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Table 1: The distance to the coast is computed using the theoretical distance to the shore table of the SENTINEL-3 mission.
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Table 2: The orbit parameters (latitude and longitude) are computed, interpolating them at the time of the measurement.
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Table 3: The time-tags of the measurements are the UTC seconds elapsed since 1 January 2000.
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Table 4: The altitude rate of the altimeter measurement is used to determine the closest grid point to the shore table.
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Table 5: The altitude is computed, interpolating it at the time of measurement.
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Table 6: The surface type can be set to open ocean or semi-enclosed seas, enclosed seas or lakes, continental ice or land.
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PARAMETER
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Distance to the coast
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NETCDF NAME
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dist_coast_[x1]_[x2] where:
[x1]: 1 Hz or 20 Hz data rates
[x2]: Ku-band or C-band
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DESCRIPTION
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Distance to the coast at time time_[x1]_[x2]. The distance to the coast is computed using the theoretical distance to the shore table of the SENTINEL-3 mission. The altitude rate of the altimeter measurement is used to determine the closes grid point to the shore table.
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UNITS
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m
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DATA SET AVAILABILITY
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Reduced: 1 Hz only
Standard: 20 Hz Ku-band only
Enhanced: 20 Hz Ku-band only
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OPERATING MODE AVAILABILITY
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LRM and SAR
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DATA ORIGIN
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1 Hz Ku/C-bands: GEN_ENV_DIS_01
20 Hz Ku-band: GEN_ENV_DIS_01
20 Hz C-band: none
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ADDITIONAL INFORMATION
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None |
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PARAMETERS RELATED
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None
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PARAMETER DETAILED DESCRIPTION
|
ESA's Global Land and Ocean Mission for GMES Operational Services
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Table 1. Distance to the coast
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PARAMETER
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Latitude and Longitude
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NETCDF NAME
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lat_[x1]_[x2]
lon_[x1]_[x2]
[x1]: 1 Hz or 20 Hz data rates
[x2]: Ku-band or C-band
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DESCRIPTION
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Latitude position at time time_[x1]_[x2].
Longitude position at time time_[x1]_[x2].
This algorithm uses an ESA library called CFI Software Explorer Orbit that computes both latitude and longitude, interpolating them from the satellite orbit state vector positions file at the precise time of the input measurement.
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UNITS
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10-6 degrees
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DATA SET AVAILABILITY
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Reduced: 1 Hz only
Standard: all
Enhanced: all
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OPERATING MODE AVAILABILITY
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LRM and SAR
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DATA ORIGIN
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1 Hz Ku/C-bands: Orbit CFI algorithm
20 Hz Ku-band: Orbit CFI algorithm
20 Hz C-band: Orbit CFI algorithm
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ADDITIONAL INFORMATION
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Positive latitude is North latitude, negative latitude is South latitude.
East longitude relative to the Greenwich meridian. |
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PARAMETERS RELATED
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None
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PARAMETER DETAILED DESCRIPTION
|
ESA's Global Land and Ocean Mission for GMES Operational Services
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Table 2. Latitude and Longitude
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PARAMETER
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Time-Tag
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NETCDF NAME
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time_[x1]_[x2] where:
[x1]: 1 Hz or 20 Hz data rates
[x2]: Ku-band or C-band
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DESCRIPTION
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Time of the occurrence of the measurement. UTC time elapsed since January 1st 2000. This time has been:
*converted from on-board time counters
*referenced to the overflown surface
*referenced to the middle of the tracking cycle
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UNITS
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seconds
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DATA SET AVAILABILITY
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seconds
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OPERATING MODE AVAILABILITY
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LRM and SAR
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DATA ORIGIN
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1 Hz Ku/C-bands: ALT_MAN_TIM_01 algorithm
20 Hz Ku-band: SRAL Level-1B product
20 Hz C-band: SRAL Level-1B product
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ADDITIONAL INFORMATION
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None |
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PARAMETERS RELATED
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1.UTC days and seconds in the day elapsed since January 1st 2000 (UTC_day_[x1]_[x2] and UTC_sec_[x1]_[x2])
2.Time-tag of the 1 Hz measurement (UTC_time_1hz_[x1]_[x2])
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PARAMETER DETAILED DESCRIPTION
|
ESA's Global Land and Ocean Mission for GMES Operational Services
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Table 3. Time tags
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PARAMETER
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Orbital Altitude Rate
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NETCDF NAME
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orb_alt_rate_[x1]_[x2]
[x1]: 1 Hz or 20 Hz data rates
[x2]: Ku-band or C-band
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DESCRIPTION
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The satellite altitude rate is the height rate of the satellite at time time_[x1]_[x2].
