I want to process multiple netcdf output files quickly. At the moment
my code is set up to read in only one file, and when I want a different
file I have to edit it into the NCL code.I want to quickly process
multiple files at different times. An example of the was the code
currently reads in a file is included below. I actually want to
calculate the relative angular momentum for each file, rather than plot
each file. When I have the relative angular momentum for each plot I
them want to plot how that changes over time, where each of the files I
read in is output from the different times.
Can you tell me how to do this ?.
Thanks,
Helen.
load "$NCARG_ROOT/lib/ncarg/nclscripts/csm/contributed.ncl"
begin
; input file
diri = "./"
fili = "eddy2a.cam2.h0.0003-05-19-00000.nc"
fi = addfile (diri+fili, "r")
; output file
diro = "./"
filo = "helen.nc"
system ("/bin/rm -f "+diro+filo) ; remove any pre-exist file
fo = addfile (diro+filo, "c")
; add any file attributes
fo_at_title = fi_at_title + ": Selected Variables at pressure levels"
fo_at_history = systemfunc ("date")
fo_at_source = fi_at_source
fo_at_case = fi_at_case
fo_at_Conventions = fi_at_Conventions
Var = (/ "T" , "Q", "U", "V"/) ; select variable to be
interpolated.
nVar = dimsizes (Var)
; desired output levels
lev_p = (/ 91500., 90000., 87500., 80000., 67500., 50000., 30000.,
20000., 100
00., 5000., 3000., 1500., 750., 390., 200., 100., 50.,25., 14., 7.,
3.5, 1.9, 0.
95, 0.4, 0.1, 0.01 /)
lev_p!0 = "lev_p" ; variable and dimension name
the same
lev_p&lev_p = lev_p ; create coordinate variable
lev_p_at_long_name = "pressure" ; attach some attributes
lev_p_at_units = "hPa"
lev_p_at_positive = "down"
hyam = fi->hyam ; read hybrid info
hybm = fi->hybm
PS = fi->PS
P0mb = 0.01*fi->P0
do n=0,nVar-1 ; loop over the variables
X = fi->$Var(n)$
Xp = vinth2p (X, hyam, hybm, lev_p ,PS, 1, P0mb, 2, True)
copy_VarAtts(X, Xp)
fo->$Var(n)$ = Xp ; write to netCDF file
print (Var(n)+": interpolated and written to netCDF")
end do
end
;***********************
; zonal.ncl
;***********************
load "$NCARG_ROOT/lib/ncarg/nclscripts/csm/gsn_code.ncl"
load "$NCARG_ROOT/lib/ncarg/nclscripts/csm/gsn_csm.ncl"
;***********************
begin
f = addfile ("helen.nc","r")
print(f)
u = f->U
printVarSummary( u )
dimu = dimsizes( u )
ntim = dimu(0)
klvl = dimu(1)
nlon = dimu(2)
mlon = dimu(3)
;***********************
; Create Plot
;***********************
wks = gsn_open_wks ("pdf", "eddy2a" ) ; open workstation
gsn_define_colormap(wks,"rainbow") ; choose colormap
res = True
res_at_cnFillOn = True
res_at_lbLabelAutoStride = True
res_at_gsnMaximize = True ; if [ps, eps, pdf] make large
res_at_gsnSpreadColors = True ; span color map
do nt=0,ntim-1
res_at_gsnCenterString = "eddy2a"
plot = gsn_csm_pres_hgt(wks, u(nt,:,:,0), res ) ; (lev,lat)
res_at_trYReverse = True
; plot = gsn_csm_contour (wks, u(nt,:,:,0), res ) ; (lev,lat)
; plot = gsn_csm_contour (wks, u(nt,:,0,:), res ) ; (lev,lon)
kl = 5
res_at_mpFillOn = False
res_at_mpGridAndLimbOn = True
res_at_mpGridLineDashPattern = 2
res_at_mpOutlineBoundarySets = "NoBoundaries"
res_at_mpCenterLonF = 180.
res_at_gsnCenterString = res_at_gsnCenterString+" p="+u&lev_p(kl)
; plot = gsn_csm_contour_map_ce (wks, u(nt,kl,:,:), res )
end do
end
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Received on Wed Nov 19 2008 - 16:02:28 MST
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