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 -- View this message in context: http://rrd-mailinglists.937164.n2.nabble.com/How-store-wind-vector-data-tp7581910p7581915.html Sent from the RRDtool Users Mailinglist mailing list archive at Nabble.com. _______________________________________________ rrd-users mailing list [email protected] https://lists.oetiker.ch/cgi-bin/listinfo/rrd-users
