;+
;
; .. _TropFlux_swr_DT_19890101_20071231.pro:
;
; =====================================
; TropFlux_swr_DT_19890101_20071231.pro
; =====================================
;
; DESCRIPTION
; ===========
;
; Correction of swr delay time on OAFLUX grid
;
; :file:`${PROJECT_OD}/swr_oafluxgrid_1985_2007.nc`
; have been produced ++by pk
;
; Corrected swr delay on OAFLUX grid 
; is written in
; :file:`${PROJECT_OD}/TropFlux_swr_19890101_20071231_DT.nc`
; if this file not already exists.
;
; This file will be used by :ref:`TropFlux_swr_BLND_19890101_20091231.pro`.
;
;     .. graphviz::
;
;        digraph tropflux_swr_dt_19890101_20071231 {
;
;           file_in [shape=ellipse,fontname=Courier,label="${PROJECT_OD}/swr_oafluxgrid_1985_2007.nc"];
;           file_out [shape=ellipse,fontname=Courier,label="${PROJECT_OD}/TropFlux_swr_19890101_20071231_DT.nc"];
;
;           tropflux_swr_dt_19890101_20071231 [shape=box,
;           fontname=Courier,
;           color=blue,
;           URL="http://forge.ipsl.jussieu.fr/tropflux/browser/trunk/src/TropFlux_swr_DT_19890101_20071231.pro",
;           label="${PROJECT}/src/TropFlux_swr_DT_19890101_20071231.pro"];
;
;           {file_in}-> {tropflux_swr_dt_19890101_20071231} -> {file_out}
;
;        }
;
; SEE ALSO
; ========
;
; :ref:`project_profile.sh`
;
; :ref:`mooring_corrections`
;
; :ref:`data_in_swr`
;
; :func:`initncdf <saxo:initncdf>`
; :func:`read_ncdf <saxo:read_ncdf>`
; :func:`grossemoyenne <saxo:grossemoyenne>`
; :func:`julday <saxo:julday>`
; :func:`caldat <saxo:caldat>`
; :func:`ncdf_quickwrite <saxo:ncdf_quickwrite>`
;
; EXAMPLES
; ========
;
; ::
;
;  IDL> .compile TropFlux_swr_DT_19890101_20071231
;  IDL> tropflux_swr_dt_19890101_20071231
;
; TODO
; ====
;
; NaNf values in ouptut file while 1.e20 in input file !!
;
; coding rules
;
; why compile is needed ? uppercase in file name
;
; any way change the name to swr_dt_correction_ndcf.pro
; to homogenize names of tools
;
; use the output of concat_swr.sh to be written.
; now use swr_oafluxgrid_1985_2007.nc provided by pk 20110811
;
; KNOWN ISSUES
; ============
;
; test of existence of fullfilename not very efficient because
; MUST_EXIST keyword of :func:`isafile <saxo:isafile>` not yet implemented
;
; EVOLUTIONS
; ==========
;
; $Id$
;
; $URL$
;
; - fplod 20110812T073138Z aedon.locean-ipsl.upmc.fr (Darwin)
;
;   * usage of ${PROJECT_OD}
;   * complete description
;   * remove v50 in output filename
;
; - fplod 20101215T091726Z aedon.locean-ipsl.upmc.fr (Darwin)
;
;   * add graph in header
;
; - fplod 20101214T093615Z aedon.locean-ipsl.upmc.fr (Darwin)
;
;   * minimal header
;
; - pbk 2008
;
;   * creation
;
;-
pro TropFlux_swr_DT_19890101_20071231
;
@cm_4cal
@cm_4data
@cm_4mesh
@cm_4data
@cm_project
;
; 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 for reading
IF (FILE_TEST(iodirout, /DIRECTORY, /EXECUTABLE, /READ) EQ 0) THEN BEGIN
   msg = 'eee : the directory' + iodirout  + ' is not accessible.'
   ras = report(msg)
   STOP
ENDIF
;
; existence and protection for writing
IF (FILE_TEST(iodirout, /DIRECTORY, /WRITE) EQ 0) THEN BEGIN
    msg = 'eee : the directory' + iodirout  + ' was not found.'
    ras = report(msg)
    STOP
ENDIF
;
; build data filename
filename='swr_oafluxgrid_1985_2007.nc'
;
; check if this file exists
msg='iii : looking for ' + filename
ras = report(msg)
fullfilename = isafile(iodirout + filename, NEW=0, /MUST_EXIST)
IF fullfilename[0] EQ '' THEN BEGIN
   msg = 'eee : the file ' + fullfilename + ' was not found.'
   ras = report(msg)
   STOP
ENDIF
;
; build output filename
filename_out = 'TropFlux_swr_19890101_20071231_DT.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, filename

sw=read_ncdf("swr", 19890101, 20071231, file=filename,/nostr)
help, sw

sw_mean=grossemoyenne(sw, 't',/nan)
help, sw_mean

tt=time & jpt=n_elements(time)
caldat, time,mon,day,yea
sw_m=sw*0. &  sw_bias=sw*0.

for jt=0,jpt-1 do begin
  jtt=(time(jt)-julday(1,1,yea(jt))) < 364
  swr=reform(sw_mean(*,*))
  sw_m(*,*,jt)=swr
  sw_bias(*,*,jt)=(((swr-295.4)*18.36/(200.-295.4)) > 0.) < 18.37
endfor

help, sw_m, sw_bias
swa=sw-sw_m
swa=swa/(0.901273)       ;; variability correction (seasonal_cycle_swr_isccp.pro)

swr=sw_m+swa-sw_bias       ;; new swr, corrected for bias and variability
;writing field
;time=julday(1,1,1989)+lindgen(7670)
cda0=string(jul2date(tt(0)),format='(i8.8)')
cda1=string(jul2date(tt(jpt-1)),format='(i8.8)')

lat=reform(gphit(0,0:jpj-1))
lon=reform(glamt(0:jpi-1,0))
time=time-julday(1,1,1950) & jpt=n_elements(time)

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'}
sw_attr={units:'w/m^2',missing_value:1.e20,long_name:'Net Shortwave Radiation',short_name:'swr',axis:'TYX'}
globattr={source:'Obtained from ISCCP.  Corrections has been done on mean bias and variability',timerange:cda0+' - '+cda1}

ncfields = 'swr[longitude,latitude,time]=swr:sw_attr; ' $
                      + 'longitude[]=lon:lon_attr; ' $
                      + 'latitude[]=lat:lat_attr; ' $
                      + 'time[*time]=time:time_attr ' $
                      + ' @ globattr'

@ncdf_quickwrite

end