OPR_pass_file_data_record

binary record ""

size: 180

field name

definition

binary int32	size: 4
Measurement number in the pass-file

MCD

binary record

size: 4

This element is the Measurement Confidence Data, which regroups all the flags related to the 1-Hz altimeter measurement. 1-Hz altimeter quality flags are derived from the quality of 20-Hz ocean elementary measurements. A 1-Hz altimeter quality flag is set to "bad" if at least one of the corresponding elementary estimates is "bad" (i.e. out-of-range); otherwise it is set to "good". These engineering level flags may be considered as useful information for software validation, but their systematic use for editing data is to consider with care.

field name

definition

Valid

binary uint8	size: 0:1
Measurement validity (0 = Valid, 1 = Invalid). A 1-Hz measurement is valid if it contains at least one 20-Hz elementary measurement declared "ocean" in the processing; it is invalid otherwise.

Causes

binary uint8	size: 0:3
Cause of invalidity for invalid measurements (1 = Acquisition mode, 2 = Not acquisition mode but over land (measurements over land are provided in OPR as invalid measurements), 3 = Not acquisition mode, not over land, but not "ocean" measurement, 4 = Other operating mode (generally ice tracking mode)

Qua_Raw

binary uint8	size: 0:1
Quality of range estimate (0 = Good , 1 = Bad)

Qua_Tele_Param

binary uint8	size: 0:1
Quality of telemetry parameters for range computation (0 = Good , 1 = Bad)

Qua_Cal_Cor

binary uint8	size: 0:1
Quality of internal calibration correction to range (0 = Good , 1 = Bad)

Qua_SWH

binary uint8	size: 0:1
Quality of significant wave height estimate (0 = Good , 1 = Bad)

Qua_Sigma0

binary uint8	size: 0:1
Quality of backscatter coefficient estimate (0 = Good , 1 = Bad)

Qua_Tele_Sigma0

binary uint8	size: 0:1
Quality of telemetry parameters for backscatter coefficient computation (0 = Good , 1 = Bad)

Qua_Sigma0_Cal_Cor

binary uint8	size: 0:1
Quality of internal calibration correction to backscatter coefficient (0 = Good , 1 = Bad)

Qua_Deriv

binary uint8	size: 0:1
Quality of range derivative estimate (0 = Good , 1 = Bad)

Typ_Alt_Cal_Cor

binary uint8	size: 0:1
Type of internal calibration for range correction (0 = Single Point Target Response, 1 = Invalid)

Typ_Sigma0_Cal_Cor

binary uint8	size: 0:1
Type of internal calibration for backscatter coefficient correction (0 = Single Point Target Response, 1 = Invalid)

Typ_Ocean_T

binary uint8	size: 0:1
Type of ocean tracking (0 = Nominal, 1 = Preset)

Sig_Wind_Sp

binary uint8	size: 0:1
Backscatter coefficient value for wind speed computation (0 = Nominal, 1 = Out-of-range)

Corr_Tide

binary uint8	size: 0:1
Presence / Absence of tide corrections (0 = Presence, 1 = Absence)

Sim_Radio

binary uint8	size: 0:1
Presence / Absence of a simultaneous radiometer data (0 = Presence, 1 = Absence)

Corr_TB_23

binary uint8	size: 0:1
23.8 GHz brightness temperature value (TB_23) for altimetric correction (0 = Nominal, 1 = Out-of-range)

Corr_TB_36

binary uint8	size: 0:1
36.5 GHz brightness temperature value (TB_36) for altimetric correction (0 = Nominal, 1 = Out-of-range)

OL_Flag

binary uint8	size: 0:1
Ocean / Land flag for the radiometer (0 = ocean, 1 = land)

Corr_Tropos

binary uint8	size: 0:1
Presence / Absence of meteorological wet tropospheric correction (0 = Presence, 1 = Absence)

MSS_DPAF

binary uint8	size: 0:1
Presence / Absence of DPAF mean sea surface (0 = Presence, 1 = Absence (the four MSS nearby grid points over land))

Manoeuvre

binary uint8	size: 0:1
Orbit quality - manoeuvre (0 = Nominal, 1 = Manoeuvre). Set to 1 when the orbit quality is affected by a satellite manoeuvre. The corresponding orbit altitude H_Sat is computed, but is wrong.

