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I am trying to understand wind speed as time series from a mast (tower). The names of the fields are v80a, v80b, v60a, v60b etc. Now I do know that v80 is the wind speed at 80 meters. But why use v80a and v80b etc.?

Can you please explain this or point me to some resources that provide an explanation?

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    To make a decent guess, probably we need a sample of the data, or a more detailed explanation of the source or program used. – philshem Apr 16 '16 at 8:23
  • Can you share where you obtained this data set? – Kermit Aug 21 '16 at 23:36
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I'll make a guess anyway.

a and b are the measurements from two anemometers, either used for redundancy (i.e. machine failure or numerical error), or for different sensitivity/directionality.

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