;+
;
; .. _lwr_correction_ncdf.pro:
;
; =======================
; lwr_correction_ncdf.pro
; =======================
;
;     .. graphviz::
;
;        digraph lwr_correction_ncdf {
;           graph [
;           rankdir="LR",
;           ]
;
;           file_in [shape=ellipse,fontname=Courier,label="/Volumes/PRAVEEN/TropFlux/input_uncor/erai_lwr_19890102_20091231_oafluxgrid.nc"];
;
;           ncfile [shape=ellipse,fontname=Courier,label="/Volumes/PRAVEEN/TropFlux/input_cor/full_cor/TropFlux_lwr_19890101_20091231_v1.nc"];
;           lwr_correction_ncdf [shape=box,
;           fontname=Courier,
;           color=blue,
;           URL="http://forge.ipsl.jussieu.fr/tropflux/browser/trunk/src/lwr_correction_ncdf.pro",
;           label="${PROJECT}/src/lwr_correction_ncdf.pro"];
;
;           {file_in} -> {lwr_correction_ncdf} -> {ncfile}
;
;        }
;
; SEE ALSO
; ========
;
; :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> lwr_correction_ncdf
;
;
; TODO
; ====
;
; hard coded directory - usage of ${PROJECT_ID}
;
; coding rules
;
; EVOLUTIONS
; ==========
;
; - fplod 20101215T113707Z aedon.locean-ipsl.upmc.fr (Darwin)
;
;   * add graph in header
;
; - fplod 20101214T093615Z aedon.locean-ipsl.upmc.fr (Darwin)
;
;   * minimal header
;
; - pbk 2008
;
;   * creation
;
;-
pro lwr_correction_ncdf
@common
da1=19880101 & da2=20091231

file='/Volumes/PRAVEEN/TropFlux/input_uncor/erai_lwr_19890102_20091231_oafluxgrid.nc'
initncdf, file
lwr=read_ncdf('lwr',da1,da2,file=file,/nostr)
help, lwr

lwr_mean=grossemoyenne(lwr,'t',/nan)
help,lwr_mean

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

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

lwr_ano=lwr-lwr_m

;; correction for mean based on scatter
lwr_m=lwr_m+4.61667

help, lwr_ano

;; applying the correction for varyability based on the scatter
lwr_ano=lwr_ano*(1/0.760667)

;; applying the correction for varyability based on the scatter

lwr_new=lwr_m+lwr_ano
help, lwr_new

;writing field
lat=reform(gphit(0,0:jpj-1))
lon=reform(glamt(0:jpi-1,0))
time=timegen(7669, units='days', start=julday(1,2,1989)) & 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_lwr_19890101_20091231_v1.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:'degK',missing_value:1.e20,long_name:'Air Temperature at 2m',short_name:'lwr',axis:'TYX'}
globattr={source:'Basic data obtained from ERAI.  Mean correction for  bias and correction for variability are applied',timerange:cda0+' - '+cda1}


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

@ncdf_quickwrite

end