MSS_OSU

binary uint8	size: 0:1
Presence / Absence of OSU mean sea surface (0 = Presence, 1 = Absence (the four MSS nearby grid points over land))

Inv_Rad_Orb

binary uint8	size: 0:2
Cause of invalidity of radial orbit correction (1 = radial orbit correction exceeds 60 cm, 2 = altimeter data on land, 3 = no OPR1 altimeter data available)

Unused

binary bytes	size: 0:5
Spare

hidden: true

Tim_1

binary int32	size: 4
time stamp 1 (UTC time, in seconds, elapsed between the reference epoch (January 01, 1990 0 h.) and the time of the 1-Hz altimeter measurement, corresponding to the centre of the footprint). unit: "s since 1990-01-01"

Tim_2

binary int32	size: 4
time stamp 2 (number of microseconds elapsed since the rounded second given in tim_1). unit: "1e-6 s"

Lat

binary int32 (double)	size: 4
latitude unit: "1e-6 degrees_north" converted unit: "degrees_north" (multiply by 1/1000000)

Lon

binary int32 (double)	size: 4
longitude unit: "1e-6 degrees_east" converted unit: "degrees_east" (multiply by 1/1000000)

Nval

binary int32	size: 4
number of averaged 20-Hz measurements

H_Alt_Raw

binary int32 (double)	size: 4
Range: raw value unit: "1e-3 m" converted unit: "m" (multiply by 1/1000)

Std_H_Alt

binary int32 (double)	size: 4
Standard deviation on range unit: "1e-3 m" converted unit: "m" (multiply by 1/1000)

H_Alt_SME

binary array[10]

size: 20

Difference of the i-th 10-Hz range from H_Alt_Raw (i=1,10)

binary int16 (double) size: 2

unit: "1e-3 m"

converted unit: "m" (multiply by 1/1000)

Tim_SME

binary array[10]

size: 20

Difference of the i-th 10-Hz time from Tim_1, Tim_2

binary int16 (double) size: 2

unit: "1e-4 s"

converted unit: "s" (multiply by 1/10000)

H_Alt

binary int32 (double)	size: 4
Range corrected fro instrumental effects unit: "1e-3 m" converted unit: "m" (multiply by 1/1000)

H_Alt_LUT_Cor

binary int16 (double)	size: 2
Look-up table correction to range unit: "1e-3 m" converted unit: "m" (multiply by 1/1000)

H_Alt_Dop_Cor

binary int16 (double)	size: 2
Doppler correction to range unit: "1e-3 m" converted unit: "m" (multiply by 1/1000)

H_Alt_Cal_Cor_1

binary int32 (double)	size: 4
Internal calibration correction to range unit: "1e-3 m" converted unit: "m" (multiply by 1/1000)

H_Alt_Cal_Cor_2

binary int32 (double)	size: 4
Initial setting for internal calibration correction to range unit: "1e-3 m" converted unit: "m" (multiply by 1/1000)

Range_Deriv

binary int16 (double)	size: 2
Range first derivative unit: "1e-2 m/s" converted unit: "m/s" (multiply by 1/100)

Dry_Cor

binary int16 (double)	size: 2
Dry tropospheric correction to range unit: "1e-3 m" converted unit: "m" (multiply by 1/1000)

Wet_Cor

binary int16 (double)	size: 2
Meteorological wet tropospheric correction to range unit: "1e-3 m" converted unit: "m" (multiply by 1/1000)

Pres_Err

binary int16 (double)	size: 2
Pressure field error unit: "1e2 Pa" converted unit: "Pa" (multiply by 100/1)

Wet_H_Rad

binary int16 (double)	size: 2
Radiometer wet tropospheric correction to range unit: "1e-3 m" converted unit: "m" (multiply by 1/1000)

Iono_Cor

binary int16 (double)	size: 2
Ionospheric correction to range unit: "1e-3 m" converted unit: "m" (multiply by 1/1000)

SSB_Cor

binary int16 (double)	size: 2
Sea state bias correction to range unit: "1e-3 m" converted unit: "m" (multiply by 1/1000)

H_Eot

binary int16 (double)	size: 2
Elastic ocean tide unit: "1e-3 m" converted unit: "m" (multiply by 1/1000)

H_Lt

binary int16 (double)	size: 2
Tidal loading effect unit: "1e-3 m" converted unit: "m" (multiply by 1/1000)

H_Set

binary int16 (double)	size: 2
Solid earth tide unit: "1e-3 m" converted unit: "m" (multiply by 1/1000)

