[ncl-talk] gsn_csm_contour_map plot

[Dennis Shea]

Please *always* include ncl-talk.

FYI: In 2014 Mary Haley created a 43-minute *webinar*
<http://www.ncl.ucar.edu/Training/Webinars/NCL_and_Shapefiles/>
introduction to shapefiles and how to use shapefile data in NCL It provides
a lot general shapefile information.I think this is quite good.
----
tar file attached

The United States Census cartographic boundary shapefile,
*cb_2018_us_nation_5m.zip*, was downloaded from:
*https://www.census.gov/geographies/mapping-files/2018/geo/carto-boundary-file.html*
<https://www.census.gov/geographies/mapping-files/2018/geo/carto-boundary-file.html>

Good luck

On Mon, Dec 2, 2019 at 10:44 AM Wensong Weng <wsweng at yorku.ca> wrote:

> Hi Dennis,
>
> Thanks very much for what you have done.
>
> Where can I download those shapefiles you have used in the shapefiles_25
> and shapefiles_26 ( I did a brief search and could not find them)?
>
> Thanks again,
>
> Wensong
>
>
> ------------------------------
> *From:* Dennis Shea <shea at ucar.edu>
> *Sent:* Monday, December 2, 2019 11:29 AM
> *To:* Wensong Weng <wsweng at yorku.ca>
> *Cc:* ncl-talk at ucar.edu <ncl-talk at ucar.edu>
> *Subject:* Re: [ncl-talk] gsn_csm_contour_map plot
>
> 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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