Splitting Wind direction into four quadrants
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Hello,
I had u & V component of wind. I converted them to wind speed & direction, using
wind_speed=sqrt((u^2)+(v^2));
wind_direction=180 + atand(u/v);
The problem is wind direction is not splitting into quadrants. As done here http://wx.gmu.edu/dev/clim301/lectures/wind/wind-uv.html
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採用された回答
Chad Greene
2016 年 1 月 15 日
I think Kelly is partly correct. You'll need the four-quadrant version of atand, which is called atan2d.
Another quick tip: Instead of this:
wind_speed=sqrt((u^2)+(v^2));
you can use
wind_speed=hypot(u,v);
which is less prone to typos.
その他の回答 (1 件)
Kelly Kearney
2016 年 1 月 15 日
As mentioned in those lecture notes, you'll need to use atan2 instead of atan (not atand either... your inputs aren't in degrees!) to get the four-quadrant result you want.
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Kelly Kearney
2016 年 1 月 15 日
Right, never mind on the degrees comment. I was mistakenly reversing inputs and outputs in my head. But as Chad answered, you still need the atan2d variant.
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