| Mission | Sentinel-6A (LR) |
| MVA-Name | sentinel6a_LR_NTC_F08_hf |
| Source | NTC/F08 |
| Frequency | 20 |
doppler.00
| Pos | Size | Scaling | Unit | Name | Version Specific Description |
|---|---|---|---|---|---|
| 1 | 2 | -3 | m | doppler | Doppler Correction
One-way Doppler range correction due to satellite altitude rate applied to calibrated tracker range. Source: NTC/F08 Original-Parameter: data_20/ku/range_cor_doppler |
ebias.00
| Pos | Size | Scaling | Unit | Name | Version Specific Description |
|---|---|---|---|---|---|
| 1 | 2 | -3 | m | emb | Sea State Bias
Sea state bias correction derived from Ku-band. A sea state bias correction must be added (negative value) to the instrument range measurement to correct it for sea state bias delays of the radar pulse Source: NTC/F08 Original-Parameter: data_01/ku/sea_state_bias |
instr.00
| Pos | Size | Scaling | Unit | Name | Version Specific Description |
|---|---|---|---|---|---|
| 1 | +4 | - | sec | isec | Integer Seconds Elapsed Since Epoch
It contains the seconds since 1 Jan 2000 00:00:00. Time is in UTC. Time refers to the instant the L1B waveform (which is a combination of echoes for both LR and HR) touches the surface. Whenever a leap second occurs, the attribute leap_second will be set to the appropriate value Source: NTC/F08 Original-Parameter: data_20/ku/time |
| 2 | +4 | -6 | sec | msec | Microseconds, Fractional Part of isec
It contains the seconds since 1 Jan 2000 00:00:00. Time is in UTC. Time refers to the instant the L1B waveform (which is a combination of echoes for both LR and HR) touches the surface. Whenever a leap second occurs, the attribute leap_second will be set to the appropriate value Source: NTC/F08 Original-Parameter: data_20/ku/time |
| 3 | +4 | -3 | m | ralt | Altimeter Range
Range computed from the ocean retracker. It includes all instrumental corrections from net_instr_cor_range_ocean Source: NTC/F08 Original-Parameter: data_20/ku/range_ocean |
| 4 | +2 | -3 | m | stdalt | RMS of Altimeter Range
n.a. |
| 5 | 2 | -2 | m | swh | Significant Wave Height
SWH computed from the ocean retracker. It includes all instrumental corrections from net_instr_cor_swh_ocean Source: NTC/F08 Original-Parameter: data_20/ku/swh_ocean |
| 6 | +2 | -2 | m | stdswh | RMS of Significant Wave Height
n.a. |
| 7 | +2 | -2 | db | sigma0 | Backscatter Coefficient
Backscatter coefficient computed from the ocean retracker. It includes all instrumental corrections from net_instr_cor_sig0_ocean and sig0_scaling_factor as well as the atmospheric attenuation correction. Source: NTC/F08 Original-Parameter: data_20/ku/sig0_ocean |
| 8 | +1 | -1 | m/s | windsp | Wind Speed
n.a. |
| 9 | +1 | - | - | iflags | Instrument Status and Quality Flags
Source: NTC/F08 Original-Parameter: data_20/ku/swh_ocean, data_20/ku/range_ocean Flags: 2: swh_ocean in [0,32767] 128 : range_ocean = nan |
instr.01
| Pos | Size | Scaling | Unit | Name | Version Specific Description |
|---|---|---|---|---|---|
| 1 | +4 | - | sec | isec | Integer Seconds Elapsed Since Epoch
It contains the seconds since 1 Jan 2000 00:00:00. Time is in UTC. Time refers to the instant the L1B waveform (which is a combination of echoes for both LR and HR) touches the surface. Whenever a leap second occurs, the attribute leap_second will be set to the appropriate value Source: NTC/F08 Original-Parameter: data_20/ku/time |
| 2 | +4 | -6 | sec | msec | Microseconds, Fractional Part of isec
