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Wind measurement: Difference between revisions
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Wind speed is measured using an [http://en.wikipedia.org/wiki/Anemometer anemometer]. It is typically made up of cups attached to spindle. The stronger the wind the faster the cups rotate and the higher the reading. Several readings should be taken over a couple of minutes and an average taken. The measurement is usually made in [http://en.wikipedia.org/wiki/Knot_%28unit%29 knots] or miles per hour but may be converted to metres per second or kilometres per hour.
Cumulus [[Cumulus.ini|supports]]:
*0 = m/s (metres per second)
*1 = mph (miles per hour)
*2 = km/h (kilometres per hour)
*3 = kts (nautical knots)
==Compensation==
Raising an anemometer to a height of 10 metres in an open space requires a strong mast with tensioned wires, and is not always possible, especially for weather enthusiasts, therefore one must build in a compensation figure (or multiplier) in order to take into account the height factor.
It is generally accepted that the following formula will provide a multiplier to compensate for lower height anemometer.
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