[ncl-talk] No valid values in scalar field

[Ciao Kai Liang]

Hi Dennis,

I'm so sorry for causing this inconvenience. As I didn't see my question
posted, I do it again. Thank you for your instruction. The problem is
solved. It turns out some values are set to be  _FillValue :  9.96921e+36
as I create a new metric in the first place. Thank you

CiaoKai

2016-06-19 20:51 GMT+08:00 Dennis Shea <shea at ucar.edu>:

> I think you already posted this question.
>
> You did not do As I suggested:
>
> 1]
> The 'golden-rule' of data processing is **look at your data**.
> Did you look at the variable?
>
> file   = "dox_mean_2010_05x05.nc"
> a = addfile(file,"r")
> dox   = a->ozone        ;720x360x24
>
> do i=0,2   ; 23
>     printMinMax(dox(:,:,i), 0)  ; print Min and max for each level
> end do
>
> Maybe the values are all _FillValue.
>
> ===
>
> [2]
> Please use the following simple code. This illustrates what you get when
> you try to plot a variable that contains only  _FillValue
>
>   x    = new ( (/50,30/), "float", 1e10)                 ; all _FillValue
>   wks  = gsn_open_wks("x11","tst_FillValue")
>   plot = gsn_csm_contour(wks,x,False)            ; contour the variable
>
>
> warning:ContourPlotInitialize: no valid values in scalar field;
> ContourPlot not possible:[errno=1101]
>
> On Sat, Jun 18, 2016 at 9:22 AM, Ciao Kai Liang <ciaokailiang at gmail.com>
> wrote:
>
>> Hi,
>>
>> I have one variable "dox" with (360x720x24). It is ozone global map and
>> contains 24 different perturbation results. I would like to plot them on
>> multiple panels in a single sheet. However, I don't know why I can't plot
>> the first 3 (see pic). The output of "dox"from printVarSummary and plotting
>> script shows below.
>>
>> Thx
>> CiaoKai
>>
>>
>> dox-----------------------------------------------------------------------------
>> Variable: dox
>> Type: float
>> Total Size: 24883200 bytes
>>             6220800 values
>> Number of Dimensions: 3
>> Dimensions and sizes:   [lat | 360] x [lon | 720] x [24]
>> Coordinates:
>>             lat: [-89.75..89.75]
>>             lon: [-179.75..179.75]
>> Number Of Attributes: 1
>>   _FillValue :  9.96921e+36
>>
>> plot
>> script----------------------------------------------------------------------------------------------
>>
>> plots = new(24,graphic)
>>   wks_type = "png"
>>   wks_name = "dox_panel"
>>   wks = gsn_open_wks(wks_type,wks_name)         ; send graphics to PDF
>> file
>>
>>   res                              = True
>>   res at gsnDraw              = False              ; don't draw
>>   res at gsnFrame             = False              ; don't advance frame
>>
>>   res at cnLevelSelectionMode = "ManualLevels"     ; set manual contour
>> levels
>>   res at cnMinLevelValF       = -2.                ; set min contour level
>>   res at cnMaxLevelValF       =  2.                ; set max contour level
>>   res at cnLevelSpacingF      =  1.                ; set contour spacing
>>
>>   res at cnFillOn          = True
>>   res at cnLinesOn         = False
>>   res at cnLineLabelsOn    = False
>>   res at lbLabelBarOn      = False
>>   res at cnFillPalette     = "BlWhRe"              ; Blue-Red colormap
>>   res at gsnRightString    = "ppb"                 ; "~" is txFuncCode
>>
>>   leftstring = (/"a","g","m","b","h","n",\
>>                  "c","i","o","d","j","p",\
>>                  "e","k","q","f","l","r",\
>>                  "s","t","u","v","w","X"/)
>>
>>   do i=0,23
>>     res at gsnLeftString  =  "("+leftstring(i)+")"
>>     plots(i) = gsn_csm_contour_map_ce(wks,dox(:,:,i),res)
>>   end do
>>
>>   pnlres = True
>>   pnlres at txString          = "Dox"
>>   pnlres at gsnPanelLabelBar  = True
>>   pnlres at lbLabelAutoStride = True
>>
>>   gsn_panel(wks,plots,(/6,4/),pnlres)
>>
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>


-- 
---------------------------------------------------------------------------------------------------------
CiaoKai Liang
919-808-8069
ckliang at live.unc.edu
University of North Carolina, Gillings School of Global Public Health
170 Rosenau Hall, CB #7400 | 135 Dauer Drive | Chapel Hill, NC 27599-7400
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