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Description

This dataset includes simulated water surface elevations that resemble the Ka-band Interferometer (KaRIn) measurements by the Surface Water and Ocean Topography (SWOT) mission. SWOT will provide a global coverage but this simulated subset focuses on the North America continent. The simulated SWOT KaRIN swaths span 128 km in the cross-swath direction with a 20-km nadir gap. The primary product contains the following: 1. Geolocated elevations (latitude, longitude, and height) 2. Classification mask (water/land flags, and water fraction) 3. Surface areas (projected pixel area on the ground) 4. Relevant data needed to compute and aggregate height and area uncertainties. Additional information includes: 1. Meta data (global instrument parameters) 2. Time varying parameters (TVP), which include sensor position, velocity, altitude, and time 3. Noise power estimates 4. Quality flags 5. Interferogram measurements (power and phase) and range and azimuth indices 6. Geophysical and crossover-calibration correction values. These additional fields are provided to improve the utility of the product and to facilitate generation of downstream products. Note that this is a simulated SWOT product and not suited for any scientific exploration.

Product Summary

Platforms
COMPUTERS
Instruments
Computer
Spatial Extent

N: 52 S: 24 E: -82 W: -113

Spatial Resolution
20 Meters x 20 Meters
Location
NORTH AMERICA
Coordinate System
GEODETIC
Granule Spatial Representation
GEODETIC
Temporal Extent
2022-08-01 to 2022-08-22
Data Partner
Physical Oceanography Distributed Active Archive Center, Jet Propulsion Laboratory, NASA (NASA/JPL/PODAAC)
Concept ID
C2263383386-POCLOUD
Data State
ACTIVE
Number of Files/Granules
1644
Processing Level
2
Published
Science Keywords
Lakes/Reservoirs ,
Rivers/Streams ,
Stage Height ,
Total Surface Water

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 North America Continent KaRIn High Rate Water Mask Pixel Cloud Product Version 1.0 [Data set]. NASA Physical Oceanography Distributed Active Archive Center. https://doi.org/10.5067/KARIN-2PIX1 Date Accessed: 2026-06-07

Documents

USER'S GUIDE

ALGORITHM DOCUMENTATION

DATA CITATION GUIDELINES

GENERAL DOCUMENTATION

Variables

The table below lists the variables contained within a single granule for this dataset. Variables often contain observed or derived geophysical measurements collected from a variety of sources, including remote sensing instruments on satellite and airborne platforms, field campaigns, in situ measurements, and model outputs. The terms variable, parameter, scientific data set, layer, and band have been used across NASA’s Earth science disciplines; however, variable is the designated nomenclature in NASA’s Common Metadata Repository (CMR). Variable metadata attributes such as Name, Description, Units, Data Type, Fill Value, Valid Range, and Scale Factor allow users to efficiently process and analyze the data. The full range of attributes may not be applicable to all variables. Additional information on variable attributes is typically available in the data, user guide, and/or other product documentation.

For questions on a specific variable, please use the Earthdata Forum.

