;+
;
; .. _ws_correction_ncdf.pro:
;
; ======================
; ws_correction_ncdf.pro
; ======================
;
;     .. graphviz::
;
;        digraph ws_correction_ncdf {
;           graph [
;           rankdir="LR",
;           ]
;           file_in [shape=ellipse,fontname=Courier,label="/Volumes/PRAVEEN/TropFlux/input_uncor/erai_ws_19890101_20091231_oafluxgrid.nc"];
;           ncfile [shape=ellipse,fontname=Courier,label="/Volumes/PRAVEEN/TropFlux/input_cor/full_cor/TropFlux_ws_19890101_20091231_v20.nc"];
;           ws_correction_ncdf [shape=box,
;           fontname=Courier,
;           color=blue,
;           URL="http://forge.ipsl.jussieu.fr/tropflux/browser/trunk/src/ws_correction_ncdf.pro",
;           label="${TROPFLUX}/src/ws_correction_ncdf.pro"];
;
;           {file_in} -> {ws_correction_ncdf} -> {ncfile}
;
;          }
;
; SEE ALSO
; ========
;
; EXAMPLES
; ========
;
; ::
;
;  IDL> ws_correction_ncdf
;
; TODO
; ====
;
; hard coded directory - usage of ${TROPFLUX_ID}
;
; coding rules
;
; EVOLUTIONS
; ==========
;
; - fplod 20101215T115916Z aedon.locean-ipsl.upmc.fr (Darwin)
;
;   * add graph in header
;
; - fplod 20101214T093615Z aedon.locean-ipsl.upmc.fr (Darwin)
;
;   * minimal header
;
; - pbk 2008
;
;   * creation
;
;-
pro ws_correction_ncdf
@common
da1=19880101 & da2=20101231

file='/Volumes/PRAVEEN/TropFlux/input_uncor/erai_ws_19890101_20091231_oafluxgrid.nc'
initncdf, file
u=read_ncdf('u10',da1,da2,file=file,/nostr)
v=read_ncdf('v10',da1,da2,file=file,/nostr)
w=sqrt(u*u+v*v)

help, w

w_mean=grossemoyenne(w,'t',/nan)
help, w_mean

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

for jt=0,jpt-1 do begin
  jtt=(time(jt)-julday(1,1,yea(jt))) < 364
  q=reform(w_mean(*,*))
  w_m(*,*,jt)=q
endfor
help, w_m

w_ano=w-w_m

;; correction for mean based on scatter
;w_m=w_m+0.282667    ;; (2000-2008)
w_m=w_m+0.276739     ;; (2000-2009)

help, w_ano

;; applying the correction for varyability based on the scatter
;w_ano=w_ano*(1/0.897667)   ;; (2000-2008)
w_ano=w_ano*(1/0.903587)    ;; (2000-2009)

w_new=w_m+w_ano
help, w_new

;writing field
lat=reform(gphit(0,0:jpj-1))
lon=reform(glamt(0:jpi-1,0))
time=timegen(7670, units='days', start=julday(1,1,1989,0)) & 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_ws_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'}
w_attr={units:'m/s',missing_value:1.e20,long_name:'mean wind speed',short_name:'w',axis:'TYX'}
globattr={source:'Basic data obtained from ERAI. Bias and variability correction are applied',timerange:cda0+' - '+cda1}


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

@ncdf_quickwrite

end