Calculation of Turbulence Intensity on SDR wind rose report

Turbulence intensity (Ti)is defined as the windspeed interval standard deviation (SD) divided by the windspeed interval average (AVG)...

Ti = SD/AVG

On the windrose, the samples are first sorted by direction into sectors. In each sector, there will be "n" samples. A Ti is calculated for each sample and an average Ti is then created for the sector...

WindRose Ti for each sector = (SD/AVG + SD/AVG + SD/AVG...n)/n

Note that SDR defaults to 16 sectors for a standard windrose.