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Description

This dataset provides simulated sea surface height data product that resembles data which will be collected by KaRIn. Swaths span 60 km on both sides of nadir with a nadir gap. Product provides sea surface height, sea surface height anomaly, wind speed, significant waveheight, on a geographically fixed, swath-aligned 2x2 km2 grid, as well as sea surface height on a 250x250 m2 native grid. SSH data produced by GLORYS were rendered from their native output format into the format prescribed in the SWOT L2 SSH PDD to aid ongoing data product development and to benefit future users of data produced during operational phases of the SWOT mission.

Product Summary

Platforms
COMPUTERS
Instruments
Computer
Spatial Extent

N: 77.6 S: -77.6 E: 180 W: -180

Spatial Resolution
2000 Meters x 2000 Meters
Coordinate System
CARTESIAN
Granule Spatial Representation
CARTESIAN
Temporal Extent
2014-04-12 to 2015-12-31
Vertical Extent
Maximum Depth: 6134.5<br>Minimum Depth: 0
Data Partner
Physical Oceanography Distributed Active Archive Center, Jet Propulsion Laboratory, NASA (NASA/JPL/PODAAC)
Concept ID
C2152045877-POCLOUD
Data State
COMPLETE
Number of Files/Granules
17564
Processing Level
2
Published
Science Keywords
Sea Surface Height

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

CNES. (2022). SWOT Simulated Level-2 KaRIn SSH from GLORYS for Science Version 1 [Data set]. NASA Physical Oceanography Distributed Active Archive Center. https://doi.org/10.5067/KARIN-2GLS1 Date Accessed: 2025-12-14

