;+
;
; .. _sst_correction_ncdf.pro:
;
; =======================
; sst_correction_ncdf.pro
; =======================
;
;     .. graphviz::
;
;        digraph sst_correction_ncdf {
;           graph [
;           rankdir="LR",
;           ]
;
;           file_sst [shape=ellipse,fontname=Courier,label="/Volumes/PRAVEEN/TropFlux/input_uncor/erai_sst_19890101_20091231_oafluxgrid.nc"];
;
;           ncfile [shape=ellipse,fontname=Courier,label="/Volumes/PRAVEEN/TropFlux/input_cor/full_cor/TropFlux_sst_19890101_20091231_v20.nc"];
;
;           sst_correction_ncdf [shape=box,
;           fontname=Courier,
;           color=blue,
;           URL="http://forge.ipsl.jussieu.fr/tropflux/browser/trunk/src/sst_correction_ncdf.pro",
;           label="${PROJECT}/src/sst_correction_ncdf.pro"];
;
;           {file_sst} -> {sst_correction_ncdf} -> {ncfile}
;
;        }
;
;
; SEE ALSO
; ========
;
; :func:`initncdf <saxo:initncdf>`
; :func:`read_ncdf <saxo:read_ncdf>`
; :func:`grossemoyenne <saxo:grossemoyenne>`
; :func:`julday <saxo:julday>`
; :func:`ncdf_quickwrite <saxo:ncdf_quickwrite>`
;
; EXAMPLES
; ========
;
; ::
;
;  IDL> sst_correction_ncdf
;
; TODO
; ====
;
; hard coded directory - usage of ${PROJECT_ID}
;
; coding rules
;
; EVOLUTIONS
; ==========
;
; - fplod 20101215T114224Z aedon.locean-ipsl.upmc.fr (Darwin)
;
;   * add graph in header
;
; - fplod 20101214T093615Z aedon.locean-ipsl.upmc.fr (Darwin)
;
;   * minimal header
;
; - pbk 2008
;
;   * creation
;
;-
pro sst_correction_ncdf
@common
da1=19880101 & da2=20091231

file='/Volumes/PRAVEEN/TropFlux/input_uncor/erai_sst_19890101_20091231_oafluxgrid.nc'
initncdf, file
sst=read_ncdf('sst',da1,da2,file=file,/nostr) & sst=sst-273.15
help, sst

sst_mean=grossemoyenne(sst,'t',/nan)
help, sst_mean

tt=time & jpt=n_elements(time)
caldat, time,mon,day,yea
sst_m=sst*0.

for jt=0,jpt-1 do begin
  jtt=(time(jt)-julday(1,1,yea(jt))) < 364
  t=reform(sst_mean(*,*))
  sst_m(*,*,jt)=t
endfor
help, sst_m

sst_ano=sst-sst_m

;; correction for mean based on scatter
;sst_m=sst_m+0.0521111   ;; (2000-2008)
sst_m=sst_m+0.0533692    ;; (2000-2009)

help, sst_ano

;; applying the correction for varyability based on the scatter
;sst_ano=sst_ano*(1/0.989889)  ;; (2000-2008)
sst_ano=sst_ano*(1/0.986196)   ;; (2000-2009)

sst_new=sst_m+sst_ano+273.15
help, sst_new

;writing field
lat=reform(gphit(0,0:jpj-1))
lon=reform(glamt(0:jpi-1,0))
time=timegen(7670, units='days', start=julday(1,1,1989)) & jpt=n_elements(time)

cda0=string(jul2date(time(0)),format='(i8.8)')
cda1=string(jul2date(time(jpt-1)),format='(i8.8)')

time=time-julday(1,1,1950) & jpt=n_elements(time)

ncfile='!/Volumes/PRAVEEN/TropFlux/input_cor/full_cor/TropFlux_sst_19890101_20091231_v20.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'}
sst_attr={units:'degK',missing_value:1.e20,long_name:'Sea Surface Temperature',short_name:'sst',axis:'TYX'}
globattr={source:'Basic data obtained from ERAI.  Bias and variability correction are applied',timerange:cda0+' - '+cda1}


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

@ncdf_quickwrite

end