Re: contour with multi-values

Hi,

Just to follow up on Adam's comments, the missing _FillValue is indeed the problem. Or rather,
its that the default _FillValue is not the same as your data, which looking at it, I presume is "-999.0"(?)

Just add the line:

  f@_FillValue = -999.0

after you read the ascii dataset.

Rick

On May 12, 2011, at 9:47 AM, Adam Phillips wrote:

> 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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> --
> __________________________________________________
> Adam Phillips
> asphilli@ucar.edu
> National Center for Atmospheric Research tel: (303) 497-1726
> Climate and Global Dynamics Division fax: (303) 497-1333
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Received on Thu May 12 09:54:33 2011