Hello all,
I am novice in NCL and I have some questions.
Firstly, I work on NCL version 6.0.0-beta
I handle with wind data .nc files (ws(time, height, lat, lon)).
I would like to plot the wind fields but for a specific time period and
area.
I tried to achieve it making the attached script.
The dim_avg function as well as the dimensions re-ordering of my variable
has been already done, but I have faced up a serious problem plotting the
wind field.
When I run the script the following error messages has been displayed on my
screen:
"(0) gsn_csm_contour_map_ce: Fatal: the input data must be 1D or 2D"
"Fatal: Illegal right-hand side type for assignment"
"Fatal: Execute: Error occurred at or near line 158 in file"
Any help would be appreciated..
John
Attached script:
;*************************************************
; Time-Averaged and Plot wind speed fields
;*************************************************
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/csm/contributed.ncl"
begin
f1 = addfile("C4IRCA3_A2_ECHAM5_DM_25km_1991-2000_wss.nc","r")
time = f1->time
ws = f1->wss
lat2d = f1->lat
lon2d = f1->lon
pollat = 39.25
pollon = -162.0
time2 = ut_calendar(time, 0)
year = tointeger(time2(:,0)) ; Convert to integer for
month = tointeger(time2(:,1)) ; use sprinti
day = tointeger(time2(:,2))
beg_year = 2000
end_year = 2000
beg_month = 12
end_month = 12
beg_day = 29
end_day = 31
ibeg = day_of_year(beg_year,beg_month,beg_day)
iend = day_of_year(end_year,end_month,end_day)
;======================================================================
; Select the subregion (Mediterranean Area)
;======================================================================
latS = 30
latN = 46
lonW = -10
lonE = 41
ji = region_ind(lat2d,lon2d,latS,latN,lonW,lonE)
jStrt = ji(0)
jLast = ji(1)
iStrt = ji(2)
iLast = ji(3)
llat2d = lat2d(jStrt:jLast,iStrt:iLast)
llon2d = lon2d(jStrt:jLast,iStrt:iLast)
nlat = dimsizes(llat2d(:,iStrt))
nlon = dimsizes(llon2d(jStrt,:))
wsNew = ws(height|:,rlat|jStrt:jLast,rlon|iStrt:iLast,time|ibeg:iend)
wsAvg = dim_avg_Wrap(wsNew)
; wsm = f1->wss
;======================================================================
; Start graphic section
;======================================================================
wks = gsn_open_wks("png", "Aveg_C4IRCA3_Med_Sea_A2") ; make png image
gsn_define_colormap(wks,"BlAqGrYeOrRe") ; choose color map
res = True ; plot mods desired
res@gsnMaximize = True ; maxmize plot in frame
res@cnFillOn = True ; turn on color
res@gsnSpreadColors = True ; automatically choose the
fill colors
res@cnLinesOn = False ; no contour lines
res@cnLevelSpacingF = 0.2 ; contour spacing
res@cnLineLabelsOn = False ; no contour labels
; =====================================================================
; Create Map and Mask Land
; =====================================================================
res@mpDataBaseVersion = "MediumRes" ; use finer database
res@mpDataSetName = "Earth..4"
res@mpProjection = "CylindricalEquidistant"
res@mpOutlineBoundarySets = "National"
res@mpFillOn = True ; true for masking
res@mpGeophysicalLineThicknessF = 1.5
res@mpAreaMaskingOn = True ; masking land
res@mpMaskAreaSpecifiers = "Ocean"
res@mpLandFillColor = 0
res@mpFillDrawOrder = "PostDraw"
;=====================================================================
; Laber Bar
;=====================================================================
res@lbLabelAngleF = 0 ; angle labels
res@lbLabelFontHeightF =.001 ; make labels larger
res@lbTitleOn = True ; turn on title
res@lbTitleString = "Wind Speed in m/s"
res@lbTitleFontHeightF = .010 ; make title smaller
res@pmLabelBarOrthogonalPosF = .10 ; move whole thing down
res@cnInfoLabelOn = False ; turn off contour info
label
res@lbAutoManage = False ; we control label bar
res@pmLabelBarDisplayMode = "Always" ; turns on label bar
res@lbOrientation = "Horizontal" ; ncl default is vertical
res@pmLabelBarSide = "Bottom" ; default is right
res@lbLabelStride = 1 ; skip every other label
res@pmLabelBarWidthF = 0.4 ; default is shorter
res@pmLabelBarHeightF = 0.1 ; default is taller
res@lbLabelFontHeightF = .010 ; default is HUGE
res@lbPerimOn = False ; default has box
res@lbBoxLinesOn = False
res@pmTickMarkDisplayMode = "conditional"
res@gsnAddCyclic = False
; ====================================================================
; Set titles
; ====================================================================
res@gsnRightString = "A2 SRES (1991-2000)" ; write a text
up&right below title
res@gsnRightStringFontHeightF = .010 ; right title font size
res@gsnLeftStringFontHeightF = .015 ; left title font size
res@tiMainString = "C4IRCA3 driven by ECHAM5" ; set the main title
res@tiMainFontHeightF = .020 ; main title font size
; Setting tfDoNDCOverlay to True means you have specified the
; exact projection that your data is on, and thus no data
; transformation takes place when the contours are overlaid
; on the map.
;
res@tfDoNDCOverlay = True
; ====================================================================
; Zoom in on map
; ====================================================================
res@mpLimitMode = "Corners"
res@mpLeftCornerLatF = llat2d(0,0)
res@mpLeftCornerLonF = llon2d(0,0)
res@mpRightCornerLatF = llat2d(nlat-1,nlon-1)
res@mpRightCornerLonF = llon2d(nlat-1,nlon-1)
res@mpCenterLonF = 180.0 + pollon
res@mpCenterLatF = 90.0 - pollat
plot = gsn_csm_contour_map (wks,wsAvg,res) ; Draw plot
end
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