How can I get the wind speed and direction values from u and v components?

As the quiver function shows speed and direction by arrows, there might be a built in function to get the speed and direction values.

Could anyone help please.

Answer 1

[Star Strider]

The ‘u’ and ‘v’ are the ‘x’ and ‘y’ components of the plotted vector. To get the magnitude, use the hypot function, and to get the direction, use the atan2 function. You can use these little utility functions to convert the atan2 or atan2d output to [0,p2*pi] or [0,360] representation:

Angles360 = @(a) rem(360+a, 360);                        % For ‘atan2d’
Angles2pi = @(a) rem(2*pi+a, 2*pi);                      % For ‘atan2’

These results will correspond to the mathematical convention for angle orientation, not the compass convention.

Answer 2

[Walter Roberson]

If you have an existing quiver plot, then you can extract is UData and VData properties.

However, if you have an existing quiver plot it is usually easier to just take a copy of the u and v data that you used to create the plot.