[ncl-talk] overlaying multiple layers on a map

[Alan Brammer]

Hey Joe,

Think you just need to use vfXArray and vfYArray instead of the commented
sfXArray, sfYArray for res_vec.
v for vector, s for scalar.

Quick test with that shows they all overlay as expected with those 2
resources.



Alan






On Thu, Oct 12, 2017 at 1:26 PM, Joe Grim <grim at ucar.edu> wrote:

> Hi,
>
> I am in the midst of creating a suite of operational weather plots for the
> ATEC project I am working on.  We are replacing RIP plots with NCL plots,
> since NCL is much more versatile.  I need the scripts to be as flexible as
> possible, since there are a wide variety of plots.  Therefore, I am drawing
> each layer of a plot and overlaying them.  For example, in the plot I am
> trying to create, there is a map, shaded contour plot, solid contour lines,
> dashed contour lines, and wind barbs.  It all plots perfectly, except for
> the wind barbs are missing.  I have tried to use numerous examples on the
> NCL website as templates, and then adapting them, but none of them will
> draw the wind barbs either.  I am trying to avoid using plotting functions
> that plot scalars and vectors within the same function, so the plotting
> system can be as flexible as possible.
>
> Here is my script.  The input file is on my website, here:
> http://joeandfrede.com/ncl/wrfout_d01_2017-09-23_12_00_00.RTC_P+FCST.
> Could someone tell me what I am missing or doing wrong?  Thanks on my part,
> and the whole ATEC project.
>
> Joe
>
> ; This script is used to test ideas for plotting in NCL
> load "$NCARG_ROOT/lib/ncarg/nclscripts/csm/gsn_code.ncl"
> load "$NCARG_ROOT/lib/ncarg/nclscripts/wrf/WRFUserARW.ncl"
> load "$NCARG_ROOT/lib/ncarg/nclscripts/csm/gsn_csm.ncl"
> begin
>  PlotType = "png"
>  in_file = "wrfout_d01_2017-09-23_12:00:00.RTC_P+FCST"
>  ncdf_in = addfile(in_file+".nc","r")
>  times  = wrf_user_list_times(ncdf_in)  ; get times in the file
>  ntimes = dimsizes(times)         ; number of times in the file
>  T2    = wrf_user_getvar(ncdf_in,"T2",0)
>  rh2   = wrf_user_getvar(ncdf_in,"rh2",0)
>  XLAT  = wrf_user_getvar(ncdf_in,"XLAT",0)
>  XLONG = wrf_user_getvar(ncdf_in,"XLONG",0)
>  U10   = wrf_user_getvar(ncdf_in,"U10",0)
>  V10   = wrf_user_getvar(ncdf_in,"V10",0)
>  slp   = wrf_user_getvar(ncdf_in,"slp",0)
>  dims       = dimsizes(XLAT)
>  nlat       = dims(0)
>  nlon       = dims(1)
>
> ; Create plot
>  PlotName = "T2_RH2_WND10_v2"
>  wks = gsn_open_wks(PlotType,PlotName)
>  gsn_define_colormap(wks,"BlAqGrYeOrReVi200")
>
>  res_sha = True
>  res_sha at cnFillOn = True
>  res_sha at gsnDraw    = False
>  res_sha at gsnFrame   = False
>  res_sha at gsnSpreadColors = True
>  res_sha at cnInfoLabelOn = False
>  res_sha at sfXArray  = XLONG
>  res_sha at sfYArray  = XLAT
>
>  res_con = True
>  res_con at cnLineColor = "NavyBlue"
>  res_con at cnLineThicknessF = 3
>  res_con at gsnDraw    = False
>  res_con at gsnFrame   = False
>  res_con at cnInfoLabelOn = False
>  res_con at gsnLeftStringOrthogonalPosF = 0.05
>  res_con at gsnRightStringOrthogonalPosF = 0.05
>  res_con at sfXArray  = XLONG
>  res_con at sfYArray  = XLAT
>
>  res_dash = True
>  res_dash at cnLineColor = "red4"
>  res_dash at cnLineThicknessF = 3
>  res_dash at gsnContourPosLineDashPattern = 1
>  res_dash at gsnDraw    = False
>  res_dash at gsnFrame   = False
>  res_dash at cnInfoLabelOn = False
>  res_dash at gsnLeftStringOrthogonalPosF = 0.1
>  res_dash at gsnRightStringOrthogonalPosF = 0.1
>  res_dash at sfXArray  = XLONG
>  res_dash at sfYArray  = XLAT
>
>  res_vec = True
>  res_vec at gsnDraw    = False
>  res_vec at gsnFrame   = False
>  res_vec at vcGlyphStyle    = "WindBarb"
>  res_vec at vcMinDistanceF  = 0.02
>  res_vec at vcRefLengthF  = 0.02
>  res_vec at gsnLeftStringOrthogonalPosF = 0.15
>  res_vec at gsnRightStringOrthogonalPosF = 0.15
>  res_vec at vcRefAnnoOn      = False
>  res_vec at vcMinFracLengthF = 0.2
>  ;res_vec at vcVectorDrawOrder        = "Postdraw"
>  ;res_vec at sfXArray  = XLONG
>  ;res_vec at sfYArray  = XLAT
>
>  res_map = True
>  res_map at gsnDraw    = False
>  res_map at gsnFrame   = False
>  res_map at mpLimitMode         = "Corners"             ; corner method of
> zoom
>  res_map at mpLeftCornerLatF    = XLAT(0,0)            ; left corner
>  res_map at mpLeftCornerLonF    = XLONG(0,0)            ; left corner
>  res_map at mpRightCornerLatF   = XLAT(nlat-1,nlon-1)  ; right corner
>  res_map at mpRightCornerLonF   = XLONG(nlat-1,nlon-1)  ; right corner
>  res_map at mpProjection        = "LambertConformal"    ; choose projection
>  res_map at mpLambertParallel1F = ncdf_in at TRUELAT1
>  res_map at mpLambertParallel2F = ncdf_in at TRUELAT2
>  res_map at mpLambertMeridianF  = ncdf_in at STAND_LON
>  res_map at tfDoNDCOverlay      = True                  ; native grid, no
> transform
>  ;res_map at mpOutlineDrawOrder     = "Predraw"
>  ;res_map at mpFillDrawOrder        = "Predraw"
>  res_map at mpFillOn            = False
>
>  plot_sha = gsn_csm_contour(wks,T2,res_sha)
>  plot_con = gsn_csm_contour(wks,rh2,res_con)
>  plot_dash = gsn_csm_contour(wks,slp,res_dash)
>  plot_vec = gsn_csm_vector(wks,U10,V10,res_vec)
>  plot_map = gsn_csm_map(wks,res_map)
>   ;res_map = res_vec
>   ;plot_map = gsn_csm_vector_map(wks,U10,V10,res_map)
>
>  overlay(plot_map,plot_sha)
>  overlay(plot_map,plot_con)
>  overlay(plot_map,plot_dash)
>  overlay(plot_map,plot_vec)
>
>  draw(plot_map)
>  frame(wks)
>
>  print("Created plot: "+PlotName+"."+PlotType)
>
> _______________________________________________
> ncl-talk mailing list
> ncl-talk at ucar.edu
> List instructions, subscriber options, unsubscribe:
> http://mailman.ucar.edu/mailman/listinfo/ncl-talk
>
>
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://mailman.ucar.edu/pipermail/ncl-talk/attachments/20171012/61975de3/attachment.html>