nvector package

Geodesic functions

lat_lon2n_E(latitude, longitude[, R_Ee])	Converts latitude and longitude to n-vector.
n_E2lat_lon(n_E[, R_Ee])	Converts n-vector to latitude and longitude.
n_EB_E2p_EB_E(n_EB_E[, depth, a, f, R_Ee])	Converts n-vector to Cartesian position vector in meters.
p_EB_E2n_EB_E(p_EB_E[, a, f, R_Ee])	Converts Cartesian position vector in meters to n-vector.
n_EA_E_and_n_EB_E2p_AB_E(n_EA_E, n_EB_E[, ...])	Return the delta vector from position A to B.
n_EA_E_and_p_AB_E2n_EB_E(n_EA_E, p_AB_E[, ...])	Return position B from position A and delta.
n_EA_E_and_n_EB_E2azimuth(n_EA_E, n_EB_E[, ...])	Return azimuth from A to B, relative to North:
n_EA_E_distance_and_azimuth2n_EB_E(n_EA_E, ...)	Return position B from azimuth and distance from position A
great_circle_distance(n_EA_E, n_EB_E[, radius])	Return great circle distance between positions A and B
euclidean_distance(n_EA_E, n_EB_E[, radius])	Return Euclidean distance between positions A and B
cross_track_distance(path, n_EB_E[, method, ...])	Return cross track distance between path A and position B.
closest_point_on_great_circle(path, n_EB_E)	Return closest point C on great circle path A to position B.
intersect(path_a, path_b)	Return the intersection(s) between the great circles of the two paths
mean_horizontal_position(n_EB_E)	Return the n-vector of the horizontal mean position.
on_great_circle(path, n_EB_E[, radius, ...])	True if position B is on great circle through path A.
on_great_circle_path(path, n_EB_E[, radius, ...])	True if position B is on great circle and between endpoints of path A.

Rotation matrices and angles

E_rotation([axes])	Return rotation matrix R_Ee defining the axes of the coordinate frame E.
n_E2R_EN(n_E[, R_Ee])	Returns the rotation matrix R_EN from n-vector.
n_E_and_wa2R_EL(n_E, wander_azimuth[, R_Ee])	Returns rotation matrix R_EL from n-vector and wander azimuth angle.
R_EL2n_E(R_EL)	Returns n-vector from the rotation matrix R_EL.
R_EN2n_E(R_EN)	Returns n-vector from the rotation matrix R_EN.
R2xyz(R_AB)	Returns the angles about new axes in the xyz-order from a rotation matrix.
R2zyx(R_AB)	Returns the angles about new axes in the zxy-order from a rotation matrix.
xyz2R(x, y, z)	Returns rotation matrix from 3 angles about new axes in the xyz-order.
zyx2R(z, y, x)	Returns rotation matrix from 3 angles about new axes in the zyx-order.

Misc functions

nthroot(x, n)	Return the n’th root of x to machine precision
deg(rad_angle)	Converts angle in radians to degrees.
rad(deg_angle)	Converts angle in degrees to radians.
select_ellipsoid(name)	Return semi-major axis (a), flattening (f) and name of ellipsoid
unit(vector[, norm_zero_vector])	Convert input vector to a vector of unit length.

OO interface to Geodesic functions

FrameE([a, f, name, axes])	Earth-fixed frame
FrameN(position)	North-East-Down frame
FrameL(position[, wander_azimuth])	Local level, Wander azimuth frame
FrameB(position[, yaw, pitch, roll, degrees])	Body frame
ECEFvector(pvector[, frame])	Geographical position given as Cartesian position vector in frame E
GeoPoint(latitude, longitude[, z, frame, ...])	Geographical position given as latitude, longitude, depth in frame E
Nvector(normal[, z, frame])	Geographical position given as n-vector and depth in frame E
GeoPath(positionA, positionB)	Geographical path between two positions in Frame E
Pvector(pvector, frame)
diff_positions(positionA, positionB)	Return delta vector from positions A to B.