SIR_L2_MDSR_v1

binary record ""

size: 1392

SIRAL L2 measurement data set record

field name

definition

mdsr_time

binary time

size: 12

Data record time (MDSR time stamp)

unit: "s since 2000-01-01"

value: float(./days) * 86400 + float(./seconds) + float(./microseconds) / 1000000

binary record size: 12

ENVISAT binary datetime

id field name definition

0 days

binary int32 size: 4

days since January 1st, 2000 (may be negative)

unit: "days since 2000-01-01"

1 seconds

binary uint32 size: 4

seconds since start of day

unit: "s"

2 microseconds

binary uint32 size: 4

microseconds since start of second

unit: "1e-6 s"

meas_mode_flags

binary array[20]

size: 7:4

Measurement mode flags

binary uint8 size: 0:3

Measurement mode flag: 0 = other mode (e.g. calibration, acquisition), 1 = LRM, 2 = SAR, 3 = SARin, 4 = SID (SARin degraded case)

instr_id

binary uint8	size: 0:1
SIRAL identifier: 0 = Nominal, 1 = Redundant

spare_1

binary bytes	size: 0:3
padding

hidden: true

lat

binary int32 (double)	size: 4
Latitude of orbit in WSG84 (corresponds to the nadir position at the time of the 1Hz timestamp) unit: "1e-7 degrees_north" converted unit: "degrees_north" (multiply by 1/10000000)

lon

binary int32 (double)	size: 4
Longitude of orbit in WSG84 (corresponds to the nadir position at the time of the 1Hz timestamp) unit: "1e-7 degrees_east" converted unit: "degrees_east" (multiply by 1/10000000)

alt_cog_ref_ellip

binary int32	size: 4
Altitude of CoG above reference ellipsoid at nadir (interpolated value) unit: "mm"

spacecraft_roll

binary int32 (double)	size: 4
Spacecraft Roll unit: "1e-7 degrees" converted unit: "degrees" (multiply by 1/10000000)

spacecraft_pitch

binary int32 (double)	size: 4
Spacecraft Pitch unit: "1e-7 degrees" converted unit: "degrees" (multiply by 1/10000000)

spacecraft_yaw

binary int32 (double)	size: 4
Spacecraft Yaw unit: "1e-7 degrees" converted unit: "degrees" (multiply by 1/10000000)

spare_2

binary bytes	size: 2
spare (for word alignment)

hidden: true

num_valid_meas

binary uint16	size: 2
Number of valid measurements in the record (normally 20, but may be less at the end of a data segment)

dry_tropo_corr

binary int16	size: 2
Dry tropospheric correction unit: "mm"

wet_tropo_corr

binary int16	size: 2
Wet tropospheric correction unit: "mm"

inv_barom_corr

binary int16	size: 2
Inverse barometric correction unit: "mm"

dyn_atm_corr

binary int16	size: 2
Dynamic atmospheric correction (from Mog2d) unit: "mm"

ion_corr

binary int16	size: 2
Ionospheric correction unit: "mm"

sea_state_bias_corr

binary int16	size: 2
Sea state bias correction (EM bias) unit: "mm"

elast_ocean_tide

binary int16	size: 2
Elastic ocean tide unit: "mm"

lp_ocean_tide

binary int16	size: 2
Long period ocean tide unit: "mm"

ocean_load_tide

binary int16	size: 2
Ocean loading tide unit: "mm"

sol_earth_tide

binary int16	size: 2
Solid earth tide unit: "mm"

geocen_pol_tide

binary int16	size: 2
Geocentric polar tide unit: "mm"

spare_3

binary bytes	size: 2
spare (for word alignment)

hidden: true

surf_type_flags

binary array[20]

size: 7:4

Surface type flags

binary uint8 size: 0:3

Surface type flag: 0 = open ocean, 1 = closed sea, 2 = continental ice, 3 = land, 4-7 = currently unused

spare_4

binary bytes	size: 0:4
padding

hidden: true

mss_geoid_ht

binary int32	size: 4
Mean sea surface / geoid from model (over ocean (surface type 0 or 1) this field is set to the MSS height, over land (surface type 2 or 3) it is set to the geoid height) unit: "mm"

depth_elev_model

binary int32	size: 4
Ocean depth / land elevation from model unit: "mm"

ice_conc

binary int16 (double)	size: 2
Ice concentration unit: "1e-2 %" converted unit: "%" (multiply by 1/100)

snow_depth

binary int16	size: 2
Snow depth unit: "mm"

snow_density

binary int16	size: 2
Snow density unit: "kg/m3"

spare_5

binary bytes	size: 2
spare (for word alignment)

hidden: true

corr_stat_flags

binary record

size: 4

Correction status flags: shows the validity of 1Hz corrections that have been used to derive the surface height.

