[ncl-talk] Plotting station data as contour

[Dennis Shea]

interpolation For plotting,  interpolation to a grid is *NOT* necessary.

*http://www.ncl.ucar.edu/Applications/station.shtml*
<http://www.ncl.ucar.edu/Applications/station.shtml>
Example 1
============
*http://www.ncl.ucar.edu/Applications/contour1d.shtml*
<http://www.ncl.ucar.edu/Applications/contour1d.shtml>
Examples 1 & 3
===============================================
Keep in mind, *if you do not have physics to guide you*

(1) there is *no substitute* for lots of data points.
(2) extrapolation is *always* dangerous
================================================
*Unstructured to Grid:*


*https://www.ncl.ucar.edu/Applications/ESMF.shtml*
<https://www.ncl.ucar.edu/Applications/ESMF.shtml>
Example 21
=====
*http://www.ncl.ucar.edu/Applications/contour1d.shtml*
<http://www.ncl.ucar.edu/Applications/contour1d.shtml>

Some *interpolation* functions that may be of use.

*http://www.ncl.ucar.edu/Document/Functions/Contributed/cssgrid_Wrap.shtml*
<http://www.ncl.ucar.edu/Document/Functions/Contributed/cssgrid_Wrap.shtml>
*http://www.ncl.ucar.edu/Document/Functions/Contributed/obj_anal_ic_Wrap.shtml*
<http://www.ncl.ucar.edu/Document/Functions/Contributed/obj_anal_ic_Wrap.shtml>
*https://www.ncl.ucar.edu/Document/Functions/Contributed/triple2grid_Wrap.shtml*
<https://www.ncl.ucar.edu/Document/Functions/Contributed/triple2grid_Wrap.shtml>

*See Examples 3 & 4*
*https://www.ncl.ucar.edu/Applications/rdm2grid.shtml#ex3*
<https://www.ncl.ucar.edu/Applications/rdm2grid.shtml#ex3>

On Tue, Feb 5, 2019 at 11:53 AM MeteoBB <info at meteo-bb.de> wrote:

> Thx Rick for your quick response.
>
> Playing a little bit with the smooth-Parameter of the cn-resources yields
> the plot attached.
>
> *res at cnSmoothingOn        = True*
> *res at cnSmoothingDistanceF = 0.005 ;(usw 0.005 ... 0.03)*
>
> An area left is getting colored. (there is no station!)
> This is risky i think, if I set the parameter (hardcoded). I never know
> what the graphics will look like.
>
> Do you think i should try interpolate the station data from my
> unstructured grid to a rectilinear grid using *natgrid*?
>
> MeteoBB
>
> Am 05.02.2019 um 19:04 schrieb Rick Brownrigg:
>
> You might take a look at the several resources associated with "
> *cnSmoothingOn"  *
>
> HTH...Rick
>
> On Tue, Feb 5, 2019 at 10:22 AM MeteoBB <info at meteo-bb.de> wrote:
>
>> Hello,
>>
>> I tried to plot station data of surface temperature on a map as a contour
>> plot. I'm not satisfied with the result (see attached picture AreaFill.png).
>> It all seems so angular. My grid is not regular because of the station
>> data.
>>
>> Switching from AreaFill to RasterFill results in a litte better plot
>> (smooth contours) as you can see in the picture attached (RasterFill.png).
>>
>> *res at cnFillMode = "AreaFill" res at cnFillMode = "RasterFill"*
>>
>> I tried to regrid the triangular mesh (unstructured) station data to a
>> structured grid using *natgrid*?
>> But it fails ...
>>
>> Do you have any ideas for a better plot? Or what is the correct way to
>> plot such station data as contour?
>>
>> Regards
>> MeteoBB
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