Tracking utility functions

marine_qc.track_check_utils.increment_position(alat1, alon1, avs, ads, timediff)[source]

Compute latitude and longitude increments over half a time interval.

This function takes latitudes and longitude, a speed, a direction and a time difference and returns increments of latitude and longitude which correspond to half the time difference.

Parameters:

  • alat1 (SequenceNumberType) – One-dimensional array of Latitude at starting point in degrees.

  • alon1 (SequenceNumberType) – One-dimensional array of Longitude at starting point in degrees.

  • avs (SequenceNumberType) – One-dimensional array of speed of ship in km/h.

  • ads (SequenceNumberType) – One-dimensional array of heading of ship in degrees.

  • timediff (SequenceNumberType) – One-dimensional array of time difference between the points in hours.

Return type:

tuple[ndarray, ndarray]

Returns:

1D np.ndarray of float – Returns latitude and longitude increment or None and None if timediff is None.