NCL画垂直剖面图

用NCL画垂直剖面图的时候，总是感觉水平方向上的矢量要比垂直方向上的大（垂直方向上已经乘上了－100），并且画出来的垂直方向总是与GRADS画的方向相反。如图1（NCL），图2（grads)。

这是NCL默认的设置。

The problem is that by default NCL maps the vector direction into the underlying coordinate space. This is good when drawing on a map projection, but for vertical plots where the two coordinate axes have different units that have very different numerical spacing between the coordinate values it leads to distortion. There is a simple fix, which is to set the resource vcMapDirection to False.

加上res@vcMapDirection = False这一设置之后，画的图与GRADS一样，垂直方向上只需乘上100即可。如图3.