field name

definition

dry_tropo_corr_stat

binary uint8	size: 0:1
Dry tropospheric delay correction status: 0 = OK, 1 = invalid

wet_tropo_corr_stat

binary uint8	size: 0:1
Wet tropospheric delay correction status: 0 = OK, 1 = invalid

inv_barom_corr_stat

binary uint8	size: 0:1
Inverse barometric correction status: 0 = OK, 1 = invalid

dyn_atm_corr_stat

binary uint8	size: 0:1
Dynamic atmospheric correction status: 0 = OK, 1 = invalid

ion_gim_corr_stat

binary uint8	size: 0:1
GIM Ionospheric correction status: 0 = OK, 1 = invalid

ion_mdl_corr_stat

binary uint8	size: 0:1
Model Ionosphere correction status: 0 = OK, 1 = invalid

ocean_tide_stat

binary uint8	size: 0:1
Ocean tide status: 0 = OK, 1 = invalid

lp_ocean_tide_stat

binary uint8	size: 0:1
Long period equilibrium ocean tide status: 0 = OK, 1 = invalid

ocean_load_tide_stat

binary uint8	size: 0:1
Ocean loading tide status: 0 = OK, 1 = invalid

sol_earth_tide_stat

binary uint8	size: 0:1
Solid earth tide status: 0 = OK, 1 = invalid

geocen_pol_tide_stat

binary uint8	size: 0:1
Geocentric polar tide status: 0 = OK, 1 = invalid

surf_type_stat

binary uint8	size: 0:1
Surface type status: 0 = OK, 1 = invalid

ice_conc_mdl_stat

binary uint8	size: 0:1
Ice concentration model status: 0 = OK, 1 = invalid

snow_depth_mdl_stat

binary uint8	size: 0:1
Snow depth model status: 0 = OK, 1 = invalid

snow_density_mdl_stat

binary uint8	size: 0:1
Snow density model status: 0 = OK, 1 = invalid

mss_mdl_stat

binary uint8	size: 0:1
Mean Sea Surface model status: 0 = OK, 1 = invalid

geoid_mdl_stat

binary uint8	size: 0:1
Geoid model status: 0 = OK, 1 = invalid

odle_model_stat

binary uint8	size: 0:1
ODLE from model status: 0 = OK, 1 = invalid

dem_mdl_stat

binary uint8	size: 0:1
DEM model status: 0 = OK, 1 = invalid

slp_mdl_stat

binary uint8	size: 0:1
Slope model status: 0 = OK, 1 = invalid

ssb_mdl_stat

binary uint8	size: 0:1
Sea-state bias model status: 0 = OK, 1 = invalid

swh_stat

binary uint8	size: 0:1
Significant Wave Height status: 0 = OK, 1 = invalid

wind_spd_stat

binary uint8	size: 0:1
Altimeter Wind Speed status: 0 = OK, 1 = invalid

spare

binary bytes	size: 1:1
padding

hidden: true

swh

binary int16	size: 2
Significant Wave Height unit: "mm"

wind_spd

binary uint16	size: 2
Wind speed unit: "mm/s"

spare_6

binary bytes	size: 8
spare

hidden: true

meas_data

binary array[20]

size: 1280

Measurement data

binary record size: 64

SIRAL L2 measurement

id field name definition

0 delta_time

binary int32 (double) size: 4

Delta time (to give 20Hz times)

unit: "1e-6 s"

converted unit: "s" (multiply by 1/1000000)

1 lat

binary int32 (double) size: 4

Latitude of measurement (i.e. of the echoing point position)

unit: "1e-7 degrees_north"

converted unit: "degrees_north" (multiply by 1/10000000)

2 lon

binary int32 (double) size: 4

Longitude of measurement (i.e. of the echoing point position)

unit: "1e-7 degrees_east"

converted unit: "degrees_east" (multiply by 1/10000000)

3 surf_height_trkr_1

binary int32 size: 4

Height of surface w.r.t reference ellipsoid (retracker 1)

unit: "mm"

4 surf_height_trkr_2

binary int32 size: 4

Height of surface w.r.t reference ellipsoid (retracker 2)

unit: "mm"

5 surf_height_trkr_3

binary int32 size: 4

Height of surface w.r.t reference ellipsoid (retracker 3)

unit: "mm"

