Skip to main content

Description

Interferograms for each of the 9 Doppler beams formed and spatially averaged (low rate) by the On Board Processor, corrected on the ground for phase biases (inherent to the processing applied on board). The geometry of the measurements is also reported for use in subsequent processing. Gridded; full swath for each half orbit. Available in netCDF-4 file format.<br>
Please note that this collection contains SWOT Version C science data products.

Product Summary

Platforms
SWOT
Instruments
KaRIn ,
Jason-class Altimeter ,
AMR ,
DORIS ,
GPSP ,
LRA
Spatial Extent

N: 90 S: -90 E: 180 W: -180

Geographic Region
GLOBAL
Coordinate System
CARTESIAN
Granule Spatial Representation
GEODETIC
Temporal Extent
2022-12-16
Data Partner
Physical Oceanography Distributed Active Archive Center, Jet Propulsion Laboratory, NASA (NASA/JPL/PODAAC)
Concept ID
C2799438202-POCLOUD
Data State
SUPERSEDED
Number of Files/Granules
22988
Processing Level
1B
Published
Updated
Science Keywords
SIGMA NAUGHT ,
PHASE AND AMPLITUDE ,
Radar Backscatter ,
Radar Cross-Section

Citation

Citation is critically important for dataset documentation and discovery. This dataset is openly shared, without restriction, in accordance with the EOSDIS Data Use and Citation Guidance.

Copy Citation

SWOT. (2024). SWOT Level 1B Low-Rate Interferogram Data Product [Data set]. NASA Physical Oceanography Distributed Active Archive Center. https://doi.org/10.5067/SWOT-INTF-2.0 Date Accessed: 2025-12-10

Documents

Variables

Variables are a set of physical properties whose values determine the characteristics or behavior of something. For example, temperature and pressure are variables of the atmosphere. Parameters and variables can be used interchangeably. Variable level attributes provide individual information for each variable.

The Name in this table is the variable name. Fill value indicates missing or undefined data points in a variable. Valid range is the range of values the variable can store. Scale factor is used to increase or decrease the size of an object and can be used to correct for distortion. For questions on a specific variable, please use the Earthdata Forum.

