[ncl-talk] Regrinding WRF precipitation to TRMM grid

[Saurabh Singh]

Dear Mam/Sir

NCL 6.3.0
OS Ubuntu

I am trying to regard WRF precipitation data from curvilinear grid to
rectilinear grid ignorer to take its difference from TRMM data. i am using
the code :

a = addfile ("/Users/saurabh/Downloads/wrfout_d01_2000-01-24_12:00:00.nc
","r")
Rain = a->RAINC
rainfall = a->RAINC
printVarSummary(rainfall) ; look at the variable
printMinMax(rainfall, True ) ; contributed.ncl
rainfall!0 = "time"
rainfall!1 = "lat"
rainfall!2 = "lon"
printVarSummary(rainfall)
rearrange_rain = rainfall(time|:,lon|:,lat|:)
; reorder coordinates for next step
; Average all lats as a function of lon for Time vs. Longitude plot
;(Hovmueller diagram)
rain=dim_avg(rearrange_rain) ; avg rightmost dimension with center
dimension
copy_VarMeta(rearrange_rain, rain)
printVarSummary(rain)
printMinMax(rain)
;WRF XLAT/XLONG are (Time,south_north,west_east)
;Generally, they do not change with time.
;Hence, read then as 2D arrays
                          ; These are [*][*] (two dimensional)
 lat2d = a->XLAT(0,:,:)
 lon2d = a->XLONG(0,:,:)
 lat2d_at_units = "degrees_north" ; not required for interpolation
 lon2d_at_units = "degrees_east"
 printVarSummary(lat2d)
 printVarSummary(lon2d)
;Your 'target' (rectilinear) grid is lat[*],lon[*].
;This could be from some other model
;or you could manually create via
 latS = 5 ; regular grid output
 latN = 11
 lonL = -30
 lonR = -20
 mlon = 22 ; however many points you want, here 22
 ;because 0.5 degree
 lon = fspan (lonL, lonR, mlon)
 lon!0= "lon"
 lon_at_units = "degrees_east"
 print(mlon)
 nlat = 14 ; however many points you want
 lat = fspan (latS,latN, nlat)
 lat!0= "lat"
 lat_at_units = "degrees_north"
 print(nlat)
raingrd = rcm2rgrid(lat2d,lon2d,rain,lat,lon,0)
printVarSummary(ringed)

but the regrinding does not happen, i get the following error:



fatal:rcm2rgrid: The rightmost dimensions of fi must be nlat2d x nlon2d,
where nlat2d and nlon2d are the dimensions of the lat2d/lon2d arrays

fatal:["Execute.c":8575]:Execute: Error occurred at or near line 46 in file
regrid.ncl


fatal:Variable (raingrd) is undefined

fatal:["Execute.c":8575]:Execute: Error occurred at or near line 47 in file
regrid.ncl


Kindly help me to solve this problem.
-- 
With regards
Saurabh Kumar singh

 *P** : * *Please consider the environment before printing this e-mail*
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