Re: contour with multi-values

From: Adam Phillips <asphilli_at_nyahnyahspammersnyahnyah>
Date: Thu May 12 2011 - 09:47:25 MDT

Hi Ahmed,
That looks to me that at the bottom of your plot that your data field
quickly drops from > .9 to > .1.. Thus, I think there are 9 contour
lines immediately next to one another, and thus the labels all look like
they are on line. (Notice the 0 "line" appears thicker than the others.)
You can check this by setting trYMaxF = 3.0 and trXMaxF = 3.0 to zoom in
on your plot.

Looking at your script I see you are reading in an ascii file and are
not setting the _FillValue attribute. Does your data have any missing
data? Regardless, you should set the @_FillValue appropriately.

You might want to use the printMinMax procedure to look at the minimum
and maximum values of your array as well:
http://www.ncl.ucar.edu/Document/Functions/Contributed/printMinMax.shtml

Finally, if those values near the bottom of your script are indeed 0 or
some other small value you can use the where function to set those areas
= @_FillValue if you would like:
http://www.ncl.ucar.edu/Document/Functions/Built-in/where.shtml
Hope that helps!
Adam

On 05/12/2011 08:56 AM, ahmed lasheen wrote:
> Hello,
> I am trying to plot ASCII data file in which there is 20 rows and 10
> columns .
> the problem is that the first line contour is marked with several values .
> i have attached the data file and the NCL script.
> thanks in advance .
>
>
>
> --
> ===============
> Ahmed Lasheen
> Junior researcher at Cairo Numerical Weather Prediction Center (CNWPC)
> Egyptian Meteorological Authority(EMA)
> Cairo,Egypt
> ===============
>
>
>
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-- 
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Adam Phillips 
asphilli@ucar.edu
National Center for Atmospheric Research   tel: (303) 497-1726
Climate and Global Dynamics Division         fax: (303) 497-1333
P.O. Box 3000				
Boulder, CO 80307-3000    http://www.cgd.ucar.edu/cas/asphilli
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Received on Thu May 12 09:47:39 2011

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