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Description

This dataset contains a simulated rasterized water surface elevation and inundation-extent product to be provided 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. This is a derived product through resampling the upstream dataset L2_HR_PIXC_V1 and L2_HR_PIXCVEC_V1 onto a uniform grid over the North America continent. A uniform grid is superimposed onto the pixel cloud from the source products, and all pixel-cloud samples within each grid cell are aggregated to produce a single value per raster cell. The raster data are produced geographically fixed tiles at resolutions of 100 m and 250 m in a Universal Transverse Mercator projection grid. 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
100 Meters x 100 Meters<br>250 Meters x 250 Meters
Geographic Region
NORTH AMERICA
Coordinate System
CARTESIAN
Granule Spatial Representation
CARTESIAN
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
C2263383790-POCLOUD
Data State
ACTIVE
Number of Files/Granules
880
Processing Level
2
Published
Science Keywords
Stage Height ,
Total Surface Water ,
Lakes/Reservoirs ,
Rivers/Streams

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 High Rate Raster Product Version 1.0 [Data set]. NASA Physical Oceanography Distributed Active Archive Center. https://doi.org/10.5067/KARIN-2RAS1 Date Accessed: 2025-12-14

Documents

USER'S GUIDE

ALGORITHM DOCUMENTATION

DATA CITATION GUIDELINES

GENERAL DOCUMENTATION

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
cross_track Approximate cross-track location of the pixel. m float 9.96921E+36 -75000 to 75000 1
crs UTM zone coordinate reference system. N/A string N/A N/A 1
dark_frac Fraction of pixel water area covered by dark water. l float 9.96921E+36 -1000 to 10000 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 float 9.96921E+36 -150 to 150 1
ice_clim_flag Climatological ice cover flag indicating whether the pixel is ice-covered on the day of the observation based on external climatological information (not the SWOT measurement). Values of 0, 1, and 2 indicate that the pixel is likely not ice covered, may or may not be partially or fully ice covered, and likely fully ice covered, respectively. N/A ubyte 255 0 to 2 1
ice_dyn_flag Dynamic ice cover flag indicating whether the surface is ice-covered on the day of the observation based on analysis of external satellite optical data. Values of 0, 1, and 2 indicate that the pixel is not ice covered, partially ice covered, and fully ice covered, respectively. N/A ubyte 255 0 to 2 1
illumination_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
illumination_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 [illumination_time:tai_utc_difference]. seconds since 2000-01-01 00:00:00.000 double 9.9692099683869E+36 N/A 1
inc Incidence angle. degrees float 9.96921E+36 0 to 90 1
iono_cor_gim_ka Equivalent vertical correction due to ionosphere delay. The reported water surface elevation, 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 water surface elevation results in the uncorrected pixel height. m float 9.96921E+36 -0.5 0 1
latitude Latitude [-80,80] (degrees north of equator) of the pixel. degrees_north double 9.9692099683869E+36 -80 to 80 1
layover_impact Estimate of the water surface elevation error caused by layover. m float 9.96921E+36 -999999 to 999999 1
load_tide_fes Geocentric load tide height. The effect of the ocean tide loading of the Earth’s crust. m float 9.96921E+36 -0.2 to 0.2 1
load_tide_got Geocentric load tide height. The effect of the ocean tide loading of the Earth’s crust. This value is reported for reference but is not applied to the reported height. m float 9.96921E+36 -0.2 to 0.2 1
longitude Longitude [-180,180) (east of the Greenwich meridian) of the pixel. degrees_east double 9.9692099683869E+36 -180 to 180 1
model_dry_tropo_cor Equivalent vertical correction due to dry troposphere delay. The reported water surface elevation, 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 water surface elevation results in the uncorrected pixel height. m float 9.96921E+36 -3 to -1.5 1
model_wet_tropo_cor Equivalent vertical correction due to wet troposphere delay. The reported water surface elevation, 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 water surface elevation results in the uncorrected pixel height. m float 9.96921E+36 -1 0 1
n_area_pix Number of pixel cloud samples used in water area and water fraction aggregation. l uint 4294967295 0 to 999999 1
n_wse_pix Number of pixel cloud samples used in water surface elevation aggregation. l uint 4294967295 0 to 999999 1
pole_tide Geocentric pole tide height. The total of the contribution from the solid-Earth (body) pole tide height and the load pole tide height (i.e., the effect of the ocean pole tide loading of the Earth’s crust). m float 9.96921E+36 -0.2 to 0.2 1
raster_qual Quality flag for raster data. N/A ubyte 255 0 to 1 1
sig0 Normalized radar cross section (sigma0) in real, linear units (not decibels). The value may be negative due to noise subtraction. 1 float 9.96921E+36 -1000 to 10000000 1
sig0_uncert 1-sigma uncertainty in sigma0. The value is provided in linear units. This value is a one-sigma additive (not multiplicative) uncertainty term, which can be added to or subtracted from sigma0. 1 float 9.96921E+36 0 to 1000 1
solid_earth_tide Solid-Earth (body) tide height. The zero-frequency permanent tide component is not included. m float 9.96921E+36 -1 to 1 1
water_area Surface area of the water pixels. m^2 float 9.96921E+36 -2000000 to 2000000000 1
water_area_uncert 1-sigma uncertainty in the water surface area m^2 float 9.96921E+36 0 to 2000000000 1
water_frac Fraction of the pixel that is water. 1 float 9.96921E+36 -1000 to 10000 1
water_frac_uncert 1-sigma uncertainty in the water fraction. 1 float 9.96921E+36 0 to 999999 1
wse Water surface elevation of the pixel above the geoid and after using models to subtract the effects of tides (solid_earth_tide, load_tide_fes, pole_tide). m float 9.96921E+36 -1500 to 15000 1
wse_uncert 1-sigma uncertainty in the water surface elevation. m float 9.96921E+36 0 to 999999 1
x UTM easting coordinate of the pixel. m double 9.9692099683869E+36 -10000000 to 10000000 1
y UTM northing coordinate of the pixel. m double 9.9692099683869E+36 -20000000 to 20000000 1
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