;+
;
; .. _interp_erai_lwr_1989_2009.pro:
;
; =============================
; interp_erai_lwr_1989_2009.pro
; =============================
;
;     .. graphviz::
;
;        digraph interp_erai_lwr_1989_2009 {
;           graph [
;           rankdir="LR",
;           ]
;           mask [shape=ellipse,fontname=Courier,label="${TROPFLUX_ID}/mask_oaflux_30N30S.nc"];
;
;           file_in [shape=ellipse,fontname=Courier,label="/Volumes/PRAVEEN/ERAI_global/20c3m_erai_str_TROP_1989_2009.nc"];
;
;           ncfile [shape=ellipse,fontname=Courier,label="/Volumes/PRAVEEN/TropFlux/input_uncor/erai_lwr_19890102_20091231_oafluxgrid.nc"];
;
;           interp_erai_lwr_1989_2009 [shape=box,
;           fontname=Courier,
;           color=blue,
;           URL="http://forge.ipsl.jussieu.fr/tropflux/browser/trunk/src/interp_erai_lwr_1989_2009.pro",
;           label="${TROPFLUX}/src/interp_erai_lwr_1989_2009.pro"];
;
;           {mask file_in} -> {interp_erai_lwr_1989_2009} -> {ncfile}
;
;         }
;
; SEE ALSO
; ========
;
; :ref:`tropflux_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>`
;
; EXAMPLES
; ========
;
; ::
;
;  IDL> interp_erai_lwr_1989_2009
;
; TODO
; ====
;
; hard coded directory - usage of ${TROPFLUX_ID}
;
; 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
; ==========
;
; - 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
@common
;
; check for input directory
;
; test if ${TROPFLUX_ID} defined
tropflux_id_env=GETENV('TROPFLUX_ID')
CASE tropflux_id_env OF
    ''  :  BEGIN
     msg = 'eee : ${TROPFLUX_ID} is not defined'
     ras = report(msg)
     STOP
           END
 ELSE: BEGIN
     msg = 'iii : ${TROPFLUX_ID} is ' + tropflux_id_env
     ras = report(msg)
       END
ENDCASE
;
iodirin = isadirectory(tropflux_id_env)
;
; existence and protection of ${TROPFLUX_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

filein='/Volumes/PRAVEEN/ERAI_global/20c3m_erai_str_TROP_1989_2009.nc'
initncdf, filein
lwrin=read_ncdf("str",0,7668,/timestep,file=filein,/nostr)
lwrin=-1*lwrin
help, lwrin

initncdf, filein
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)

help, lwrin

si=size(swrin)
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')
  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='!/Volumes/PRAVEEN/TropFlux/input_uncor/erai_lwr_19890102_20091231_oafluxgrid.nc'

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}

help,lwrout

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