Documents

USER'S GUIDE

DATA CITATION GUIDELINES

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
ancillary_surface_classification_flag 7-state surface type classification computed from a mask built with MODIS and GlobCover data. N/A ubyte 255 0 to 6 1
correction_flag Quality flag for corrections. N/A ubyte 255 0 to 1 1
cross_track_angle Angle with respect to true north of the cross-track direction to the right of the spacecraft velocity vector. degrees int 2147483647 0 to 359999999 1.0E-6
cross_track_distance Distance of sample from nadir. Negative values indicate the left side of the swath, and positive values indicate the right side of the swath. m float 9.96921E+36 -75000 to 75000 1
dac Model estimate of the effect on sea surface topography due to high frequency air pressure and wind effects and the low-frequency height from inverted barometer effect (inv_bar_cor). This value is subtracted from the ssh_karin and ssh_karin_2 to compute ssha_karin and ssha_karin_2, respectively. Use only one of inv_bar_cor and dac. m short 32767 -12000 to 12000 0.0001
depth_or_elevation Ocean depth or land elevation above reference ellipsoid. Ocean depth (bathymetry) is given as negative values, and land elevation positive values. m short 32767 -12000 to 10000 1
distance_to_coast Approximate distance to the nearest coast point along the Earth surface. m ushort 65535 0 to 21000 1000
doppler_centroid Doppler centroid (in hertz or cycles per second) estimated by KaRIn. 1/s short 32767 -30000 to 30000 1
dynamic_ice_flag Dynamic ice flag for the location of the KaRIn measurement. N/A ubyte 255 0 to 2 1
geoid Geoid height above the reference ellipsoid with a correction to refer the value to the mean tide system, i.e. includes the permanent tide (zero frequency). m int 2147483647 -1500000 to 1500000 0.0001
heading_to_coast Approximate compass heading (0-360 degrees with respect to true north) to the nearest coast point. degrees ushort 65535 0 to 35999 0.01
height_cor_xover Height correction from KaRIn crossover calibration. To apply this correction the value of height_cor_xover should be added to the value of ssh_karin, ssh_karin_2, ssha_karin, and ssha_karin_2. m int 2147483647 -100000 to 100000 0.0001
ice_conc Concentration of sea ice from model. % short 32767 0 to 10000 0.01
internal_tide_hret Coherent internal ocean tide. This value is subtracted from the ssh_karin and ssh_karin_2 to compute ssha_karin and ssha_karin_2, respectively. m short 32767 -2000 to 2000 0.0001
internal_tide_sol2 Coherent internal tide. m short 32767 -2000 to 2000 0.0001
inv_bar_cor Estimate of static effect of atmospheric pressure on sea surface height. Above average pressure lowers sea surface height. Computed by interpolating ECMWF pressure fields in space and time. The value is included in dac. To apply, add dac to ssha_karin and ssha_karin_2 and subtract inv_bar_cor. m short 32767 -2000 to 2000 0.0001
iono_cor_gim_ka Equivalent vertical correction due to ionosphere delay. The reported sea surface 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 sea surface height results in the uncorrected sea surface height. m short 32767 -5000 0 0.0001
latitude Latitude of measurement [-80,80]. Positive latitude is North latitude, negative latitude is South latitude. degrees_north int 2147483647 -80000000 to 80000000 1.0E-6
latitude_avg_ssh Latitude of measurement [-80,80]. Positive latitude is North latitude, negative latitude is South latitude. This value may be biased away from a nominal grid location if some of the native, unsmoothed samples were discarded during processing. degrees_north int 2147483647 -80000000 to 80000000 1.0E-6
latitude_nadir Geodetic latitude [-80,80] (degrees north of equator) of the satellite nadir point. degrees_north int 2147483647 -80000000 to 80000000 1.0E-6
load_tide_fes Geocentric load tide height. The effect of the ocean tide loading of the Earth&#039;s crust. This value has already been added to the corresponding ocean tide height value (ocean_tide_fes). m short 32767 -2000 to 2000 0.0001
load_tide_got Geocentric load tide height. The effect of the ocean tide loading of the Earth&#039;s crust. This value has already been added to the corresponding ocean tide height value (ocean_tide_got). m short 32767 -2000 to 2000 0.0001
longitude Longitude of measurement. East longitude relative to Greenwich meridian. degrees_east int 2147483647 0 to 359999999 1.0E-6
longitude_avg_ssh Longitude of measurement. East longitude relative to Greenwich meridian. This value may be biased away from a nominal grid location if some of the native, unsmoothed samples were discarded during processing. degrees_east int 2147483647 0 to 359999999 1.0E-6
longitude_nadir Longitude (degrees east of Grenwich meridian) of the satellite nadir point. degrees_east int 2147483647 0 to 359999999 1.0E-6
mean_dynamic_topography Mean dynamic topography above the geoid. m short 32767 -30000 to 30000 0.0001
mean_dynamic_topography_uncert Accuracy of the mean dynamic topography. m ushort 65535 0 to 10000 0.0001
mean_sea_surface_cnescls Mean sea surface height above the reference ellipsoid. The value is referenced to the mean tide system, i.e. includes the permanent tide (zero frequency). m int 2147483647 -1500000 to 1500000 0.0001
mean_sea_surface_cnescls_uncert Accuracy of the mean sea surface height (mean_sea_surface_cnescls). m ushort 65535 0 to 10000 0.0001
mean_sea_surface_dtu Mean sea surface height above the reference ellipsoid. The value is referenced to the mean tide system, i.e. includes the permanent tide (zero frequency). m int 2147483647 -1500000 to 1500000 0.0001
mean_sea_surface_dtu_uncert Accuracy of the mean sea surface height (mean_sea_surface_dtu) m ushort 65535 0 to 10000 0.0001
mean_wave_direction Mean sea surface wave direction. degree ushort 65535 0 to 36000 0.01
mean_wave_period_t02 Sea surface wind wave mean period from model spectral density second moment. s ushort 65535 0 to 100 0.001
model_dry_tropo_cor Equivalent vertical correction due to dry troposphere delay. The reported sea surface 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 sea surface height results in the uncorrected sea surface height. m short 32767 -30000 to -15000 0.0001
model_wet_tropo_cor Equivalent vertical correction due to wet troposphere delay from weather model data. 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 sea surface height (ssh_karin_2) results in the uncorrected sea surface height. m short 32767 -10000 0 0.0001
num_pt_avg Number of native unsmoothed, beam-combined KaRIn samples averaged. 1 ushort 65535 0 to 289 1
obp_ref_surface Height (relative to the reference ellipsoid) of the reference surface used by the KaRIn on-board processor. m int 2147483647 -15000000 to 150000000 0.0001
ocean_tide_eq Equilibrium long-period ocean tide height. This value has already been added to the corresponding ocean tide height values (ocean_tide_fes and ocean_tide_got). m short 32767 -2000 to 2000 0.0001
ocean_tide_fes Geocentric ocean tide height. Includes the sum total of the ocean tide, the corresponding load tide (load_tide_fes) and equilibrium long-period ocean tide height (ocean_tide_eq). m int 2147483647 -300000 to 300000 0.0001
ocean_tide_got Geocentric ocean tide height. Includes the sum total of the ocean tide, the corresponding load tide (load_tide_got) and equilibrium long-period ocean tide height (ocean_tide_eq). m int 2147483647 -300000 to 300000 0.0001
ocean_tide_non_eq Non-equilibrium long-period ocean tide height. This value is reported as a relative displacement with repsect to ocean_tide_eq. This value can be added to ocean_tide_eq, ocean_tide_fes, or ocean_tide_got, or subtracted from ssha_karin and ssha_karin_2, to account for the total long-period ocean tides from equilibrium and non-equilibrium contributions. m short 32767 -2000 to 2000 0.0001
orbit_alt_rate Orbital altitude rate with respect to the mean sea surface. m/s short 32767 -3500 to 3500 0.01
orbit_qual Orbit quality flag. N/A ubyte 255 0 to 1 1
phase_bias_ref_surface Height (relative to the reference ellipsoid) of the reference surface used for phase bias calculation during L1B processing. m int 2147483647 -15000000 to 150000000 0.0001
polarization_karin H denotes co-polarized linear horizontal, V denotes co-polarized linear vertical. N/A string N/A N/A 1
pole_tide Geocentric pole tide height. The total of the contribution from the solid-Earth (body) pole tide height, the ocean pole tide height, and the load pole tide height (i.e., the effect of the ocean pole tide loading of the Earth&#039;s crust). m short 32767 -2000 to 2000 0.0001
rad_cloud_liquid_water Integrated cloud liquid water content from radiometer measurements. kg/m^2 short 32767 0 to 2000 0.01
rad_surface_type_flag Flag indicating the validity and type of processing applied to generate the wet troposphere correction (rad_wet_tropo_cor). A value of 0 indicates that open ocean processing is used, a value of 1 indicates coastal processing, and a value of 2 indicates that rad_wet_tropo_cor is invalid due to land contamination. N/A ubyte 255 0 to 2 1
rad_tmb_187 Main beam brightness temperature measurement at 18.7 GHz. Value is unsmoothed (along-track averaging has not been performed). K short 32767 13000 to 25000 0.01
rad_tmb_238 Main beam brightness temperature measurement at 23.8 GHz. Value is unsmoothed (along-track averaging has not been performed). K short 32767 13000 to 25000 0.01
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