>
> I'm learning NCL as a working script language now,
> So maybe my qestions is simple.:)
>
> 1. How to substitute or define a new value during processing?
> For example, I want a anomalies percentage, but the climate
> mean value is zero,so I need to set such data to be a
> missing_value or Fill_Value.
if the variable is "x" and you want the missing value to be zero, then
x@_FillValue = 0.0
If you want a different missing value to be used [eg: -999.] the
x@_FillValue = 0.0 ; identigy 0.0 as the _FillVale
x@_FillValue = -999. ; change all 0.0 to -999.
> Could I use a simple function or procedure to do it ?
No need.
> Do I have to use loops to do it for all grid ?
Never.
> 2. I want to get a contour map with a color fill
> and a simple thick line(zero value) on it.
http://www.ncl.ucar.edu/Applications/index.shtml
Plot Techniques ==> Contour effects
See Example 1
Just set the gsnContourZeroLineThicknessF resource
eg: res@gsnContourZeroLineThicknessF = 2.0
> Such 3 similar are expected to be paneled. I do
> know to use overlay to get such contour effect
> for only one map.But how to do for 3 in one workstation?
There are numerous panel examples:
http://www.ncl.ucar.edu/Applications/index.shtml
Plot Types ==> Panels
good luck
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