Re: Y-Axis Label Problem On WRF Cross Section

From: Mary Haley <haley_at_nyahnyahspammersnyahnyah>
Date: Wed Dec 04 2013 - 17:13:34 MST

Hi Mike,

When you use wrf_overlays to overlay a bunch of plots on top of each other, it simply takes all the plots you create, lines up the four corners, and draws them. It also removes all the tickmarks and tickmark labels for all but the very first plot, so you don't get a bunch of clutter.

This means that if you use trYMaxF to change the Y axis for one of the plots, you need to change it similarly for all plots in the wrf_overlays call, otherwise you will be lining up plots that don't have the same Y axis.

Let us know if this doesn't fix the problem.

--Mary

On Dec 2, 2013, at 11:48 PM, Mike Pirhalla <glacierbayncl@gmail.com> wrote:

> Hi NCL Community,
> I have a working cross section of PM data, wind, and temperature. However, Iíd like to cut off the graph at 3km in height and below. When I do this by putting in a value at opts@trYMaxF, the Yaxis labels get messed up, and I think itís inaccurately labeling the y-axis because the terrain height and other contours donít match as the once did. Iíd also like the make the tickmarks more prevalent on the y-axis. Attached is my code and the plots, one with a cut off yaxis at opts@trYMaxF=24 (? Was experimenting with values) and other with the entire WRF column. Any help is appreciated, thanks!
>
> Michael Pirhalla
> Graduate Research Assistant
> University of Alaska Fairbanks
>
> <image005.jpg><image006.jpg>
>
> ;--------------------------------------------------------------------------
> load "$NCARG_ROOT/lib/ncarg/nclscripts/csm/gsn_code.ncl"
> load "$NCARG_ROOT/lib/ncarg/nclscripts/wrf/WRFUserARW.ncl"
> load "$NCARG_ROOT/lib/ncarg/nclscripts/csm/gsn_csm.ncl"
> load "$NCARG_ROOT/lib/ncarg/nclscripts/csm/contributed.ncl"
> load "$NCARG_ROOT/lib/ncarg/nclscripts/csm/shea_util.ncl"
> load "$NCARG_ROOT/lib/ncarg/nclscripts/contrib/ut_string.ncl"
> ;load "color_map.ncl"
> ;---------------------------------------------------------------------------
>
> begin
> ;What type of plot do we want?
> type = "x11"
> ;type = "ps"
> ;type = "pdf"
>
> wks = gsn_open_wks(type,"WRF_PM_Cross_Section")
> gsn_define_colormap(wks,"BlAqGrYeOrReVi200")
>
> ;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
> ; READ WRF OUTPUT FILE AND INCLUDE ALL CASES
>
> ; all_files = systemfunc ("ls /center/d/molders/WITH/wrfout_d01_200*")+".nc"
> ; print(all_files)
> ; a = addfiles(all_files,"r")
> ; print(a)
> ; ListSetType (a, "cat") ; Combine all files
> ; idim=dimsizes(all_files)
>
> a = addfile("/center/d/molders/WITH/wrfout_d01_2008-07-19_00:00:00"+".nc","r")
>
> ;---------------------------------------------------------------------------
> FirstTime = True
> times = wrf_user_getvar(a,"times",-1) ; get times in the file
> ntimes = dimsizes(times) ; number of times in the file
> print("ntimes"+ntimes)
> ;----------------------------------------------------------------------------
> ; Set some basic resources
> res = True
> res@MainTitle = "REAL-TIME WRF" ; main title of plot
> res@Footer = True ; footer information
>
> pltres = True
> ;-----------------------------------------------------------------------------