Name Description Units Data Type Fill Value Valid Range Scale Factor Offset
/pixel_cloud/water_frac_uncert Uncertainty estimate of the water fraction estimate (width of noisy water frac estimate distribution). 1 float 9.96921E+36 0 to 999999 1 N/A
/pixel_cloud/x_factor_minus_y X factor for the minus_y channel power in linear units (arbitrary units to normalize noise-subtracted power to sigma0). 1 float 9.96921E+36 0 to 999999 1 N/A
/pixel_cloud/x_factor_plus_y X factor for the plus_y channel power in linear units (arbitrary units to normalize noise-subtracted power to sigma0). 1 float 9.96921E+36 0 to 999999 1 N/A
/tvp/altitude Altitude above the reference ellipsoid of the KMSF origin. m double 9.9692099683869E+36 0 to 1000000 1 N/A
/tvp/latitude Geodetic latitude of the KMSF origin with respect to the reference ellipsoid. degrees_north double 9.9692099683869E+36 -80 to 80 1 N/A
/tvp/longitude Longitude of the KMSF origin, with positive values indicating longitudes east of the Greenwich meridian. degrees_east double 9.9692099683869E+36 -180 to 180 1 N/A
/tvp/minus_y_antenna_x x coordinate of the minus_y antenna phase center in the ECEF frame. m double 9.9692099683869E+36 -10000000 to 10000000 1 N/A
/tvp/minus_y_antenna_y y coordinate of the minus_y antenna phase center in the ECEF frame. m double 9.9692099683869E+36 -10000000 to 10000000 1 N/A
/tvp/minus_y_antenna_z z coordinate of the minus_y antenna phase center in the ECEF frame. m double 9.9692099683869E+36 -10000000 to 10000000 1 N/A
/tvp/pitch KMSF attitude pitch angle; positive values move the KMSF +x axis up. degrees double 9.9692099683869E+36 -180 to 180 1 N/A
/tvp/plus_y_antenna_x x coordinate of the plus_y antenna phase center in the ECEF frame. m double 9.9692099683869E+36 -10000000 to 10000000 1 N/A
/tvp/plus_y_antenna_y y coordinate of the plus_y antenna phase center in the ECEF frame. m double 9.9692099683869E+36 -10000000 to 10000000 1 N/A
/tvp/plus_y_antenna_z z coordinate of the plus_y antenna phase center in the ECEF frame. m double 9.9692099683869E+36 -10000000 to 10000000 1 N/A
/tvp/record_counter Index of the TVP record used to align data samples across granules. 1 int 2147483647 1 to 999999999 1 N/A
/tvp/roll KMSF attitude roll angle; positive values move the +y antenna down. degrees double 9.9692099683869E+36 -180 to 180 1 N/A
/tvp/sc_event_flag Spacecraft event flag N/A byte 127 0 to 1 1 N/A
/tvp/time Time of measurement 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 N/A
/tvp/time_tai Time of measurement 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 N/A
/tvp/tvp_qual Quality flag for TVP data N/A byte 127 0 to 1 1 N/A
/tvp/velocity_heading Angle with respect to true north of the horizontal component of the spacecraft Earth-relative velocity vector. A value of 90 deg indicates that the spacecraft velocity vector pointed due east. Values between 0 and 90 deg indicate that the velocity vector has a northward component, and values between 90 and 180 deg indicate that the velocity vector has a southward component. degrees double 9.9692099683869E+36 0 to 360 1 N/A
/tvp/vx KMSF velocity component in x direction in the ECEF frame. m/s double 9.9692099683869E+36 -10000 to 10000 1 N/A
/tvp/vy KMSF velocity component in y direction in the ECEF frame. m/s double 9.9692099683869E+36 -10000 to 10000 1 N/A
/tvp/vz KMSF velocity component in z direction in the ECEF frame. m/s double 9.9692099683869E+36 -10000 to 10000 1 N/A
/tvp/x x coordinate of the KMSF origin in the ECEF frame. m double 9.9692099683869E+36 -10000000 to 10000000 1 N/A
/tvp/y y coordinate of the KMSF origin in the ECEF frame. m double 9.9692099683869E+36 -10000000 to 10000000 1 N/A
/tvp/yaw KMSF attitude yaw angle relative to the nadir track. The yaw angle is a right-handed rotation about the nadir (downward) direction. A yaw value of 0 deg indicates that the KMSF +x axis is aligned with the horizontal component of the Earth-relative velocity vector. A yaw value of 180 deg indicates that the spacecraft is in a yaw-flipped state, with the KMSF -x axis aligned with the horizontal component of the Earth-relative velocity vector. degrees double 9.9692099683869E+36 -180 to 180 1 N/A
/tvp/z z coordinate of the KMSF origin in the ECEF frame. m double 9.9692099683869E+36 -10000000 to 10000000 1 N/A
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