Name Description Units Data Type Fill Value Valid Range Scale Factor
/left/angular_correlation Angular correlation. 1 float 9.96921E+36 0 to 2 1
/left/doppler_centroid On-board processor Doppler value. 1/s float 9.96921E+36 -1000000 to 1000000 1
/left/doppler_miti Uncalibrated, complex Doppler image (mitigation field). The complex value is computed by spatially averaging pulse-pair conjugate product values after range compression. Positive phase implies increasing range. 1 int 2147483647 -8388608 to 8388607 1
/left/geometric_correlation Geometric correlation. 1 float 9.96921E+36 0 to 2 1
/left/interferogram Complex interferogram. The real and imaginary parts are in the complex_depth array dimension. The magnitude of the interferogram represents the total interferometric correlation. 1 float 9.96921E+36 -1 to 1 1
/left/interferogram_qual Quality flag. N/A uint 4294967295 0 to 3255140359 1
/left/iono_cor_gim_ka Equivalent vertical correction due to ionosphere delay. The reported pixel height, latitude and longitude are computed after adding negative media corrections to uncorrected range along slant-range paths, accounting for the differential delay between the two KaRIn antennas. The equivalent vertical correction is computed by applying obliquity factors to the slant-path correction. Adding the reported correction to the reported pixel height results in the uncorrected pixel height. m float 9.96921E+36 -0.5 0 1
/left/model_dry_tropo_cor Equivalent vertical correction due to dry troposphere delay. The reported pixel height, latitude and longitude are computed after adding negative media corrections to uncorrected range along slant-range paths, accounting for the differential delay between the two KaRIn antennas. The equivalent vertical correction is computed by applying obliquity factors to the slant-path correction. Adding the reported correction to the reported pixel height results in the uncorrected pixel height. m float 9.96921E+36 -3 to -1.5 1
/left/model_wet_tropo_cor Equivalent vertical correction due to wet troposphere delay. The reported pixel height, latitude and longitude are computed after adding negative media corrections to uncorrected range along slant-range paths, accounting for the differential delay between the two KaRIn antennas. The equivalent vertical correction is computed by applying obliquity factors to the slant-path correction. Adding the reported correction to the reported pixel height results in the uncorrected pixel height. m float 9.96921E+36 -1 0 1
/left/noise_correlation Noise correlation. 1 float 9.96921E+36 0 to 2 1
/left/noise_power_minus_y noise power for minus y channel in linear unis. 1 float 9.96921E+36 0 to 1.0E+20 1
/left/noise_power_plus_y Noise power for plus_y channel in linear units. 1 float 9.96921E+36 0 to 1.0E+20 1
/left/num_looks Effective number of independent looks. 1 float 9.96921E+36 0 to 5000 1
/left/obp_ref_surface On-board processor reference surface height relative to the reference ellipsoid. m float 9.96921E+36 -1500 to 15000 1
/left/phase_bias_cor Total phase bias correction. rad float 9.96921E+36 -3.1415927 to 3.1415927 1
/left/phase_uncert 1-sigma uncertainty computed analytically using observed correlation and effective number of looks. Two-sided error bars (phase-phase_uncert,phase+phase_uncert) include approximately 68% of probability distribution. rad float 9.96921E+36 0 to 100 1
/left/power_miti Uncalibrated center-beam power averaged to 250 m resolution (mitigation field). 1 int 2147483647 0 to 16777215 1
/left/power_squared_miti Uncalibrated center-beam power squared averaged to 250 m resolution (mitigation field). The value should be scaled by a factor of 2304 in order to be compared to the square of the 250 m power (power_miti). 1 int 2147483647 0 to 16777215 1
/left/pulse_repetition_interval KaRIn pulse repetition interval (per side). s float 9.96921E+36 0.00021 to 0.00024 1
/left/reference_latitude Latitude of the location on the Earth surface, defined by a reference surface, to which the measured phase is referred. Positive latitude is North latitude, negative latitude is South latitude. degrees_north int 2147483647 -80000000 to 80000000 1.0E-6
/left/reference_location Location on the Earth surface, defined by a reference surface, to which the measured phase is referred. The location is given in ECEF coordinates with the X, Y, and Z components given in the coord array dimension. m double 9.9692099683869E+36 -10000000 to 10000000 1
/left/reference_longitude Longitude of the location on the Earth surface, defined by a reference surface, to which the measured phase is referred. East longitude relative to Greenwich meridian. degrees_east int 2147483647 0 to 359999999 1.0E-6
/left/sig0 Normalized radar cross section in linear units (not decibels). 1 float 9.96921E+36 -1000 to 10000000 1
/left/sig0_cor_atmos_model Atmospheric correction to sigma0 from weather model data as a linear power multiplier (not decibels). 1 float 9.96921E+36 1 to 10 1
/left/sig0_uncert 1-sigma uncertainty computed analytically using estimated signal to noise ratio and effective number of looks. Two-sided error bars (sig0-sig0_uncert,sig0+sig_uncert) include 68% of probability distribution. 1 float 9.96921E+36 0 to 100 1
