;+
;PROCEDURE: 
;	MVN_SEP_ANC_READ_CDF
;PURPOSE: 
;	Routine to read CDF ancillary and ephemeris data files
;AUTHOR: 
;	Robert Lillis (rlillis@ssl.Berkeley.edu)
;CALLING SEQUENCE:
;	MVN_SEP_READ_L2_ANC_CDF, ffile
;KEYWORDS:
	


pro mvn_sep_anc_read_cdf, file, tplot = tplot, sep_ancillary = sep_ancillary 

 cdfi = cdf_load_vars(file,/all,/verbose)
 vns = cdfi.vars.name
 nvars = n_elements (vns)
 inf = sqrt(-7.7)
 
;epoch time.
 epoch = *cdfi.vars[1].dataptr
; UNIX time
 times = *cdfi.vars[0].dataptr
 
 nt = n_elements (times)
; here we define the tags for the ancillary/ephemeris data structure.
  SEP_ancillarya = {time: 0d, look_directions_MSO:fltarr(4, 3),look_directions_SSO:fltarr(4, 3), $
                    look_directions_GEO:fltarr (4, 3), FOV_sun_angle:fltarr(4), FOV_ram_angle: fltarr(4), $
                    fraction_FOV_Mars:fltarr(4), fraction_FOV_illuminated:fltarr(4), Mars_fraction_sky:sqrt(-6.6), $
                    qrot_SEP1_to_MSO: fltarr(4), qrot_SEP2_to_MSO: fltarr(4), $
                    qrot_SEP1_to_SSO: fltarr(4), qrot_SEP2_to_SSO: fltarr(4), $
                    qrot_SEP1_to_GEO: fltarr(4), qrot_SEP2_to_GEO: fltarr(4), $
                    mvn_pos_MSO:fltarr(3),mvn_pos_GEO:fltarr(3),mvn_pos_ECLIPJ2000:fltarr(3), $
                    Earth_pos_ECLIPJ2000:fltarr(3),Mars_pos_ECLIPJ2000:fltarr(3),$
                    mvn_lat_GEO:sqrt(-6.6), mvn_elon_GEO:sqrt(-6.6), mvn_alt_areoid:sqrt(-6.6), mvn_sza:sqrt(-7.7), $
                    mvn_slt:sqrt(-7.7)} 
                    
  SEP_ancillary = replicate (SEP_ancillarya, nt)
  SEP_ancillary.time = times
 
 
; SEP look directions in three coordinate systems
  look_directions_MSO =[[[*cdfi.vars[5].dataptr]], [[*cdfi.vars[6].dataptr]],$
    [[*cdfi.vars[7].dataptr]],[[*cdfi.vars[8].dataptr]]]
  look_directions_SSO =[[[*cdfi.vars[9].dataptr]], [[*cdfi.vars[10].dataptr]],$
    [[*cdfi.vars[11].dataptr]],[[*cdfi.vars[12].dataptr]]]
  look_directions_GEO =[[[*cdfi.vars[13].dataptr]], [[*cdfi.vars[14].dataptr]],$
    [[*cdfi.vars[15].dataptr]],[[*cdfi.vars[16].dataptr]]]
  
  SEP_ancillary.look_directions_MSO = transpose (look_directions_MSO, [2, 1, 0])
  SEP_ancillary.look_directions_SSO = transpose (look_directions_SSO, [2, 1, 0])
  SEP_ancillary.look_directions_GEO = transpose (look_directions_GEO, [2, 1, 0])
  
  dimensions = size(look_directions,/dimensions)
  
