[rrd-users] How store wind vector data?

[Peter]

Because 0° is North and 90° East the formulas must be:
Wind_North = velocity * cos(direction * PI / 180)
Wind_East = velocity * sin(direction * PI / 180) 

velocity = Sqrt(Wind_North^2 + Wind_East^2)
direction = Atan2(Wind_North, Wind_East) * 180 / PI 



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