/left/snr Signal to noise ratio as a linear power ratio. 1 float 9.96921E+36 -999999 to 999999 1
/left/time_doppler_miti Time of Doppler mitigation field in seconds in the UTC time scale since 1 Jan 2000 00:00:00 UTC. [tai_utc_difference] is the difference between TAI and UTC reference time (seconds) for the first measurement of the data set. If a leap second occurs within the data set, the attribute leap_second is set to the UTC time at which the leap second occurs. seconds since 2000-01-01 00:00:00.000 double 9.9692099683869E+36 N/A 1
/left/time_tai_doppler_miti Time of Doppler mitigation field in seconds in the TAI time scale since 1 Jan 2000 00:00:00 TAI. This time scale contains no leap seconds. The difference (in seconds) with time in UTC is given by the attribute [time:tai_utc_difference]. seconds since 2000-01-01 00:00:00.000 double 9.9692099683869E+36 N/A 1
/left/uncalibrated_power_minus_y Uncalibrated power for minus_y channel in linear units. 1 float 9.96921E+36 0 to 1.0E+20 1
/left/uncalibrated_power_plus_y Uncalibrated power for plus_y channel in linear units. 1 float 9.96921E+36 0 to 1.0E+20 1
/left/volumetric_correlation Volumetric correlation. 1 float 9.96921E+36 0 to 2 1
/left/volumetric_correlation_uncert 1-sigma uncertainty computed analytically using observed correlation and effective number of looks. Two-sided error bars (volumetric_correlation-volumetric_correlation_uncert, volumetric_correlation+volumetric_correlation_uncert) include 68% of probability distribution. 1 float 9.96921E+36 0 to 100 1
/left/x_factor_minus_y Radiometric calibration X factor as a linear power ratio for the minus_y channel. 1 float 9.96921E+36 0 to 1.0E+20 1
/left/x_factor_plus_y Radiometric calibration X factor as a linear power ratio for the plus_y channel. 1 float 9.96921E+36 0 to 1.0E+20 1
/right/angular_correlation Angular correlation. 1 float 9.96921E+36 0 to 2 1
/right/doppler_centroid On-board processor Doppler value. 1/s float 9.96921E+36 -1000000 to 1000000 1
/right/doppler_miti Uncalibrated, complex Doppler image (mitigation field). The complex value is computed by spatially averaging pulse-pair conjugate product values after range compression. Positive phase implies increasing range. 1 int 2147483647 -8388608 to 8388607 1
/right/geometric_correlation Geometric correlation. 1 float 9.96921E+36 0 to 2 1
/right/interferogram Complex interferogram. The real and imaginary parts are in the complex_depth array dimension. The magnitude of the interferogram represents the total interferometric correlation. 1 float 9.96921E+36 -1 to 1 1
/right/interferogram_qual Quality flag. N/A uint 4294967295 0 to 3255140359 1
/right/iono_cor_gim_ka Equivalent vertical correction due to ionosphere delay. The reported pixel height, latitude and longitude are computed after adding negative media corrections to uncorrected range along slant-range paths, accounting for the differential delay between the two KaRIn antennas. The equivalent vertical correction is computed by applying obliquity factors to the slant-path correction. Adding the reported correction to the reported pixel height results in the uncorrected pixel height. m float 9.96921E+36 -0.5 0 1
/right/model_dry_tropo_cor Equivalent vertical correction due to dry troposphere delay. The reported pixel height, latitude and longitude are computed after adding negative media corrections to uncorrected range along slant-range paths, accounting for the differential delay between the two KaRIn antennas. The equivalent vertical correction is computed by applying obliquity factors to the slant-path correction. Adding the reported correction to the reported pixel height results in the uncorrected pixel height. m float 9.96921E+36 -3 to -1.5 1
/right/model_wet_tropo_cor Equivalent vertical correction due to wet troposphere delay. The reported pixel height, latitude and longitude are computed after adding negative media corrections to uncorrected range along slant-range paths, accounting for the differential delay between the two KaRIn antennas. The equivalent vertical correction is computed by applying obliquity factors to the slant-path correction. Adding the reported correction to the reported pixel height results in the uncorrected pixel height. m float 9.96921E+36 -1 0 1
/right/noise_correlation Noise correlation. 1 float 9.96921E+36 0 to 2 1
/right/noise_power_minus_y noise power for minus y channel in linear unis. 1 float 9.96921E+36 0 to 1.0E+20 1
/right/noise_power_plus_y Noise power for plus_y channel in linear units. 1 float 9.96921E+36 0 to 1.0E+20 1
/right/num_looks Effective number of independent looks. 1 float 9.96921E+36 0 to 5000 1
/right/obp_ref_surface On-board processor reference surface height relative to the reference ellipsoid. m float 9.96921E+36 -1500 to 15000 1
/right/phase_bias_cor Total phase bias correction. rad float 9.96921E+36 -3.1415927 to 3.1415927 1
/right/phase_uncert 1-sigma uncertainty computed analytically using observed correlation and effective number of looks. Two-sided error bars (phase-phase_uncert,phase+phase_uncert) include approximately 68% of probability distribution. rad float 9.96921E+36 0 to 100 1
You're viewing 50 of 116