  SEP_ancillary.FOV_sun_angle = transpose ([[*cdfi.vars[20].dataptr], [*cdfi.vars[21].dataptr],[*cdfi.vars[22].dataptr],[*cdfi.vars[23].dataptr]])
  SEP_ancillary.FOV_ram_angle = transpose ([[*cdfi.vars[24].dataptr], [*cdfi.vars[25].dataptr],[*cdfi.vars[26].dataptr],[*cdfi.vars[27].dataptr]])
  SEP_ancillary.fraction_FOV_Mars = transpose ([[*cdfi.vars[28].dataptr], [*cdfi.vars[29].dataptr],[*cdfi.vars[30].dataptr],[*cdfi.vars[31].dataptr]])
  SEP_ancillary.fraction_FOV_illuminated = transpose ([[*cdfi.vars[32].dataptr], [*cdfi.vars[33].dataptr],[*cdfi.vars[34].dataptr],[*cdfi.vars[35].dataptr]])
  SEP_ancillary.Mars_fraction_sky = *cdfi.vars[36].dataptr
  SEP_ancillary.qrot_SEP1_to_MSO = transpose (*cdfi.vars[37].dataptr)
  SEP_ancillary.qrot_SEP2_to_MSO = transpose (*cdfi.vars[38].dataptr)
  SEP_ancillary.qrot_SEP1_to_SSO = transpose (*cdfi.vars[39].dataptr)
  SEP_ancillary.qrot_SEP2_to_SSO = transpose (*cdfi.vars[40].dataptr)
  SEP_ancillary.qrot_SEP1_to_GEO = transpose (*cdfi.vars[41].dataptr)
  SEP_ancillary.qrot_SEP2_to_GEO = transpose (*cdfi.vars[42].dataptr)
  SEP_ancillary.mvn_pos_MSO = transpose (*cdfi.vars[43].dataptr)
  SEP_ancillary.mvn_pos_GEO = transpose (*cdfi.vars[44].dataptr)
  SEP_ancillary.mvn_pos_ECLIPJ2000 = transpose (*cdfi.vars[45].dataptr)
  SEP_ancillary.Earth_pos_ECLIPJ2000 = transpose (*cdfi.vars[46].dataptr)
  SEP_ancillary.Mars_pos_ECLIPJ2000 = transpose (*cdfi.vars[47].dataptr)
  SEP_ancillary.mvn_lat_GEO=*cdfi.vars[48].dataptr
  SEP_ancillary.mvn_elon_GEO=*cdfi.vars[49].dataptr
  SEP_ancillary.mvn_alt_areoid = mvn_get_altitude(reform (SEP_ancillary.mvn_pos_GEO[0,*]),reform (SEP_ancillary.mvn_pos_GEO[1,*]),$
    reform (SEP_ancillary.mvn_pos_GEO[2,*]))
  SEP_ancillary.mvn_sza=*cdfi.vars[50].dataptr
  SEP_ancillary.mvn_slt=*cdfi.vars[51].dataptr
  
  
  if keyword_set (tplot) then begin
  colors_3_lines = [80, 150, 240]
  store_data, 'SEP_FOV_Front1_MSO', data = {x: times,y:reform (look_directions_MSO [*, 0,*])}
  store_data, 'SEP_FOV_Back1_MSO', data = {x: times,y:reform (look_directions_MSO [*, 1,*])}
  store_data, 'SEP_FOV_Front2_MSO', data = {x: times,y:reform (look_directions_MSO [*, 2,*])}
  store_data, 'SEP_FOV_Back2_MSO', data = {x: times,y:reform (look_directions_MSO [*, 3,*])}
 
  store_data, 'SEP_FOV_Front1_SSO', data = {x: times,y:reform (look_directions_SSO [*, 0,*])}
  store_data, 'SEP_FOV_Back1_SSO', data = {x: times,y:reform (look_directions_SSO [*, 1,*])}
  store_data, 'SEP_FOV_Front2_SSO', data = {x: times,y:reform (look_directions_SSO [*, 2,*])}
  store_data, 'SEP_FOV_Back2_SSO', data = {x: times,y:reform (look_directions_SSO [*, 3,*])}
 
  store_data, 'SEP_FOV_Front1_GEO', data = {x: times,y:reform (look_directions_GEO [*, 0,*])}
  store_data, 'SEP_FOV_Back1_GEO', data = {x: times,y:reform (look_directions_GEO [*, 1,*])}
  store_data, 'SEP_FOV_Front2_GEO', data = {x: times,y:reform (look_directions_GEO [*, 2,*])}
  store_data, 'SEP_FOV_Back2_GEO', data = {x: times,y:reform (look_directions_GEO [*, 3,*])}
  
; this tplot section not finished.  
  
  store_data, 'SEP_sun_angle', data ={x: times,y:transpose (SEP_ancillary.FOV_sun_angle)}
  store_data, 'SEP_ram_angle', data ={x: times,y:transpose (SEP_ancillary.FOV_ram_angle)}
  options,'SEP_FOV*', 'colors', colors_3_lines
 
  ylim,'SEP_FOV*', [-1.0, 1.0]
 
  options, 'SEP_FOV_*', 'labels', ['X', 'Y', 'Z']

  tplot, ['SEP_FOV*']
  endif
  
  
  
  
  
end