[ncl-talk] gsn_csm_contour_map plot

[Dennis Shea]

By default, NCL uses a proprietary [fast] method for this type of graphic
rendering. Obviously, it was not great for this graphic.

It is best to use (say) *obj_anl_ic *and then use a USA shapefile to
eliminate 'noises' outside the  USA. See:

*http://www.ncl.ucar.edu/Applications/shapefiles.shtml*
<http://www.ncl.ucar.edu/Applications/shapefiles.shtml>
shapefiles_25 and shapefiles_26.

The raster style was used to illustrate the underlying grid onto which the
randomly spaced data were interpolated.
You can comment tor delet he RasterFil resource.

Good luck

On Mon, Nov 25, 2019 at 10:29 AM Wensong Weng via ncl-talk <
ncl-talk at ucar.edu> wrote:

> Dear NCL Group,
>
>
>
> I am using the gsn_csm_contour_map function to make a contour plot for the
> precipitation, see the attached. However, there are lots of un-wanted
> ‘noises’ outside of CONUS (no data).  The data is a one dimension array
> with unstructured grids. How can I get rid of those ‘noises’ and only draw
> the contour map over the CONUS.
>
>
>
> Your help is greatly appreciated,
>
>
>
> Wensong Weng
>
> York Univ.
>
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