Binary format parameters

Available up-to-date corrections for Topex/Poseidon

Corrections added by the CTOH are shown in light blue

Header parameters

Parameter name Unity
cycle cycle
track track
nbr_point number of points in this track

 

Record description

Parameter name Description Units
Microseconde Microseconds in milliseconds 10-6 s
Milliseconde Milliseconds in days 10-3 s
Jour58 Days since 01/01/1958 jour
Minute Minutes in day min
Seconde Seconds in minutes 10-6 s
Converting from NASA (from 01/01/1958) to CNES Julian dates (from 01/01/1950) : 
day (sec) = Jour58*86400 + Milliseconde / 1000 + Microseconde / 10E6 
OR : day (sec) = Jour58*86400 + Minute * 60 + Seconde / 10E6 

From CNES to NASA dates (CNES) :
add 2922 * 86400 seconds
Latitude Latitude 10-6 deg
Longitude Longitude 10-6 deg
Haut_nasa Orbital height from NASA reference ellipsoid 10-3 m
Haut_cnes Orbital height from CNES reference ellipsoid 10-3 m
Haut_alti_mesure Range 10-3 m
Sat_alt_hi_rate1 à 10 Satellite altitude diffrence from haut_nasa 10-3 m
H_alt_sme1 à 10 Satellite altitude diffrence from haut_alti_mesure 10-3 m
Rms_h_alt haut_alti_mesure RMS 10-3 m
Wet_corr Wet troposphere correction during measurement 10-3 m
Wet_b_corr Wet troposphere correction before measurement 10-3 m
Wet_a_corr Wet troposphere correction after measurement 10-3 m
Wet_h_rad Wet troposphere correction from radiometer 10-3m
">Wet_tropo_CLS Wet troposphere correction (NCEP CLS) 10-3 m
gcp_corr2wet_rad GCPs correction to wet tropo correction (corrects from Topex Microwave Radiometer drift) 10-3 m
tmr_drift GCPs correction to wet tropo correction (corrects from yaw effects) 10-3 m
Dry Dry troposphere correction during measuremen 10-3 m
Iono_bad_cor Iono_corr quality flag n/a
Iono_cor Ionosphere correction (TOPEX dual frequency) 10-3 m
Iono_doris Ionosphere correction (from DORIS) 10-3 m
Iono_bent Ionosphere correction (from BENT model) 10-3 m
Ionotp_dorlis Smoothed ionosphere correction (Topex dual or Doris) 10-3 m
gcp_corr2iono GCPs correction to ionosphere wet tropo correction 10-3 m
gim_ku Ionosphere correction (from GIM model) 10-3 m
Baro Inverse barometer during measurement 10-3 m
Ib_MOG2D Inverse barometer (MOG2D) 10-5 m
Ib_ECMWF Inverse barometer (ECMWF 6h) 10-5 m
Haut_maree_GOT Ocean tidal height (GOT2000) 10-3 m
Haut_maree_FES Ocean tidal height (FES2004) 10-3 m
Effet_charge_FES Load tide (FES1999) 10-3 m
Haut_maree_polaire Polar geocentric tidal height 10-3 m
Haut_maree_solide Solid tidal height 10-3 m
Biais_emcnes Electromagnetic Bias Ku band correction (BM4 - CNES) 10-3 m
Biais_emnasa Electromagnetic Bias Ku band correction (TGS - NASA) 10-3 m
Biais_emnp Non-parametric EM bias 10-3 m
gcp_cssb GCPs correction (Chambers) to CNES EM bias (Biais_emcnes) 10-3 m
gcp_corr2BM4 GCPs correction (Gaspar) to CNES EM bias (Biais_emcnes) corretion des GCP au biais electromagnétique non parametrique (Gaspar) à appliquer au Biais_emcnes 10-3 m
Haut_mss Mean Sea Surface height CLS 01 10-3 m
Haut_geoid Geoid height 10-3 m
geoid_grace geoid height GRACE 10-3 m
Bathy Ocean depth m
Swh_k Significant wave height (ku band) 10-2 m
Swh_c Significant wave height (c band) 10-2 m
Rms_swh_k Swh_k RMS 10-2 m
Rms_swh_c Swh_c RMS 10-2 m
Sigma0_k Backscattering coefficient (ku band) 10-2 dB
Sigma0_c Backscattering coefficient (c band) 10-2 dB
gcp_sig0_k GCPs correction to Sigma0_k 10-2 dB
gcp_sig0_c GCPs correction to Sigma0_c 10-2 dB
Agc_k Automatic Gain Control (ku band) 10-2 dB
Agc_c Automatic Gain Control (c band) 10-2 dB
Rms_Agc_k Agc_k RMS 10-2 dB
Rms_Agc_c Agc_c RMS 10-2 dB
Vent Wind speed from altimetric measurements 10-1 m/s
Tb_18 Brightness temperature at 18 Ghz 10-2 K
gcp_corr2tb18 GCPs correction to Tb_18 10-2 dB
Tb_21 Brightness temperature at 21 Ghz 10-2 K
Tb_37 Brightness temperature at 37 Ghz 10-2 K
Alton Altimeter flag 0--> Poseidon, 1--> Topex
Is_topex Topex instrument status n/a
Swh_pts_avg Number of valid points for SWH calculation n/a
Valid_pts Number of valid points for altitude calculation at 1s n/a
Attitude 1 Attitude Waveform 10-2 deg
Attitude 2 Attitude platform 10-2 deg
Centre_masse_antenne Correction to center of mass movements forHaut_alti_mesure 10-3 m
Barotrope Barotrope 10-3 m
Critere Point quality index 1--> one unique point, 2--> 2 points, 10--> due to bathymetry at 200m
Geo_bad1 Ocean/Land/Ice flag n/a
Geo_bad2 Tide/Rain flags -
Alt_bad1 Measurement flag for T/P type 1 n/a
Alt_bad2 Measurement flag for T/P type 2 n/a
Fl_att Attitude flag n/a

 

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