[ncl-talk] hovmoller diagram and reshape function

[Ramchandra Karki]

Dear NCL users,I have hourly wrf arw output and plotted the hovmoller diagramme  along the cross section of two points  for july as monthly average of each hour (average value of 0 hour, 1 hour ........23 hour of each day) precipitation for whole month ( 24 values ).ploted hovmoller for  hourly time  vs cross section grid of two points.i have used reshape function however i am confused whether its producing right output or not.(use of reshape function for my purpose). (array as 24, number of days, ncross_section_points and averaging for days furthermore, I would like to convert the UTC time to local time (5:45 hour ahead of UTC) in my plot but could not get idea to do so.I look forward for getting feedback from you.my script
; This script is used to plot ; get each hour average value for 24 hours; get data along two point section; plot hovmoller for time vs grid along section 
load "$NCARG_ROOT/lib/ncarg/nclscripts/csm/gsn_code.ncl"load "$NCARG_ROOT/lib/ncarg/nclscripts/csm/gsn_csm.ncl"load "$NCARG_ROOT/lib/ncarg/nclscripts/wrf/WRF_contributed.ncl"load "$NCARG_ROOT/lib/ncarg/nclscripts/csm/contributed.ncl"load "$NCARG_ROOT/lib/ncarg/nclscripts/wrf/WRFUserARW.ncl"
begin; The WRF ARW input file.  ; This needs to have a ".nc" appended, so just do it. DATADir = "/geodata/data/private/fgvy024/Build_WRF/WRFV6/run/" FILES = systemfunc (" ls -1 " + DATADir + "wrfout_d03_2015-07*") ; contain hourly time stamp numFILES = dimsizes(FILES) a = addfiles(FILES+".nc","r")  type = "png"                ; map type wks = gsn_open_wks(type,"july_hovmoller_hourly_ppt")         ; Create a plot workstation rain_exp = wrf_user_getvar(a,"RAINNC",-1) rain_con = wrf_user_getvar(a,"RAINC",-1) rain = rain_exp + rain_con Remp = dimsizes(rain) nt = Remp(0) nnlat = Remp(1) nlon = Remp(2); get hourly rainfall  Ree = rain(1:nt-1,:,:) - rain(0:nt-2,:,:) ; to get hourly precipitation ; get new variable with full time step to make it multiplable by 24  Re = new((/nt, nnlat, nlon/),float)  Re(1:nt-1,:,:) = Ree(:,:, :)   Re(0, :, :) = 0 ; first array will have zero value  dims = dimsizes(Re)  pA_lon = 86.2233 ; longitude of point A  pA_lat = 27.88163333 ; lat of point A  pB_lon = 86.541725 ; similar for point B  pB_lat = 27.89950278    pointA = wrf_user_ll_to_ij(a, pA_lon, pA_lat, True) ; get array point    pointB = wrf_user_ll_to_ij(a, pB_lon, pB_lat, True)    xA = pointA(0) - 1    yA = pointA(1) - 1      xB = pointB(0) - 1    yB = pointB(1) - 1   opts = True   plane = new(4,float) ; for section along two points  plane = (/  yA,xA, yB,xB  /)
; interpolate value along the section of A and B R_plane = wrf_user_intrp2d(Re,plane,0.,opts) Re_dims = dimsizes(R_plane) ntim     = Re_dims(0) ncross     = Re_dims(1) ndays       = ntim/24 Re3d       = reshape(R_plane,(/24,ndays, ncross/)) ;  hours, days, crosssection copy_VarAtts(R_plane,Re3d) Re3d_hr_avg = dim_avg_n_Wrap(Re3d,1) ; hourly average (monthly, 0 hours average, 1 hour average, etc)  res                      = True               ; plot mods desired  res at cnFillOn             = True               ; turn on color fill  res at cnFillPalette        = "BlWhRe"           ; set color map  res at tiMainString         = "Hourly Precipitation"   ; title  res at cnLevelSelectionMode = "ManualLevels"     ; manual contour levels  res at cnMinLevelValF       = 0.	        ; min level  res at cnMaxLevelValF       =  2               ; max level  res at cnLevelSpacingF      = 0.1               ; contour level spacing  plot = gsn_csm_hov(wks, Re3d_hr_avg(:,:), res) end
RegardsRam 		 	   		   		 	   		  
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