[ncl-talk] Zooming Functions Clarification

[Illston, Bradley G.]

NCL Users,

I am one to try and figure my problems on their own, but I am a bit stumped after working on this for a few days. I am trying to zoom my map in to a set of bounding latitudes and longitudes in my domain to no avail. I kept trying various iterations utilizing ZoomIn or mpMinLatF/mpMinLonF/etc. I am not sure when you should use one and when you would use the other. Below is my latest script that works, but not zoomed in. When I run it, I get the following warnings:

warning:mpLimitMode is not a valid resource in /tair_24hr_2011_2008091502_contour at this time
warning:mpMinLonF is not a valid resource in /tair_24hr_2011_2008091502_contour at this time
warning:mpMaxLonF is not a valid resource in /tair_24hr_2011_2008091502_contour at this time
warning:mpMinLatF is not a valid resource in /tair_24hr_2011_2008091502_contour at this time
warning:mpMaxLatF is not a valid resource in /tair_24hr_2011_2008091502_contour at this time

Am I mixing various gsn functions that is causing a confusion? Is there a preferred one for plotting basic WRF output (in NetCDF format) to a PNG file? Any thoughts? Thank you so much.

Cheers,
Brad Illston

load "$NCARG_ROOT/lib/ncarg/nclscripts/csm/gsn_code.ncl"
load "$NCARG_ROOT/lib/ncarg/nclscripts/csm/gsn_csm.ncl"
load "$NCARG_ROOT/lib/ncarg/nclscripts/wrf/WRFUserARW.ncl"

begin

;---Define colormap. First is background color, second is foreground color
  colors = (/(/255, 255, 255/),(/0, 0, 0/),(/255, 255, 255/),(/088, 164, 074/),(/047,124,062/),(/055, 072, 114/),(/095,129,183/),(/094,165,212/),(/116,196,205/),(/135,099,162/),(/128,076,144/)/) / 255.

;---Open WRF output file
  a = addfile(wrf_filename,"r")

  print("  NetCDF file = "+wrf_filename)
  print("  Output image = "+output_png)

;---Read temperature at first time step
  tc = wrf_user_getvar(a,"T2",0)
  tc at long_name = "2m Air Temperature"
  tc at units = "C"
  tc=tc-273.15
  wks = gsn_open_wks("png",output_png)
  gsn_define_colormap(wks,"WhiteBlueGreenYellowRed")                ; choose colormap
; gsn_define_colormap(wks,colors)

;---Resources for filled contour plot
  res                      = True

  res at cnFillOn             = True
  res at cnLinesOn            = False
  res at gsnMaximize          = True

  res at tiMainString         = run_length + " Run (" + year + ") - " + run_date + " " + end_time + " UTC"
  res at Footer               = False
  res at FieldTitle           = "2m Air Temperature"
  res at lbTitleOn            = True
  res at lbTitleString        = ""
 res at NoHeaderFooter       = True            ; Switch headers and footers off

  res at cnLevelSelectionMode = "ExplicitLevels"
  res at cnLevels             =  (/10,11,12,13,14,15,16,17,18,19,20,21,22,23,24,25/)
; res at ContourParameters = (/10,25,1/)      ; Contour levels

  res at mpLimitMode            = "LatLon"
  res at mpMinLatF              =   35
  res at mpMinLonF              =  -98
  res at mpMaxLatF              =   36
  res at mpMaxLonF              =  -97

  contour = wrf_contour(a,wks,tc,res)        ; Create contour plot

  pltres                      = True         ; Basic overlay plot options
  pltres at PanelPlot            = True         ; Tells wrf_map_overlays not to remove overlays

  mpres                       = True         ; Set map options
  mpres at mpOutlineOn           = True         ; Turn on map outlines
  mpres at mpFillOn              = False        ; Turn off map fill
  mpres at mpDataBaseVersion     = "Ncarg4_1"
  mpres at mpDataSetName         = "Earth..2"   ; For counties
  mpres at mpOutlineBoundarySets = "GeophysicalAndUSStates"
  mpres at mpOutlineSpecifiers   = (/"Land", "Oklahoma:counties"/)
  mpres at tiMainString          = run_length + " Run (" + year + ") - " + run_date + " " + end_time + " UTC"
  mpres at gsnMaximize           = True

;---Create the contours over the WRF map (nothing will be drawn yet).
  plot = wrf_map_overlays(a,wks,contour,pltres,mpres)

end
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