudes of points 2

• blon (numpy.ndarray) – Longitudes of points 2

geodesic_direct_numpy()

Solve direct geodesic problem on the WGS84 ellipsoid (array version).

Uses the algorithms of Karney (2013) from GeographicLib.

Parameters:

• lats1 (numpy.ndarray) – Latitudes of start points [deg].

• lons1 (numpy.ndarray) – Longitudes of start points [deg].

• azis1 (numpy.ndarray) – Azimuths at start points [deg].

• dists (numpy.ndarray) – Distances along the geodesics [m].

Returns:

(lats2, lons2, azis2), latitudes, longitudes and forward azimuths at end points [deg].

geodesic_inverse_numpy()

Solve inverse geodesic problem on the WGS84 ellipsoid (array version).

Uses the algorithms of Karney (2013) from GeographicLib.

Parameters:

• lats1 (numpy.ndarray) – Latitudes of points 1 [deg].

• lons1 (numpy.ndarray) – Longitudes of points 1 [deg].

• lats2 (numpy.ndarray) – Latitudes of points 2 [deg].

• lons2 (numpy.ndarray) – Longitudes of points 2 [deg].

Returns:

(dists, azis1, azis2), distances [m], azimuths at points 1 and forward azimuths at points 2 [deg].