[ncl-talk] "Noise" when plotting station data

[Meina Wang]

Dear NCL users:

I ran into a problem when trying to use the function gsn_csm_contour_map_ce to
plot station data (with latitude and longitude).  I followed this example
<https://www.ncl.ucar.edu/Applications/Scripts/station_1.ncl>form NCL
website and got the figure with "noise" over region where there is no input
data point (over Nevada).  The plot is attached below, with black dots
showing the data points, and color contour underneath is plotted from
gsn_csm_contour_map_ce function, so there is no data over Nevada, while
the function still extrapolate values over there.

Below are the main res setting for plotting station data:

  res at sfXArray                    = lons

  res at sfYArray                    = lats


  plot=gsn_csm_contour_map_ce(wks,w,res1)


Has any one had this problem before?  Any thoughts or suggestion is much
appreciated!  Thank you.

​Best,
Meina

-- 
Meina Wang
PhD candidate in Atmospheric Science
Department of Land, Air and Water Resources
University of California, Davis
Davis, CA 95616
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