6 sig_0_trkr_1

binary int32 (double) size: 2

Backscatter (sigma-zero) (retracker 1)

unit: "1e-2 dB"

converted unit: "dB" (multiply by 1/100)

7 sig_0_trkr_2

binary int16 (double) size: 2

Backscatter (sigma-zero) (retracker 2)

unit: "1e-2 dB"

converted unit: "dB" (multiply by 1/100)

8 sig_0_trkr_3

binary int16 (double) size: 2

Backscatter (sigma-zero) (retracker 3)

unit: "1e-2 dB"

converted unit: "dB" (multiply by 1/100)

9 freeb

binary int16 size: 2

Freeboard

unit: "mm"

10 surf_ht_anom

binary int16 size: 2

Interpolated sea surface height anomaly

unit: "mm"

11 num_intp_rec_sha

binary int16 size: 2

Number of interpolated records for SHA

12 sha_intp_qual

binary int16 size: 2

SSHA interpolation quality

unit: "mm"

13 peakiness

binary uint16 (double) size: 2

Peakiness

converted unit: "" (multiply by 1/100)

14 num_avg

binary uint16 size: 2

Number of echoes or beams averaged

15 spare_1

binary bytes size: 2

spare

hidden: true

16 meas_qual_flags

binary record size: 4

Measurement quality flags: indicate the quality of the 20Hz measurement parameters

id field name definition

0 rec_degr

binary uint8 size: 0:1

Record degraded: 0 = OK, 1 = degraded or zero-filled for padding (if set to 1, block should not be processed)

1 orbit_err

binary uint8 size: 0:1

Orbit error: 0 = OK, 1 = error

2 orbit_discnt

binary uint8 size: 0:1

Orbit discontinuity: 0 = OK, 1 = orbit discontinuity occurred (e.g. gap)

3 height_err_1

binary uint8 size: 0:1

Height error 1: 0 = OK, 1 = error in height derivation for retracker 1

4 height_err_2

binary uint8 size: 0:1

Height error 1: 0 = OK, 1 = error in height derivation for retracker 2

5 height_err_3

binary uint8 size: 0:1

Height error 1: 0 = OK, 1 = error in height derivation for retracker 3

6 bkscat_err_1

binary uint8 size: 0:1

Height error 1: 0 = OK, 1 = error in the backscatter derivation for retracker 1

7 bkscat_err_2

binary uint8 size: 0:1

Height error 1: 0 = OK, 1 = error in the backscatter derivation for retracker 2

8 bkscat_err_3

binary uint8 size: 0:1

Height error 1: 0 = OK, 1 = error in the backscatter derivation for retracker 3

9 ssha_intp_err

binary uint8 size: 0:1

SSHA interpolation error: 0 = no, 1 = error

10 peakiness_err

binary uint8 size: 0:1

Peakiness error: 0 = no, 1 = error

11 freeb_err

binary uint8 size: 0:1

Freeboard error: 0 = OK, 1 = invalid

12 discr_ocean

binary uint8 size: 0:1

SARin discriminator = ocean: 0 = no, 1 = yes

13 discr_lead

binary uint8 size: 0:1

SARin discriminator = lead: 0 = no, 1 = yes

14 discr_ice

binary uint8 size: 0:1

SARin discriminator = ice: 0 = no, 1 = yes

15 discr_unknown

binary uint8 size: 0:1

SARin discriminator = unknown: 0 = no, 1 = yes

16 xtrack_err

binary uint8 size: 0:1

SARin x-track angle error: 0 = no, 1 = ambiguous angle

17 rx_ch1_err

binary uint8 size: 0:1

Receive chain 1 error for SARin: 0 = OK, 1 = degraded or missing

18 rx_ch2_err

binary uint8 size: 0:1

Receive chain 2 error for SARin: 0 = OK, 1 = degraded or missing

19 instr_flag

binary uint8 size: 0:1

Siral identifier: 0 = Nominal, 1 = Redundant

20 surf_model

binary uint8 size: 0:1

Surface model available: 0 = OK, 1 = no DEM/SLOPE model for location

21 misp_err

binary uint8 size: 0:1

Mispointing error: 0 = OK, 1 = error during calculation

22 dt_err

binary uint8 size: 0:1

Delta time error: 0 = OK, 1 = error during calculation

23 lrm_slp_mdl_valid

binary uint8 size: 0:1

LRM slope model data valid: 0 = slope model valid, 1 = no valid model available

24 sarin_basel

binary uint8 size: 0:1

SARin baseline state: 0 = baseline OK, 1 = baseline error

25 sarin_oor

binary uint8 size: 0:1

SARin out of range: 0 = computed range OK, 1 = computed range outside of threshold