It contains the seconds since 1 Jan 2000 00:00:00. Time is in UTC. Time refers to the instant the L1B waveform (which is a combination of echoes for both LR and HR) touches the surface. Whenever a leap second occurs, the attribute leap_second will be set to the appropriate value Source: NTC/F08 Original-Parameter: data_20/ku/time |
| 3 | +4 | -3 | m | ralt | Altimeter Range
Corrected OCOG altimeter range. This includes the instrumental corrections in tracker_range_calibrated. Source: NTC/F08 Original-Parameter: data_20/ku/range_ocog |
| 4 | +2 | -3 | m | stdalt | RMS of Altimeter Range
n.a. |
| 5 | 2 | -2 | m | swh | Significant Wave Height
n.a. |
| 6 | +2 | -2 | m | stdswh | RMS of Significant Wave Height
n.a. |
| 7 | +2 | -2 | db | sigma0 | Backscatter Coefficient
Backscatter coefficient computed from OCOG retracking. It includes all calibrated instrument gains from L1B power_scaling_to_antenna plus geometry and antenna gain from sig0_scaling_factor Source: NTC/F08 Original-Parameter: data_20/ku/sig0_ocog |
| 8 | +1 | -1 | m/s | windsp | Wind Speed
n.a. |
| 9 | +1 | - | - | iflags | Instrument Status and Quality Flags
Source: NTC/F08 Original-Parameter: data_20/ku/swh_ocean, data_20/ku/range_ocean Flags: 2: swh_ocean in [0,32767] 128 : range_ocean = nan |
ionos.00
| Pos | Size | Scaling | Unit | Name | Version Specific Description |
|---|---|---|---|---|---|
| 1 | 2 | -3 | m | ionos | Ionospheric correction
Ionospheric correction derived from the LR altimeter measurements and valid over ocean and lake surfaces only. A ionospheric correction must be added (negative value) to the instrument range measurement to correct it for the ionospheric delays of the radar pulse Source: NTC/F08 Original-Parameter: data_01/iono_cor_alt |
ionos.01
| Pos | Size | Scaling | Unit | Name | Version Specific Description |
|---|---|---|---|---|---|
| 1 | 2 | -3 | m | ionos | Ionospheric correction
GIM ionospheric correction, computed from GPS ionospheric data. A ionospheric correction must be added (negative value) to the instrument range measurement to correct it for the ionospheric delays of the radar pulse Source: NTC/F08 Original-Parameter: data_01/ku/iono_cor_gim |
ionos.02
| Pos | Size | Scaling | Unit | Name | Version Specific Description |
|---|---|---|---|---|---|
| 1 | 2 | -3 | m | ionos | Ionospheric correction
Smoothed ionospheric correction derived from the LR altimeter measurements and valid over ocean and lake surfaces only, using an iterative process based on median and Lanczos filtering. A ionospheric correction must be added (negative value) to the instrument range measurement to correct it for the ionospheric delays of the radar pulse Source: NTC/F08 Original-Parameter: data_01/iono_cor_alt_filtered |
orbit.00
| Pos | Size | Scaling | Unit | Name | Version Specific Description |
|---|---|---|---|---|---|
| 1 | +4 | -6 | deg | glon | Longitude
Longitude of measurement [0, 360). East longitude relative to Greenwich meridian Source: NTC/F08 Original-Parameter: data_20/ku/longitude |
| 2 | 4 | -6 | deg | glat | Latitude
Latitude of measurement [-90, +90]. Positive latitude is North latitude, negative latitude is South latitude Source: NTC/F08 Original-Parameter: data_20/ku/latitude |
| 3 | +4 | -3 | m | hsat | Satellite Altitude
Altitude of the satellite center of mass above the reference ellipsoid (WGS84). Source: NTC/F08 Original-Parameter: data_20/ku/altitude |
| 4 | +1 | - | - | oflags | Orbit Status and Quality Flags
Source: NTC/F08 Original-Parameter: data_20/ku/surface_classification_flag, data_20/ku/altitude Flags: 16 : surface_classification_flag != 0 128 altitude == nan |
