[ncl-talk] myterious contours not from the input data

[Mary Haley]

Sorry, I didn't realize you had already provided the data. We are looking
into this.

However, it looks like your plot has X and Y coordinate values, but when we
run the plot we don't have the same coordinates, so the plot is very
different.

Can you provide us with the image that you get when you run the exact same
script that you provided in this email, so we can compare?

Thanks,

--Mary


On Wed, Jun 24, 2015 at 1:31 PM, Mary Haley <haley at ucar.edu> wrote:

> Hi Ning,
>
> Alan's suggestion is a good one, but I would still like to look into why
> the default contouring in NCL is not working as expected on this data set.
>
> Can you provide the CSV files that go with this script?
>
> If they are not too large, you can email them to me directly.
>
> Otherwise, you can use our ftp:
>
> http://www.ncl.ucar.edu/report_bug.shtml#HowToFTP
>
> Thanks,
>
> --Mary
>
> On Sun, Jun 21, 2015 at 8:33 PM, Ning Li <ning.li at auckland.ac.nz> wrote:
>
>>  Dear NCL users,
>> I have encountered a problem relating to the plotting of contour lines.
>> The data to be plotted is an 8 by 8 matrix that looks like this.
>>
>>   -0.084 -0.066 -0.04 0.021 0.031 -0.026 -0.065 -0.075  -0.028 0.005
>> 0.053 0.177 0.224 0.136 0.028 -0.003  -0.009 0.038 0.111 0.266 0.327
>> 0.333 0.221 0.101  -0.049 -0.024 0.08 0.184 0.275 0.352 0.29 0.152
>> -0.046 -0.029 0.022 0.082 0.164 0.195 0.147 0.127  0.002 0.007 -0.005
>> -0.017 -0.02 0.006 0.05 0.059  0.03 0.022 -0.034 -0.095 -0.105 -0.069
>> -0.033 -0.016  0.043 0.035 0.011 -0.022 -0.053 -0.063 -0.045 -0.03
>> While the script is working fine with the 'cnFillOn' resource set to
>> True, erroneous contour lines
>> are present when 'cnFillOn' resource is set to False (please see the
>> attached images).
>>
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>> * load "$NCARG_ROOT/lib/ncarg/nclscripts/csm/gsn_code.ncl" load
>> "$NCARG_ROOT/lib/ncarg/nclscripts/csm/gsn_csm.ncl" diri =
>> "/home/nli045/Desktop/sharedJ/Documents/data/" fili = systemfunc("ls " +
>> diri + "x*csv") in = asciiread(fili(0),(/8,8/),"float")
>> ; read the matrix from the directory wks = gsn_open_wks("png","test")
>> colors = read_colormap_file("BlWhRe") res                              =
>> True res at cnFillOn             = False                  ; CONTOURS WRONG!
>> res at cnLinesOn          = True                  res at gsnAddCyclic     =
>> False                 ; the plot is not global res at cnLevelSelectionMode
>> = "ManualLevels"    ; manual contour levels res at cnMinLevelValF
>>     = -0.1 res at cnMaxLevelValF              =  0.5
>> res at cnLevelSpacingF             =  0.1 plot =
>> gsn_csm_contour(wks,in,res)    *
>>
>> I used R to make the plot and there is no problem.
>> I have also used a different dataset in NCL, the errorneous contours are
>> also present (see the circled contours in 'datasetB.png').
>>
>> I am using version 6.2.0. The system is 86-64 GNU/Linux.
>>
>> I wonder if anyone experienced the same problem in the past and how
>> should it be resolved?
>>
>> Any help would be great! Thank you very much!
>>
>>  Ning LI
>>
>> PhD candidate
>> School of Environment
>> The University of Auckland
>>
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>>
>
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