source: trunk/src/interp_erai_lwr_1989_2009.pro @ 70

;+
;
; .. _interp_erai_lwr_1989_2009.pro:
;
; =============================
; interp_erai_lwr_1989_2009.pro
; =============================
;
; DESCRIPTION
; ===========
;
; Interpolation of str from ERA-I grid to OAFLUX grid
;
; :file:`${PROJECT_ID}/20c3m_erai_str_TROP_1989_2009.nc` containing str from ERA-I have been produced
; by :ref:`compute_erai_daily_region_2d.sh`.
;
; :file:`${PROJECT_ID}/mask_oaflux_30N30S.nc` containing OAFLUX grid have been produced by :ref:`oaflux_mask_30N30S.pro`.
;
; Interpolated str is written in
; :file:`${PROJECT_OD}/erai_lwr_19890101_20091231_oafluxgrid.nc` if this file not already exists.
;
; This output file :file:`${PROJECT_OD}/erai_lwr_19890101_20091231_oafluxgrid.nc` must be processed after by :ref:`lwr_correction_ncdf.pro`.
;
;     .. graphviz::
;
;        digraph interp_erai_lwr_1989_2009 {
;           graph [
;           rankdir="LR",
;           ]
;           mask [shape=ellipse,fontname=Courier,label="${PROJECT_ID}/mask_oaflux_30N30S.nc"];
;
;           file_in [shape=ellipse,fontname=Courier,label="${PROJECT_ID}/20c3m_erai_str_TROP_1989_2009.nc"];
;
;           ncfile [shape=ellipse,fontname=Courier,label="${PROJECT_OD}/erai_lwr_19890102_20091231_oafluxgrid.nc"];
;
;           interp_erai_lwr_1989_2009 [shape=box,
;           fontname=Courier,
;           color=blue,
;           URL="http://forge.ipsl.jussieu.fr/tropflux/browser/trunk/src/interp_erai_lwr_1989_2009.pro",
;           label="${PROJECT}/src/interp_erai_lwr_1989_2009.pro"];
;
;           {mask file_in} -> {interp_erai_lwr_1989_2009} -> {ncfile}
;
;         }
;
; SEE ALSO
; ========
;
; :ref:`project_profile.sh`
;
; :func:`report <saxo:report>`
; :func:`isadirectory <saxo:isadirectory>`
; :func:`isafile <saxo:isafile>`
; :func:`initncdf <saxo:initncdf>`
; :func:`read_ncdf <saxo:read_ncdf>`
; :func:`domdef <saxo:domdef>`
; :func:`call_interp2d <saxo:call_interp2d>`
; :func:`ncdf_quickwrite <saxo:ncdf_quickwrite>`
;
; :ref:`lwr_correction_ncdf.pro`
;
; EXAMPLES
; ========
;
; ::
;
;  IDL> .compile file_interp
;  IDL> interp_erai_lwr_1989_2009
;
; TODO
; ====
;
; make it work : pb on loholt1::
;
;   Variable is undefined: OUTMASK_IND.
;
; check OUTMASK_IND and SET_OUTMSKVAL added to call_interp2d call
;
; use real output of :ref:`compute_erai_daily_region_2d.sh`.
;
; 19890101 is not provided in ERA-Intermim file str : a possible workaround is to copy 19890102
; dataset to 19890101 using nco before processing. see :ref:`compute_erai_daily_region_2d.sh`
;
; coding rules
;
; KNOWN ISSUES
; ============
;
; test of existence of fullfilename_msk not very efficient because
; MUST_EXIST keyword of :func:`isafile <saxo:isafile>` not yet implemented
;
; EVOLUTIONS
; ==========
;
; $Id$
;
; $URL$
;
; - fplod 20110808T094156Z cratos (Linux)
;
;   * add OUTMASK_IND and SET_OUTMSKVAL to call_interp2d call
;   * fix typo
;     .. note::
;
;        IDL do not warn when asking size of an undefined array::
;
;           IDL> must_crash=size(ginette)
;
; - pinsard 2011-07-05T07:33:36Z loholt1.ipsl.polytechnique.fr (Linux)
;
;   * usage of $PROJECT_ID and $PROJECT_OD
;
; - fplod 20101217T140745Z aedon.locean-ipsl.upmc.fr (Darwin)
;
;   * remove hard coded directory for mask_oaflux_30N30S.nc
;
; - fplod 20101215T094137Z aedon.locean-ipsl.upmc.fr (Darwin)
;
;   * add graph in header
;
; - fplod 20101214T093615Z aedon.locean-ipsl.upmc.fr (Darwin)
;
;   * minimal header
;
; - pbk 2008
;
;   * creation
;
;-
pro interp_erai_lwr_1989_2009
;
@cm_4cal
@cm_4data
@cm_4mesh
@cm_4data
@cm_project
;
; check for input directory
;
; test if ${PROJECT_ID} defined
CASE project_id_env OF
    ''  :  BEGIN
     msg = 'eee : ${PROJECT_ID} is not defined'
     ras = report(msg)
     STOP
           END
 ELSE: BEGIN
     msg = 'iii : ${PROJECT_ID} is ' + project_id_env
     ras = report(msg)
       END
ENDCASE
;
iodirin = isadirectory(project_id_env)
;
; existence and protection of ${PROJECT_ID}
IF (FILE_TEST(iodirin, /DIRECTORY, /EXECUTABLE, /READ) EQ 0) THEN BEGIN
   msg = 'eee : the directory' + iodirin  + ' is not accessible.'
   ras = report(msg)
   STOP
ENDIF
;
; build mask filename
filename_msk='mask_oaflux_30N30S.nc'
;
; check if this file exists
fullfilename_msk = isafile(iodirin + filename_msk, NEW=0, /MUST_EXIST)
IF fullfilename_msk[0] EQ '' THEN BEGIN
   msg = 'eee : the file ' + fullfilename_msk + ' was not found.'
   ras = report(msg)
   STOP
ENDIF