sig0_scaling.00
| Pos | Size | Scaling | Unit | Name | Version Specific Description |
|---|---|---|---|---|---|
| 1 | 2 | -2 | db | sig0_scaling | Sigm0 Scaling Factor
The scaling factor in order to retrieve sigma-0 from L1B waveform. It includes the antenna gains and all the geometry factors satellite-surface, according to the radar equation. It is not applied to the l1b waveforms. It has to be applied to the re-tracked value of the (power_waveform*waveform_scale_factor) Source: NTC/F08 Original-Parameter: data_20/ku/sig0_scaling_factor |
tropd.00
| Pos | Size | Scaling | Unit | Name | Version Specific Description |
|---|---|---|---|---|---|
| 1 | 2 | -3 | m | dtrop | Dry Tropospheric Correction
Dry troposphere correction. Computed from 3d meteorological fields at measurement altitude, at the altimeter time-tag from the interpolation of 2 meteorological fields that surround the altimeter time-tag. A dry tropospheric correction must be added (negative value) to the instrument range measurement to correct it for the dry tropospheric delay of the radar pulse Source: NTC/F08 Original-Parameter: data_01/model_dry_tropo_cor_measurement_altitude |
tropw.00
| Pos | Size | Scaling | Unit | Name | Version Specific Description |
|---|---|---|---|---|---|
| 1 | 2 | -3 | m | wtrop | Wet Tropospheric Correction
Wet tropospheric correction derived from the on-board radiometer and valid over ocean surfaces only. A wet tropospheric correction must be added (negative value) to the instrument range measurement to correct it for the wet tropospheric delays of the radar pulse. Computed from a combination of AMR and HRMR measurements. Source: NTC/F08 Original-Parameter: data_01/rad_wet_tropo_cor |
tropw.01
| Pos | Size | Scaling | Unit | Name | Version Specific Description |
|---|---|---|---|---|---|
| 1 | 2 | -3 | m | wtrop | Wet Tropospheric Correction
Wet troposphere correction. Computed from 3d meteorological fields at measurement altitude, at the altimeter time-tag from the interpolation of 2 meteorological fields that surround the altimeter time-tag. A wet tropospheric correction must be added (negative value) to the instrument range measurement to correct it for the wet tropospheric delays of the radar pulse Source: NTC/F08 Original-Parameter: data_01/model_wet_tropo_cor_measurement_altitude |
uralt.00
| Pos | Size | Scaling | Unit | Name | Version Specific Description |
|---|---|---|---|---|---|
| 1 | +4 | -3 | m | uralt | Tracker Range
This is the 1-way distance from the satellite`s center of mass to the middle of the range window (sample ns/2 from 0). It includes the following range calibrations: (a) range_corr_internal_delay_cal, (b) range_corr_internal_delay_diff, (c) range_corr_external_group_delay, (d) range_corr_com. Note: the actual altimeter clock (variable `altimeter_clock_ku`) has been used to compute the altimeter range Source: NTC/F08 Original-Parameter: data_20/ku/tracker_range_calibrated |
waveform_power_scaling.00
| Pos | Size | Scaling | Unit | Name | Version Specific Description |
|---|---|---|---|---|---|
| 1 | 2 | -24 | db | scale_power | Waveform Scaling Factor for Ku-Band Backscatter Coefficient
The L1B waveform scaling factor, computed in order to best fit each waveform within 2 bytes. The scaling, needed to convert the L1B waveform into Watt, is applied as follows: power_waveform_watt(time, ns) = power_waveform(time, ns) * waveform_scale_factor(time) Source: NTC/F08 Original-Parameter: data_20/ku/waveform_scale_factor |