[ncl-talk] gsn_contour_map, zoom in plot problem

[Ying Song]

Hello, ncl helper,

I trying to plot MERRA-2 reanalysis data in NCL using gsn_contour_map. I am
only interested in west coast of US.  But I can not get the zoom in plot
correctly by using resources:

  res at mpMinLatF               = 30
  res at mpMaxLatF               = 45
  res at mpMinLonF               = -130
  res at mpMaxLonF               = -110

The warning shows:
warning:ContourPlotDraw: out of range coordinates encountered; standard
AreaFill rendering method may be unreliable;
 consider setting the resource trGridType to "TriangularMesh" if
coordinates contain missing values

Attachment is my script. The info of MERRA-2 O3 data from printVarSummary
is:
 ------------------------------
Variable: o3
Type: float
Total Size: 279465984 bytes
            69866496 values
Number of Dimensions: 4
Dimensions and sizes:   [time | 8] x [lev | 42] x [lat | 361] x [lon | 576]
Coordinates:
            time: [0..1260]
            lev: [1000..0.1000000014901161]
            lat: [ -90..  90]
            lon: [-180..179.375]
Number Of Attributes: 11
  long_name :   ozone_mass_mixing_ratio
  units :       kg kg-1
  _FillValue :  1e+15
  missing_value :       1e+15
  fmissing_value :      1e+15
  scale_factor :         1
  add_offset :   0
  standard_name :       ozone_mass_mixing_ratio
  vmax :        1e+15
  vmin :        -1e+15
  valid_range : ( -1e+15, 1e+15 )
---------------------------------------------------------
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