eatc-airspace - v0.0.1
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    Class ApproachFix

    Represents a fix that is part of an Approach and may include optional operational constraints.

    An ApproachFix extends the basic geographic fix by optionally specifying altitude and speed constraints that must be adhered to when passing this fix during an approach procedure.

    Hierarchy (View Summary)

    Index

    Constructors

    constructor

    Properties

    altitude? latitude longitude speed? FT NMI R

    Methods

    bearingIntersection destination distance initialBearing toCartesian toRadians degToRad from fromCartesian fromDms fromRadians radToDeg

    Constructors

    • Parameters

      • latitude: number

        The latitude of the fix, expressed in decimal degrees.

      • longitude: number

        The longitude of the fix, expressed in decimal degrees.

      • Optionalaltitude: number

        Optional altitude constraint, in feet. The constraint indicates the aircraft must be at or below this altitude when passing the fix.

      • Optionalspeed: number

        Optional speed constraint, in KIAS (knots indicated airspeed). The constraint indicates the aircraft must be at or below this speed when passing the fix.

      Returns ApproachFix

    Properties

    altitude?: number

    Optional altitude constraint, in feet. The constraint indicates the aircraft must be at or below this altitude when passing the fix.

    latitude: number

    The latitude, in degrees, of this fix.

    longitude: number

    The longitude, in degrees, of this fix.

    speed?: number

    Optional speed constraint, in KIAS (knots indicated airspeed). The constraint indicates the aircraft must be at or below this speed when passing the fix.

    FT: 0.3048

    Feet in a metre.

    NMI: 1852

    Metres in a nautical mile.

    R: 6371000 = 6371e3

    Mean radius of Earth, in metres.

    Methods

    • Find the intersection point given two start points and bearings from those points.

      Parameters

      • bearing: number

        The bearing from this fix, in degrees from true north.

      • other: Fix

        The other fix.

      • otherBearing: number

        The bearing from the other fix, in degrees from true north.

      Returns Fix

      A new Fix at the intersection point.

    • Find the destination point from the current position given a bearing and distance.

      Uses the haversine formula to compute the new latitude and longitude after travelling a specified distance along a given bearing on the Earth’s surface.

      Parameters

      • bearing: number

        The bearing from this fix, in degrees from true north.

      • distance: number

        The distance, in nautical miles.

      Returns Fix

      A new Fix at the destination point.

    • Find the great circle distance between two fixes.

      Parameters

      • other: Fix

        The other fix.

      Returns number

      The distance between the two fixes, in metres.

    • Find the initial bearing (forward azimuth) from this fix to another.

      Parameters

      • other: Fix

        The other fix.

      Returns number

      The initial bearing (forward azimuth), in degrees from true north.

    • Get the three-dimensional cartesian coordinates of this fix.

      Returns [x: number, y: number, z: number]

    • Create approach fix from a fix.

      Parameters

      • fix: Fix

        A fix.

      • Optionalaltitude: number

        Optional altitude constraint, in feet.

      • Optionalspeed: number

        Optional speed constraint, in KIAS (knots indicated airspeed).

      Returns ApproachFix

      A new ApproachFix with the specified constraints.

    • Create a fix from 3-dimensional cartesian coordinates.

      Parameters

      • coordinates: readonly [number, number, number]

        3D cartesian coordinates.

      Returns Fix

    • Create fix from DMS coordinates string.

      This method accepts a wide range of formats and notations for DMS (degrees, minutes, seconds) coordinates. However, the following criteria must always be satisfied:

      • Degrees, minutes, and seconds must all be present (even if 0), and in that order.
      • Degrees ∈ [0, 180).
      • Minutes ∈ [0, 60).
      • Seconds ∈ [0, 60).
      • A cardinal direction must be indicated by the first occurrence of either a case-insensitive character N, E, S, or W, or a ‘+’, dash (‘-’), or minus (‘−’) sign, present anywhere in the coordinate string.

      Parameters

      • latitude: string

        Latitude in DMS.

      • longitude: string

        Longitude in DMS.

      Returns Fix

      fromDMS("512930N", "0011311W")

      fromDMS("512839.63N", "0002559.82W")

      fromDMS("51° 34' 45.0732\" N", "0° 36' 29.8230\" E")

    • Create a new fix from latitude and longitude in radians.

      Parameters

      • φ: number

        Latitude, in radians.

      • λ: number

        Longitude, in radians.

      Returns Fix

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