H_Geo

binary int32 (double)	size: 4
Geoid height unit: "1e-3 m" converted unit: "m" (multiply by 1/1000)

H_MSS_DPAF

binary int32 (double)	size: 4
Mean sea surface height unit: "1e-3 m" converted unit: "m" (multiply by 1/1000)

H_Sat

binary int32 (double)	size: 4
Altitude above the reference ellipsoid unit: "1e-3 m" converted unit: "m" (multiply by 1/1000)

Orb_Err

binary int32 (double)	size: 4
Orbit error unit: "1e-3 m" converted unit: "m" (multiply by 1/1000)

SWH_Raw

binary int16 (double)	size: 2
Significant wave height - raw value unit: "1e-2 m" converted unit: "m" (multiply by 1/100)

Std_SWH

binary int16 (double)	size: 2
Standard deviation on significant wave height unit: "1e-2 m" converted unit: "m" (multiply by 1/100)

SWH

binary int16 (double)	size: 2
Significant wave height corrected for instrumental effects unit: "1e-2 m" converted unit: "m" (multiply by 1/100)

SWH_Lut_Cor

binary int16 (double)	size: 2
Look-up table correction to significant wave height unit: "1e-2 m" converted unit: "m" (multiply by 1/100)

Sigma0_Raw

binary int16 (double)	size: 2
Backscatter coefficient - raw value unit: "1e-2 dB" converted unit: "dB" (multiply by 1/100)

Std_Sigma0

binary int16 (double)	size: 2
Standard deviation on backscatter coefficient unit: "1e-2 dB" converted unit: "dB" (multiply by 1/100)

Sigma0

binary int16 (double)	size: 2
Backscatter coefficient corrected for instrumental effects unit: "1e-2 dB" converted unit: "dB" (multiply by 1/100)

Sigma0_LUT_Cor

binary int16 (double)	size: 2
Look-up table correction to backscatter coefficient unit: "1e-2 dB" converted unit: "dB" (multiply by 1/100)

Sigma0_Cal_Cor

binary int16 (double)	size: 2
Internal calibration correction to backscatter coefficient unit: "1e-2 dB" converted unit: "dB" (multiply by 1/100)

Sigma0_LW

binary int16 (double)	size: 2
Sigma0 corrected for cloud liquid water path attenuation unit: "1e-2 dB" converted unit: "dB" (multiply by 1/100)

Wind_Sp

binary int16 (double)	size: 2
Wind speed unit: "1e-2 m/s" converted unit: "m/s" (multiply by 1/100)

Wind_Sp_LW

binary int16 (double)	size: 2
Wind speed corrected for cloud liquid water path attenuation unit: "1e-2 m/s" converted unit: "m/s" (multiply by 1/100)

TB_23

binary int16 (double)	size: 2
23.8 GHz brightness temperature unit: "1e-1 K" converted unit: "K" (multiply by 1/10)

TB_36

binary int16 (double)	size: 2
36.5 GHz brightness temperature unit: "1e-1 K" converted unit: "K" (multiply by 1/10)

WV_Cont

binary int16 (double)	size: 2
Water vapour content unit: "1e-2 g/cm2" converted unit: "g/cm2" (multiply by 1/100)

WV_Cont_WS

binary int16 (double)	size: 2
Precise water vapour content (wind speed included) unit: "1e-2 g/cm2" converted unit: "g/cm2" (multiply by 1/100)

LW_Cont

binary int16 (double)	size: 2
Liquid water content unit: "1e-2 kg/cm2" converted unit: "kg/cm2" (multiply by 1/100)

LW_Cont_WS

binary int16 (double)	size: 2
Precise liquid water content (wind speed included) unit: "1e-2 kg/cm2" converted unit: "kg/cm2" (multiply by 1/100)

H_MSS_OSU

binary int32 (double)	size: 4
OSU Mean sea surface height unit: "1e-3 m" converted unit: "m" (multiply by 1/1000)

Square_Off_Nad

binary int32 (double)	size: 4
Waveform-derived square of the off-nadir angle (1-Hz estimate) unit: "1e-6 degrees2" converted unit: "degrees2" (multiply by 1/1000000)

Square_Off_Nad_Smoothed

binary int32 (double)	size: 4
Waveform-derived square of the off-nadir angle (smoothed estimate) unit: "1e-6 degrees2" converted unit: "degrees2" (multiply by 1/1000000)

Spare

binary bytes	size: 4
Spare

hidden: true