A description of wind as an energy source will require a combination of aerological and energy characteristics of wind unified into a concept of wind power cadastre. These cadastral characteristics include [5,13]: average annual wind speed; annual and daily wind cycle; recurrence rate of wind speeds; recurrence rate of wind directions; maximum wind speed; specific wind intensity and specific wind power; and wind power resources of a particular area.
The main source of initial data to be compiled into a wind power cadastre is observations of wind speeds carried out by the basic network of a weather service. These observations, performed several times throughout the day, cover periods of time spanning over decades and therefore represent ample factual material. The advantage offered by such surveys is that they are conducted using a globally accepted array of methods, while the surveillance sites fall into specific categories according to the particular degree to which each can be viewed as an open-air area.
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