[ncl-install] VVECTR - VECTOR NDC LENGTH TOO GREAT

[Mary Haley]

Hi Izu,

For future reference, this kind of question is more appropriate for  
ncl-talk:

http://mailman.ucar.edu/mailman/listinfo/ncl-talk

Your script is using wrf_xxxx scripts, which I am not super familiar  
with.

However, you are getting numerous error messages, which leads me
to believe something might be wrong with the data, rather than the  
scripts.

I can't tell which wrf_vector call is giving you the error, so can
you try commenting out this line for both of them:

       opts at NumVectors = 30

to see if the "VECTOR NDC LENGTH" messages go away?

The wrf_vector script is trying to set the vector reference
length based on this setting, and there might be something
wrong there.

You should also check your vector data arrays to make
sure their values look like what you're expecting:

   printVarSummary(u10)
   printVarSummary(v10)
    print("min/max u10 = " + min(u10) + "/" + max(u10))
    print("min/max v10 = " + min(u10) + "/" + max(v10))

The "printVarSummary" output will indicate whether you have
a _FillValue, which indicates your missing value. Check this value
to make sure it is correct.

Do the same for your other vector data u_plane, v_plane.

With the contour error messages, it looks like you might be  passing in
a data array that's all constant (all equal to the same value):

   warning:ContourPlotInitialize: scalar field is constant;  
ContourPlot not possible:[errno=1102]

This won't hurt anything, but you will get a lot of messages  
complaining about it trying to
use the contour levels that you've specified.

You can do the same print statements on your contour data, if you  
want to see which one
is giving you the constant warning. Maybe you simply have a  
calculation somewhere
that is not correct.

--Mary

On Aug 12, 2009, at 1:20 AM, 孙超 wrote:

> Dear friemd £º
> When I run the script(the script which Iused is attached to the  
> letter.) to plot
> fields from a Global WRF run.I got the message as follow :
> "
> fatal:VectorPlotDraw: VVECTR - VECTOR NDC LENGTH TOO GREAT
> fatal:VectorPlotDraw: error drawing vectors
> fatal:VectorPlotDraw: draw error
> fatal:PlotManagerDraw: error in plot draw
> fatal:_NhlPlotManagerDraw: Draw error
> fatal:VectorPlotDraw: VVECTR - VECTOR NDC LENGTH TOO GREAT
> fatal:VectorPlotDraw: error drawing vectors
> fatal:VectorPlotDraw: draw error
> fatal:PlotManagerDraw: error in plot draw
> fatal:_NhlPlotManagerDraw: Draw error
> fatal:VectorPlotDraw: VVECTR - VECTOR NDC LENGTH TOO GREAT
> fatal:VectorPlotDraw: error drawing vectors
> fatal:VectorPlotDraw: draw error
> fatal:PlotManagerDraw: error in plot draw
> fatal:_NhlPlotManagerDraw: Draw error
> fatal:VectorPlotDraw: VVECTR - VECTOR NDC LENGTH TOO GREAT
> fatal:VectorPlotDraw: error drawing vectors
> fatal:VectorPlotDraw: draw error
> fatal:PlotManagerDraw: error in plot draw
> fatal:_NhlPlotManagerDraw: Draw error
> fatal:VectorPlotDraw: VVECTR - VECTOR NDC LENGTH TOO GREAT
> fatal:VectorPlotDraw: error drawing vectors
> fatal:VectorPlotDraw: draw error
> fatal:PlotManagerDraw: error in plot draw
> fatal:_NhlPlotManagerDraw: Draw error
> warning:ContourPlotInitialize: scalar field is constant;  
> ContourPlot not
> possible:[errno=1102]
> warning:ContourPlotSetValues: Data values out of range of levels  
> set by
> EXPLICITLEVELS mode
> warning:ContourPlotInitialize: scalar field is constant;  
> ContourPlot not
> possible:[errno=1102]
> warning:ContourPlotSetValues: Data values out of range of levels  
> set by
> EXPLICITLEVELS mode
> warning:ContourPlotInitialize: scalar field is constant;  
> ContourPlot not
> possible:[errno=1102]
> warning:ContourPlotSetValues: Data values out of range of levels  
> set by
> EXPLICITLEVELS mode
> warning:ContourPlotInitialize: scalar field is constant;  
> ContourPlot not
> possible:[errno=1102]
> warning:ContourPlotSetValues: Data values out of range of levels  
> set by
> EXPLICITLEVELS mode
> warning:ContourPlotInitialize: scalar field is constant;  
> ContourPlot not
> possible:[errno=1102]
> warning:ContourPlotSetValues: Data values out of range of levels  
> set by
> EXPLICITLEVELS mode
> warning:ContourPlotInitialize: scalar field is constant;  
> ContourPlot not
> possible:[errno=1102]
> warning:ContourPlotSetValues: Data values out of range of levels  
> set by
> EXPLICITLEVELS mode
> warning:ContourPlotInitialize: scalar field is constant;  
> ContourPlot not
> possible:[errno=1102]
> warning:ContourPlotSetValues: Data values out of range of levels  
> set by
> EXPLICITLEVELS mode
> "
> What should I do ?
> Give my best wishes to ncl.
>
>
>                                                         Yours  
> sincerely
>                                                         sun chao
>                                                         lzu
>
>
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