openpiv.validation.global_val

openpiv.validation.global_val(u: numpy.ndarray, v: numpy.ndarray, u_thresholds: Tuple[int, int], v_thresholds: Tuple[int, int]) → numpy.ndarray[source]

Eliminate spurious vectors with a global threshold.

This validation method tests for the spatial consistency of the data and outliers vector are replaced with Nan (Not a Number) if at least one of the two velocity components is out of a specified global range.

Parameters:
  • u (2d np.ndarray) – a two dimensional array containing the u velocity component.
  • v (2d np.ndarray) – a two dimensional array containing the v velocity component.
  • u_thresholds (two elements tuple) – u_thresholds = (u_min, u_max). If u<u_min or u>u_max the vector is treated as an outlier.
  • v_thresholds (two elements tuple) – v_thresholds = (v_min, v_max). If v<v_min or v>v_max the vector is treated as an outlier.
Returns:

flag – a boolean array. True elements corresponds to outliers.
Return type:

boolean 2d np.ndarray