Module geodesic 

Geodesic tools

Structs

GeodGeodesic

The struct containing information about the ellipsoid. This must be initialized by geod_init() before use.

GeodGeodesicline

The struct containing information about a single geodesic. This must be initialized by geod_lineinit(), geod_directline(), geod_gendirectline(), or geod_inverseline() before use.

Enums

CapType

Cap Types to build for the \e caps argument to geod_lineinit().

GeodFlags

flag values for the \e flags argument to geod_gendirect() and geod_genposition()

GeodMask

mask values for the \e caps argument to geod_lineinit().

Functions

a1m1f

The scale factor A1-1 = mean value of (d/dsigma)I1 - 1

ang_diff

Compute the difference between two angles in degrees

ang_normalize

Normalize an angle in degrees to the range [-180, 180]

ang_round

Round an angle in degrees to the nearest integer

astroid

Solve k^4+2k^3-(x^2+y^2-1)k^2-2y^2k-y^2 = 0 for positive root k This solution is adapted from Geocentric::Reverse

atan2dx

In order to minimize round-off errors, this function rearranges the arguments so that result of atan2 is in the range [-pi/4, pi/4] before converting it to degrees and mapping the result to the correct quadrant.

geod_direct

Compute the geodesic directly between two points

geod_gendirect

Compute the geodesic directly between two points

geod_geninverse

Compute the geodesic inverse between two points

geod_geninverse_int

Compute the geodesic inverse between two points

geod_genposition

Compute the geodesic position between two points

geod_init

Initialize a GeodGeodesic object

geod_inverse

Compute the geodesic inverse between two points

geod_lineinit

Initialize a geodesic line

geod_lineinit_int

Initialize a geodesic line

inverse_start

Inverse geodesic

lambda12

Compute lambda12

lat_fix

Limit x to the range [-qd, qd]

norm2

Normalize sin(x) and cos(x)

polyvalx

Evaluation sum(p[i] * x^i, i, 0, N) via Horner’s method.

sin_cos_series

Evaluate

sincosdx

In order to minimize round-off errors, this function exactly reduces the argument to the range [-45, 45] before converting it to radians.

swapx

Swap x and y