# Lat/lon manipulators

Ngl.add_cyclic | Adds cyclic points to an array. |

Ngl.gaus | Computes gaussian latitudes and weights. |

Ngl.gc_convert | Converts degrees along a great circle to radians, meters, feet, or kilometers. |

Ngl.gc_dist | Calculates the distance in degrees along a great circle between two points. |

Ngl.gc_inout | Determines if a specified point is inside or outside of a spherical polygon. |

Ngl.gc_interp | Interpolates points along a great circle between two specified points on the globe. |

Ngl.gc_qarea | Finds the area of a convex quadrilateral patch on a sphere whose vertices are given in degrees as lat/lon pairs. |

Ngl.gc_tarea | Finds the area of a triangular patch on a sphere whose vertices are given in degrees as lat/lon pairs. |

Ngl.normalize_angle | Normalizes any angle in degrees to be in the interval [0.,360.) or [-180.,180.). |