[ncl-talk] spline error/warning

[Marston Johnston]

Hi Mary,

Apologies. I spent the day digging into the data.
The gsnAddCyclic = False didn’t work but as it turns out, 
that was not the true cause of the problem. My NOAA18 MHS data 
was expressed on a 180:-180 grid and
when I converted this to 0:360 the results had two lon points that were 180.
When I fixed this, the problem disappeared.

Appreciate the tips. My question was mainly answered,
which was that the plot NCL didn’t do anything crazy. 

Thanks,
/M
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
Marston S. Johnston, PhD
Department of Earth Sciences
University of Gothenburg, Sweden
Email: marston.johnston at gu.se <mailto:marston.johnston at gu.se> 
Phone: +46-31-7862859 
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
Only the fruitful thing is true!

> On 24 May 2015, at 18:21, Mary Haley <haley at ucar.edu> wrote:
> 
> Did you try setting the gsnAddCyclic resource to False, as the error message suggested? It is True by default (in most cases).
> 
> --Mary
> 
> 
> On Sat, May 23, 2015 at 3:45 AM, Marston Johnston <shejo284 at gmail.com <mailto:shejo284 at gmail.com>> wrote:
> Hi,
> 
> I’m trying to plot some data using the contour plot function: gsn_csm_contour_map
> But I keep getting this annoying error/warning:
> 
> gsn_add_cyclic: Warning: The range of your longitude coordinate array is at least 360.
> (0) You may want to set gsnAddCyclic to False to avoid a warning
> (0) 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
> 
> The plot looks good so I’m wondering if I need to do anything about this warning/error?
> 
> Appreciate any advice on this,
> 
> /M
> 
> ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
> Marston S. Johnston, PhD
> Department of Earth Sciences
> University of Gothenburg, Sweden
> Email: marston.johnston at gu.se <mailto:marston.johnston at gu.se> 
> Phone: +46-31-7862859 <tel:%2B46-31-7862859> 
> ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
> Only the fruitful thing is true!
> 
> 
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