M2_smoothGDB channel description

X              X-Koordinate in AGAPLC-projection
Y              Y-Koordinate in AGAPLC-projection
Date           Date of flight
Time           Time from ?
Longitude      GPS-longitude (differential)
Latitude       GPS-latitude (differential)
Altitude       GPS-Altitude (differential)
RMAG1          raw magnetometer value from sensor 1 in nT
RMAG2          raw magnetometer value from sensor 2 in nT
PMAG1          compensated (Michael Studinger) magnetometer value from sensor 1 in nT
PMAG2          compensated (Michael Studinger) magnetometer value from sensor 2 in nT
PMAG2_TT       TipTank corrected (Bob Kucks) PMAG2
sfil30         30 minutes filtered base station values AGAPsouth (Detlef Damaske)
nfil30         30 minutes filtered base station values AGAPnorth (Detlef Damaske)
sfil30_int     interpolated from sfil30
nfil30_int     interpolated from nfil30
dgrf           DGRF (model 2005) calculated for Date-channel
TT             Tiptank correction value (Detlef Damaske)
PMAG2_TTC      TipTank corrected (Detlef Damaske) PMAG2
PMAG2_DSP      Despiked (as much as possible - Detlef Damaske) from PMAG2_TTC
PMAG2_DSP_dgrf = PMAG2_DSP - dgrf
sbm_corr       = sfil30_int - 55353 (nT) (mean base value)
nbm_corr       = nfil30_int - 54787 (nT) (mean base value)
SNbm_corr      correction channel after application of USGS routine USGS_mbase.gx
Baro           barometric original value ?
Epoch_sec      Epoch seconds of GPS system
totmag         = PMAG2_TT - sbm_corr (Bob Kucks) 
resmag         = totmag - dgrf       (Bob Kucks)
resmag_tlv     standardized normal flight/tie line levelling (Bob Kucks) 
resmag_tmlv    microlevelling (Bob Kucks) 
UTC_sec        seconds in UT-time ?
XFG            value for x-component of fluxgate magnetometer
YFG            value for Y-component of fluxgate magnetometer
ZFG            value for Z-component of fluxgate magnetometer
M2_sbm         = PMAG2_DSO_dgrf - sbm_corr
M2_SNbm        = PMAG2_DSO_dgrf - SNbm_corr
SNbm_SAFE      for Lines TFR10230 and 10230 only: concerning a "jump" stemming from nfil30_int in Bob Kucks data base
M2SNsmooth     final value before levelling: low pass filtered (45sec) M2S_SNbm