[ncl-talk] gsnadd cyclic

[Dennis Shea]

Assuming that the source TRMM array (P) is 'global' (eg: 60S-60N, all
longitudes);
P(lat,lon)   an

   lonL = 100.0
   lonR = 120.0
   latS  = -20.0
   latN  = 10.0

[1]
If the array being passed to the plot function is not cyclic in longitude
then you use

                                                  ; pass subset of global
array
   res at gsnAddCyclic = False
   plot = gsn_csm_contour_map(wks, P({latS:latN},{lonL:lonR}), res)

[2]
In the following, the full array 'P', which is cyclic in longitude,  is
being passed to the plot function so res at gsnAddCyclic=True (default) is
needed. The following 4 plot resources says to select the specified region
from the full grid and plot just that.

  res at mpMinLatF    = latS     ; range to zoom in on
  res at mpMaxLatF    = latN
  res at mpMinLonF    = lonL
  res at mpMaxLonF    = lonR

  res at gsnAddCyclic = True   ; default
  plot = gsn_csm_contour_map(wks, P , res)

Good Luck


On Wed, Dec 30, 2015 at 10:16 PM, Saurabh Singh <saurabhsingh123op at gmail.com
> wrote:

>
> ​
> Dear Sir
>
>
> I am trying to plot two TRMM plots for my study domain. In the left option
> i add the option  res at gsnAddCyclic =True while right one
> with  res at gsnAddCyclic =False. I did all this experimenting because i got
> a warning as follows :
>
> *(0)     gsn_add_cyclic: Warning: The range of your longitude data is not
> 360.*
> *(0)     You may want to set the gsnAddCyclic resource to False to avoid a*
> *(0)     warning message from the spline function.*
> *warning:_NhlCreateSplineCoordApprox: Attempt to create spline
> approximation for X axis failed: consider adjusting trXTensionF value*
> *warning:IrTransInitialize: error creating spline approximation for
> trXCoordPoints; defaulting to linear*
>
> Now, i am confuses which plot to adopt for my analysis. Please, guide me
> through this, is there anty option in ncl_fildump whic h can tell me about
> the logic to be set for gsnAddCyclic.
>
> *Wish you guys a very happy new year, and thanks a lot for making our life
> so easy for our works on NetCdf data. I really adore you guys.*
>
> --
> With regards
> Saurabh Kumar singh
>
>  *P** : * *Please consider the environment before printing this e-mail*
>
>
>
>
> _______________________________________________
> ncl-talk mailing list
> ncl-talk at ucar.edu
> List instructions, subscriber options, unsubscribe:
> http://mailman.ucar.edu/mailman/listinfo/ncl-talk
>
>
-------------- next part --------------
An HTML attachment was scrubbed...
URL: http://mailman.ucar.edu/pipermail/ncl-talk/attachments/20151231/765f168d/attachment-0001.html 
-------------- next part --------------
A non-text attachment was scrubbed...
Name: cyclic_noncyclic.JPG
Type: image/jpeg
Size: 141420 bytes
Desc: not available
Url : http://mailman.ucar.edu/pipermail/ncl-talk/attachments/20151231/765f168d/attachment-0001.jpe