Measure-Correlate-Predict

In order to calculate your site's long term average wind speed Heidra uses an industry standard measure-correlate-predict procedure.

At the same time as accurate on-site wind data is measured, Heidra logs freely available, hourly Met Office measurements nearest to your site. Depending on how windy your location is, the site data will either have a larger or lower wind speed than that recorded by the Met Office.

Heidra uses industry standard software to calculate the adjustment to the Met Office data for it to agree with your site data. The figure below has been adjusted in this manner.

Once the mathematical adjustment has been determined, it is applied to the long term (10 years) data published for the Met Office site. The result is the long term wind speed distribution at your site.

In order to ensure reliable results the procedure is applied to individual wind direction sectors giving a set of adjustment factors. The same procedure is followed for wind direction to give an accurate long-term wind rose.

The mathematical term for the adjustment is 'correlation' and the above procedure is known as Measure-Correlate-Predict (MCP). It is a standard procedure for the large scale wind industry but Heidra is the first to bring this approach within reach of smaller developments. It is the only recognised way of predicting long term averages at an individual site.