26 sarin_bad_vel

binary uint8 size: 0:1

SARin bad velocity: 0 = velocity OK, 1 = velocity out of range

27 cal_warn

binary uint8 size: 0:1

Calibration warning: 0 = no warning, 1 = non-nominal calibration applied

28 spare

binary bytes size: 0:4

padding

hidden: true

17 corr_appl_flags

binary record size: 4

Correction Application Flags

id field name definition

0 corr_int_cal

binary uint8 size: 0:1

Corrected for internal calibration: 0 = no, 1 = yes

1 corr_rad_dopp

binary uint8 size: 0:1

Corrected for radial doppler: 0 = no, 1 = yes

2 corr_dry_tropo

binary uint8 size: 0:1

Corrected for dry troposphere: 0 = no, 1 = yes

3 corr_wet_tropo

binary uint8 size: 0:1

Corrected for wet troposphere: 0 = no, 1 = yes

4 corr_inv_barom

binary uint8 size: 0:1

Corrected for inverse barometer: 0 = no, 1 = yes

5 corr_high_freq_var

binary uint8 size: 0:1

Corrected for high frequency variability (Dynamic Atmospheric Correction): 0 = no, 1 = yes

6 corr_ion_gim

binary uint8 size: 0:1

Corrected for ionosphere (GIM): 0 = no, 1 = yes

7 corr_ion_mdl

binary uint8 size: 0:1

Corrected for ionosphere (model): 0 = no, 1 = yes

8 corr_ocean_tide

binary uint8 size: 0:1

Corrected for Ocean tide: 0 = no, 1 = yes

9 corr_lp_ocean_tide

binary uint8 size: 0:1

Corrected for Long period equilibrium ocean tide: 0 = no, 1 = yes

10 corr_ocean_load_tide

binary uint8 size: 0:1

Corrected for Ocean loading tide: 0 = no, 1 = yes

11 corr_sol_earth_tide

binary uint8 size: 0:1

Corrected for Solid earth tide: 0 = no, 1 = yes

12 corr_geocen_pol_tide

binary uint8 size: 0:1

Corrected for Geocentric Polar tide: 0 = no, 1 = yes

13 corr_slp_dopp

binary uint8 size: 0:1

Corrected for Slope Doppler correction: 0 = no, 1 = yes

14 spec_win_offs_app

binary uint8 size: 0:1

Mode specific window offset applied: 0 = no, 1 = yes

15 sar_retrkr_app

binary uint8 size: 0:1

SAR retracker applied: 0 = no, 1 = yes

16 sarin_retrkr_app

binary uint8 size: 0:1

SARin retracker applied: 0 = no, 1 = yes

17 lrm_retrkr_app

binary uint8 size: 0:1

LRM retracker applied: 0 = no, 1 = yes

18 lrm_ocean_bias_app

binary uint8 size: 0:1

LRM ocean bias applied: 0 = no, 1 = yes

19 lrm_ice_bias_app

binary uint8 size: 0:1

LRM ice bias applied: 0 = no, 1 = yes

20 sar_ocean_bias_app

binary uint8 size: 0:1

SAR ocean bias applied: 0 = no, 1 = yes

21 sar_ice_bias_app

binary uint8 size: 0:1

SAR ice bias applied: 0 = no, 1 = yes

22 sarin_ocean_bias_app

binary uint8 size: 0:1

SARin ocean bias applied: 0 = no, 1 = yes

23 sarin_ice_bias_app

binary uint8 size: 0:1

SARin ice bias applied: 0 = no, 1 = yes

24 lrm_slp_mdl_valid

binary uint8 size: 0:1

LRM slope model data valid: 0 = no, 1 = yes

25 sarin_basel

binary uint8 size: 0:1

SARin bad baseline: 0 = no, 1 = yes

26 sarin_oor

binary uint8 size: 0:1

SARin out of range: 0 = no, 1 = yes

27 sarin_bad_vel

binary uint8 size: 0:1

SARin bad velocity: 0 = no, 1 = yes

28 ssb_used

binary uint8 size: 0:1

Sea-state bias used: 0 = no, 1 = yes

29 spare

binary bytes size: 0:2

padding

hidden: true

30 failure

binary uint8 size: 0:1

Master Failure flag: 0 = OK, 1 = Height not fully corrected

18 trkr_1_quality

binary uint32 size: 4

Retracker 1 Quality value

19 trkr_2_quality

binary uint32 size: 4

Retracker 2 Quality value

20 trkr_3_quality

binary uint32 size: 4

Retracker 3 Quality value