MATLAB: How to get the wind speed and direction values from u and v components

"wind speed & direction"

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.

Best Answer

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.

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MATLAB: Splitting Wind direction into four quadrants

I think Kelly is partly correct. You'll need the four-quadrant version of atand, which is called atan2d.

Another quick tip: Instead of this:

wind_speed=sqrt((u^2)+(v^2));

you can use

wind_speed=hypot(u,v);

which is less prone to typos.

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With respect to the delay, see if the finddelay (link) function will do what you want. (I believe it was introduced in R2015b. The documentation does not say specifically.)

To find the amplitudes at a specific frequency, use the fft (link) function, and compare (subtract or divide) the amplitudes at each frequency, or only your frequency-of-interest if you are only interested in one frequency. The signals must be the same length and have the same sampling frequency for this approach to work optimally.

Best Answer

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