pyart.retrieve.vad_browning#

pyart.retrieve.vad_browning(radar, velocity, z_want=None, valid_ray_min=16, gatefilter=None, window=2, weight='equal', sign=1)[source]#

Velocity azimuth display. Note: This code is a multi-sweep (volume) version of the Browning VAD code It computes the VAD separately for every sweep and averages the results

Parameters:

  • radar (Radar) – Radar object used.

  • velocity (string) – Velocity field to use for VAD calculation.

Other Parameters:

  • z_want (array) – Array of desired heights to be sampled for the vad calculation.

  • valid_ray_min (int) – Amount of rays required to include that level in the VAD calculation.

  • gatefilter (GateFilter) – A GateFilter indicating radar gates that should be excluded when from the import vad calculation.

  • window (int) – Value to use for window when determining new values in the _Averag1D function.

  • weight (string) – A string to indicate weighting method to use. ‘equal’ for equal weighting when interpolating or ‘idw’ for inverse distribution squared weighting for interpolating. Default is ‘equal’.

  • sign (int, optional) – Sign convention which the radial velocities in the volume created from the sounding data will will. This should match the convention used in the radar data. A value of 1 represents when positive values velocities are towards the radar, -1 represents when negative velocities are towards the radar.

Returns:

  • height (array) – Heights in meters above sea level at which horizontal winds were sampled.

  • speed (array) – Horizontal wind speed in meters per second at each height.

  • direction (array) – Horizontal wind direction in degrees at each height.

  • u_wind (array) – U-wind mean in meters per second.

  • v_wind (array) – V-wind mean in meters per second.

  • Reference

  • ———-

  • K. A. Browning and R. Wexler, 1968 (The Determination)

  • of Kinematic Properties of a Wind Field Using Doppler

  • Radar. J. Appl. Meteor., 7, 105–113