contour plot problem

Hello:

I used the ncl script as shown below to plot. When I set:

  res@mpMinLatF = -55 ; range to zoom in on
  res@mpMaxLatF = -25.
  res@mpMinLonF = 160.
  res@mpMaxLonF = 180.

The plotted figure is OK. However, when I set

res@mpMaxLonF = 190. ;instead of 180.

The plotted figure is quite odd. It shows all the map between -25 S and -55 S of the earth, instead of the region from 160E to 170W.

Can you tell me what is wrong with my setting? Thank you!

Regards
Ed

 begin
 files = "uas_2000.nc"

f = addfile(files, "r")
T = f->uas(10,{-55:-25},{160:190})

 wks = gsn_open_wks("x11" ,"ce") ; open a ps file

  gsn_define_colormap(wks,"BlAqGrYeOrRe") ; choose colormap

  res = True ; plot mods desired

  res@cnFillOn = True ; turn on color fill
  res@cnLinesOn = False ; turn of contour lines
  res@cnLevelSpacingF = 0.5 ; contour spacing
  res@gsnSpreadColors = True ; use full range of color map
  res@lbLabelStride = 4
res@lbOrientation ="vertical"
; res@pmTickMarkDisplayMode = "Always"; use NCL default lat/lon labels

  res@gsnAddCyclic = False ; data already has cyclic point
                                       ; this must also be set for any zoom

  res@mpMinLatF = -55 ; range to zoom in on
  res@mpMaxLatF = -25.
  res@mpMinLonF = 160.
  res@mpMaxLonF = 180.

  plot = gsn_csm_contour_map(wks,T, res)
end

      
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Received on Thu, 15 Oct 2009 16:50:55 -0700 (PDT)