st=19890101 & en=20090801

; build data filename
filename='20c3m_erai_str_TROP_1989_2009.nc'
;
; check if this file exists
fullfilename = isafile(iodirin + filename, NEW=0, /MUST_EXIST)
IF fullfilename_msk[0] EQ '' THEN BEGIN
   msg = 'eee : the file ' + fullfilename_msk + ' was not found.'
   ras = report(msg)
   STOP
ENDIF
;
; test if ${PROJECT_OD} defined
CASE project_od_env OF
  '' : BEGIN
         msg = 'eee : ${PROJECT_OD} is not defined'
         ras = report(msg)
       STOP
       END
  ELSE: BEGIN
          msg = 'iii : ${PROJECT_OD} is ' + project_od_env
          ras = report(msg)
        END
 ENDCASE
;
; check if output data will be possible
iodirout = isadirectory(project_od_env)
;
; existence and protection
IF (FILE_TEST(iodirout, /DIRECTORY, /WRITE) EQ 0) THEN BEGIN
    msg = 'eee : the directory' + iodirout  + ' was not found.'
    ras = report(msg)
    STOP
ENDIF
;
; build output filename
filename_out = 'erai_lwr_19890101_20091231_oafluxgrid.nc'
fullfilename_out = iodirout + filename_out
; in order to avoid unexpected overwritten
IF (FILE_TEST(fullfilename_out) EQ 1) THEN BEGIN
   msg = 'eee : the file ' + fullfilename_out  + ' already exists.'
   ras = report(msg)
   STOP
ENDIF
;
initncdf, fullfilename
lwrin=read_ncdf("str",0,7668,/timestep,file=fullfilename,/nostr)
lwrin=-1*lwrin

initncdf, fullfilename
domdef
latin=reform(gphit(0,*)) & lonin=reform(glamt(*,0))
print, 'lat grid ',min(latin),max(latin),latin(1)-latin(0)
print, 'lon grid ',min(lonin),max(lonin),lonin(1)-lonin(0)

timein=time & jptin=jpt
tab=lwrin(*,*,0)
mskin=glamt*0.+1.

initncdf, fullfilename_msk
domdef
latout=reform(gphit(0,*)) & lonout=reform(glamt(*,0))
print, 'lat grid ',min(latout),max(latout),latout(1)-latout(0)
print, 'lon grid ',min(lonout),max(lonout),lonout(1)-lonout(0)
mskout=read_ncdf("msk", file=fullfilename_msk,/nostr)


si=size(lwrin)
lwrout=fltarr(jpi,jpj,jptin)

for jt=0,jptin-1 do begin
  print, 'Interpolation jt=',jt,' / ',jptin-1

  tab=reform(lwrin(*,*,jt))
  lwrout(*,*,jt)=call_interp2d(tab,lonin,latin,mskin $
     , lonout,latout,method='bilinear' $
     , OUTMASK_IND=mskout, SET_OUTMSKVAL=mskout)
  help, OUTMASK_IND
  help, SET_OUTMSKVAL
  lwrout(*,*,jt)=lwrout(*,*,jt)*mskout+(1.-mskout)*1.e20

endfor

time=timegen(7669, start=julday(1,2,1989,0), units='days') & jpt=n_elements(time)
tt=time & jptin=jpt
cda0=string(jul2date(tt(0)),format='(i8.8)')
cda1=string(jul2date(tt(jpt-1)),format='(i8.8)')
tt=tt-julday(1,1,1950,00,00,00)
xlon=reform(glamt(*,0) ) & ylat=reform(gphit(0,*))

initncdf, fullfilename_msk
valmask=1.e20

ylat=latout
xlon=lonout
ncfile='!' + fullfilename_out
lon_attr={units:'degrees_east',long_name:'Longitude'}
lat_attr={units:'degrees_north',long_name:'Latitude'}
time_attr={units:'days since 1950-01-01 00:00:00',long_name:'Time axis',time_origin:' 1950-JAN-01 00:00:00'}

lwr_attr={units:'W/m2',missing_value:valmask,long_name:'Surface net longwave radiation ',short_name:'lwr',axis:'TYX'}
time_attr={units:'days since 1950-01-01 00:00:00',long_name:'Time axis',time_origin:' 1950-JAN-01 00:00:00'}
globattr={source:'Tropical ocean fluxes obtained from ERA Interim',timerange:cda0+' - '+cda1}

ncfields = 'lwr[longitude,latitude,time]=lwrout:lwr_attr; ' $
                      + 'longitude[]=xlon:lon_attr; ' $
                      + 'latitude[]=ylat:lat_attr; ' $
                      + 'tt[*time]=tt:time_attr ' $
                      + ' @ globattr'

@ncdf_quickwrite

return
end