> ; HOURLY LOOP OF PARTICULATE MATTER
>
> do it = 0,ntimes-1 ; loop over all hours
> ;do it=11,11 ; choose specific hour
>
> print("Working on time: " + times(it) )
> res@TimeLabel = times(it) ; Set Valid time to use on plots
>
> ; First get the variables we will need
> tc = wrf_user_getvar(a,"tc",it) ; T in C
> z = wrf_user_getvar(a,"z",it) ; grid point height
> hgt = wrf_user_getvar(a,"HGT",it)
>
> if(FirstTime) then ; get height for labels
> zmin = 0.
> zmax = max(z) / 1000 ; make to km
> nz = floattoint(zmax/2 + 1)
> FirstTime = False
> end if
> ;z_values=fspan(zmin,zmax,100)
> ;print(z_values)
> ;exit
>
> ; Get PM10 data from WRF/Chem
> pm = a->PM10(it,:,:,:)
> pm@description = "PM~B~10~N~ Concentration"
> pm@units = "~F33~m~F21~g/m~S~3~N~"
>
> ; Get the wind data
> uu=wrf_user_getvar(a,"ua",it) ; u component of wind on mass points
> vv=wrf_user_getvar(a,"va",it) ; v component of wind on mass points
>
> ;uu = a->U10(it,:,:) ; u wind component at 10m
> ;vv = a->V10(it,:,:) ; v wind component at 10m
>
> ;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
> ;maxlat=59.1125
> ;maxlon=-137.228
> ;minlat=58.3728
> ;minlon=-135.739
> ;lats =(/maxlat,minlat/)
> ;lons = (/maxlon,minlon/)
> ; loc = wrf_user_latlon_to_ij(a,lats,lons)
> ; ys = loc(0,0) ; Starting y (j) location
> ; ye = loc(1,0) ; Ending y (j) location
> ; xs = loc(0,1) ; Starting x (i) location
> ; xe = loc(1,1) ; Ending x (i) location
>
> do ip = 3,3 ; we are doing 3 plots, specifying different start and end points
> opts = True ; setting start and end times/points
> plane = new(4,float)
>
> if(ip .eq. 1) then
> plane = (/51,42, 52,62/) ; start x;y & end x;y point (X-sec top left diagonal)
> ;The values should be ordered as (xstart,xend,ystart,yend). ; plane = (/xs,ys, xe,ye/)
> end if
> if(ip .eq. 2) then
> plane = (/48,49, 50,66/) ; start x;y & end x;y point (X-sec top right diagonal)
> end if
> if(ip .eq. 3) then
> plane = (/43,55, 57,57/)
> end if
>
> ; Interpolate WRF Model data vertically
> angle = 0.
>
> ; Establish starting and end points in domain
> ; plane = new(4,float)
> ; plane = (/ xs,ys, xe,ye /) ; start x;y & end x;y point
> pm_plane = wrf_user_intrp3d(pm,z,"v",plane,angle,opts) ; "v" vertical cross section
> tc_plane = wrf_user_intrp3d(tc,z,"v",plane,angle,opts)
> u_plane = wrf_user_intrp3d(uu,z,"v",plane,angle,opts)
> v_plane = wrf_user_intrp3d(vv,z,"v",plane,angle,opts)
>
> u_plane=u_plane*1.94386 ; convert to kts
> v_plane=v_plane*1.94386
> u_plane@units = "kts"
> v_plane@units = "kts"
>
> xcoord = ispan(0,dimsizes(pm_plane(0,:)), 1) ;takes the size of the plane (in this case 12 grid points)
> dim = dimsizes(pm_plane) ; find the data span for use in labels
> zspan = dim(0)
>
> ; Plotting Options for PM
> opts_xy = res
> opts_xy@tiYAxisString = "Altitude (km)"
> opts_xy@tiXAxisString = "Cross Section Distance (km)"
> opts_xy@tiXAxisFontHeightF = 0.015
> opts_xy@tiYAxisOn = True
> opts_xy@tmXBMode = "Explicit" ;turn manual X axis labels on
> opts_xy@tmXBValues = xcoord ;labels the start to end grid points as stated above
> opts_xy@tmXBLabels = xcoord*7 ;take values and mult by 7 since grid cells are 7km width
> opts_xy@tmXBLabelFontHeightF = 0.01
> opts_xy@tmXTOn = False ;turns off top plot tickmarks
