Wind direction minimum and maximum calculation - AWS810

AWS810 System Description
Document code
M212417EN
Revision
H
ft:locale
en-US
Product
AWS810
Document type
Technical description

The following formulas are used:

Formula 1

d i f f ⁢ = W D i − W D A

Formula 2

Formula 2 is applied if diff > 180.

d i f f ⁢ = d i f f − 360

Formula 3

Formula 3 is applied if diff < −180.

d i f f ⁢ = d i f f + 360

Formula 4

M I N D I F F ⁢ = min ⁡ ( d i f f s )

Formula 5

M A X D I F F ⁢ = max ⁡ ( d i f f s )

Formula 6

W D M I N ⁢ = W D [ M I N D I F F ]

Formula 7

W D M A X ⁢ = W D [ M A X D I F F ]
Explanation of wind direction minimum and maximum calculation formulas
Item Explanation
WDi Wind direction in degrees
WDA Wind direction average
diff Difference between WDi and WDA scaled between [−180, 180]
diffs A list containing all calculated diff values
MINDIFF Minimum difference between WDi and WDA scaled between [−180, 180]
MAXDIFF Maximum difference between WDi and WDA scaled between [−180, 180]
WDMIN Minimum wind direction from input list with no scaling applied
WDMAX Maximum wind direction from input list with no scaling applied
Inputs for wind direction minimum and maximum calculation
Input Variable
Wind directions

List of wind directions:

  • For longer averages the list of 3‑second averages from the time window
Wind direction average Wind direction for the given measurement window