The reference surface for the orbital altitude rate is the combined mean sea surface/geoid surface.
The orbital altitude rate is used to compute the Doppler correction on the altimeter range. This algorithm uses an ESA library called CFI Software Explorer Orbit that computes altitude rate interpolating it from the satellite orbit state vector positions file at the precise time of the input measurement.
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UNITS
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10-2 m/s
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DATA SET AVAILABILITY
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Reduced: none
Standard: all
Enhanced: all
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OPERATING MODE AVAILABILITY
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LRM and SAR
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DATA ORIGIN
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1 Hz Ku/C-bands: Orbit CFI algorithm
20 Hz Ku-band: Orbit CFI algorithm
20 Hz C-band: Orbit CFI algorithm
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ADDITIONAL INFORMATION
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None |
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PARAMETERS RELATED
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None
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PARAMETER DETAILED DESCRIPTION
|
ESA's Global Land and Ocean Mission for GMES Operational Services
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Table 4. Orbit
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PARAMETER
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Orbit altitude
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NETCDF NAME
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alt_[x1]_[x2]
[x1]: 1 Hz or 20 Hz data rates
[x2]: Ku-band or C-band
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DESCRIPTION
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The satellite altitude is the height of the satellite above the reference ellipsoid at time time_[x1]_[x2]. This algorithm uses an ESA library called CFI Software Explorer Orbit that computes altitude interpolating them from the satellite orbit state vector positions file at the precise time of the input measurement.
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UNITS
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10-4 m. An offset of 700 000 m to be added to the value read from the netCDF file.
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DATA SET AVAILABILITY
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Reduced: 1 Hz only
Standard: all
Enhanced: all
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OPERATING MODE AVAILABILITY
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LRM and SAR
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DATA ORIGIN
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1 Hz Ku/C-bands:Orbit CFI algorithm
20 Hz Ku-band: Orbit CFI algorithm
20 Hz C-band: Orbit CFI algorithm
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ADDITIONAL INFORMATION
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For further information about orbit CFI, CFI Website |
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PARAMETERS RELATED
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None
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PARAMETER DETAILED DESCRIPTION
|
ESA's Global Land and Ocean Mission for GMES Operational Services
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Table 5. Altitude
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PARAMETER
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Surface types
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NETCDF NAME
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surf_type_[x1]_[x2] where:
[x1]: 1 Hz or 20 Hz data rates
[x2]: Ku-band or C-band
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DESCRIPTION
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Surface type at time time_[x1]_[x2]. Surface type is computed using the land/sea mask of the SENTINEL-3 mission. The latitude and longitude of the altimeter measurement are used to determine the nearest grid point in the land/sea mask file. The surface type is set to the surface type reported for this nearest grid point.
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UNITS
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The possible surface types are:
open ocean or semi-enclosed seas (0b)
enclosed seas or lakes (1b)
continental ice (2b)
land (3b)
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DATA SET AVAILABILITY
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Reduced: 1 Hz only
Standard: 1 Hz only
Enhanced: 1 Hz only
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OPERATING MODE AVAILABILITY
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LRM and SAR
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DATA ORIGIN
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1 Hz Ku/C-bands: SRAL Level-1B product
20 Hz-Ku-band: SRAL Level-1B product
20 Hz C-band: SRAL Level-1B product
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ADDITIONAL INFORMATION
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None |
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PARAMETERS RELATED
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Radiometer-derived surface type (rad_surf_type[x1]_[x2]): The algorithm that computes the radiometer-derived surface type is RAD_MAN_INT_03. This algorithm averages/interpolates the radiometer data at 7 Hz to the 1 Hz altimeter time tags.
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PARAMETER DETAILED DESCRIPTION
|
ESA's Global Land and Ocean Mission for GMES Operational Services
|
Table 6. Surface type
Time Tags, Locations and Surface Type