> opts_xy@tmYROn = False ;turns off right tickmarks
> opts_xy@gsnMaximize = True ;Plot maximized in workstation
>
> ; yxis options for Height/PM
> opts_xy@tmYLMode = "Explicit"
> opts_xy@tmYLValues = fspan(0,zspan,nz)
> opts_xy@tmYLLabels = sprintf("%.1f",fspan(zmin,zmax,nz))
> ; opts_xy@trYMaxF = 24 ; not sure how this works?
> ; Specifies a minimum Y coordinate value that defines the lower bound of the Y-Axis coordinate system.
>
> ; PM10 Plotting Commands
> opts_xy@cnFillOn = True ;Fill in the PM Contours
> opts_xy@cnFillMode = "AreaFill" ; Smooth them
> opts_xy@cnLinesOn = False ; turn off PM contour lines
> opts_xy@cnLineLabelsOn = False ; turn off PM contour labels
>
> ;options for size of plot dimensions
> opts_xy@vpXF = 0.105 ; left edge of the view objects bounding box
> opts_xy@vpWidthF=0.75 ; width of the viewing box
> opts_xy@vpYF = 0.84355 ; top edge location
> opts_xy@vpHeightF = 0.51 ; height of the viewing box
>
> ;--Temperature lotting Options
> opts_tc = res
> opts_tc@cnInfoLabelOn = False ; turn off contour label
> opts_tc@ContourParameters = (/ 2. /) ; label temp every 5 degrees
> opts_tc@cnLineLabelInterval = 1 ; every contour labeled
> opts_tc@cnLineLabelDensityF = .5 ; only one label per contour line
> ; opts_tc@gsnMaximize = True
> ; opts_tc@tiXAxisOn = False
>
> ;options for size of plot dimensions NECESSARY
> opts_tc@vpXF = 0.105
> opts_tc@vpWidthF=.75
> opts_tc@vpYF = 0.84355
> opts_tc@vpHeightF = 0.51
>
> ;Same Y Plotting options to restrict data to certain level
> opts_tc@tmYLMode = "Explicit"
> opts_tc@tmYLValues = fspan(0,zspan,nz)
> opts_tc@tmYLLabels = sprintf("%.1f",fspan(zmin,zmax,nz))
> ; opts_tc@trYMaxF = 24 ; cut off plot at this level?
>
>
>
> ;---Wind Plotting Options
> opts_w=res
> opts_w@FieldTitle = "Wind Speed" ; Overwrite Field Title
> opts_w@vcMinDistanceF = 0.05 ; thin out windbarbs
> opts_w@NumVectors = 20 ; Wind barb density
> opts_w@gsnMaximize = True
>
> ;options for size of plot dimensions NECESSARY
> opts_w@vpXF = 0.105
> opts_w@vpWidthF=.75
> opts_w@vpYF = 0.84355
> opts_w@vpHeightF = 0.51
>
> ;Same Y Plotting options to restrict data to certain level
> opts_w@tmYLMode = "Explicit"
> opts_w@tmYLValues = fspan(0,zspan,35)
> opts_w@tmYLLabels = sprintf("%.1f",fspan(zmin,zmax,35))
> ; opts_w@trYMaxF = 24 ; cut off plot at this level?
>
> ; Contour information for PM, Temp, Wind
> contour_pm = wrf_contour(a,wks,pm_plane,opts_xy)
> contour_tc = wrf_contour(a,wks,tc_plane,opts_tc)
> vector=wrf_vector(a,wks,u_plane,v_plane,opts_w)
>
> ; RESOURCES FOR FINAL OVERLAY PLOT
> pltres@gsnMaximize = True
> pltres@vpXF = 0.105
> pltres@vpWidthF=0.75
> pltres@vpYF = 0.84355
> pltres@vpHeightF = 0.51
>
> ; Plot the graph
> plot = wrf_overlays(a,wks,(/contour_pm,contour_tc,vector/),pltres)
>
> ; delete option fields to avoid carry over
> delete(opts_tc)
> delete(opts_xy)
> delete(tc_plane)
> delete(pm_plane)
>
> end do ; make the next cross section
> ;-----------------------------------------
> end do ; end of time loop
> ;----------------------------------------
> end
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Received on Wed Dec 4 17:13:46 2013

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