SWOT Level 2 Lake Single-Pass Vector Unassigned Data Product, Version D

(SWOT_L2_HR_LakeSP_unassigned_D)
VersionD
Processing Level2
Start/Stop Date2022-Dec-16 to Present
Short NameSWOT_L2_HR_LakeSP_unassigned_D
DescriptionThe SWOT Level 2 Lake Single-Pass Vector Product (SWOT_L2_HR_LakeSP_D) provides geolocated surface water measurements for lakes and unclassified water bodies, derived from high-resolution radar observations collected by the Ka-band Radar Interferometer (KaRIn) on the SWOT satellite. This product reports water surface elevation, surface area, and quality indicators for each observed lake or feature, with polygons generated from the PIXCVec pixel cloud. It includes features linked to the Prior Lake Database (PLD), as well as unassigned features not recognized as lakes or rivers in the PLD or PRD.

Each granule covers a full KaRIn swath for a single continental pass and contains three ESRI shapefiles: one observation-oriented file of observed PLD lakes, one PLD-oriented file with prior lake features (including unobserved ones), and one file for unassigned features. Observed quantities are referenced to the WGS84 ellipsoid and corrected for geoid height, solid Earth, load, and pole tides, as well as tropospheric and ionospheric path delays. Attributes also include uncertainties, flags for partial or dark water coverage, ice cover, and crossover calibration. Storage change estimates are reported in the PLD-oriented shapefile using both direct and incremental methods under different bathymetric assumptions.

The LakeSP product provides consistent reach-scale and basin-level lake measurements suitable for time series analyses, hydrologic modeling, and integration with prior lake databases. It enables monitoring of water level changes and surface area dynamics across a wide range of inland water bodies and supports hydrological applications in water balance studies, reservoir management, and climate impact assessment.
This collection is a sub-collection of its parent: https://podaac.jpl.nasa.gov/dataset/SWOT_L2_HR_LakeSP_D It contains feature datasets of unassigned water features that were not identified in the PLD or PRD.
DOI10.5067/SWOT-LAKESP-D
MeasurementTERRESTRIAL HYDROSPHERE > SURFACE WATER > SURFACE WATER PROCESSES/MEASUREMENTS
TERRESTRIAL HYDROSPHERE > SURFACE WATER > SURFACE WATER FEATURES
Swath Width120 km
Platform/Sensor
SWOT
Platform
Name: Surface Water Ocean Topography (SWOT)
/
KaRIn
SENSOR
Name: Ka-band Radar Interferometer (KaRIn)

SWOT
Platform
Name: Surface Water Ocean Topography (SWOT)
/
Jason-class Altimeter
SENSOR
Name: Jason-class Altimeter (Jason-class Altimeter)

SWOT
Platform
Name: Surface Water Ocean Topography (SWOT)
/
AMR
SENSOR
Name: Advanced Microwave Radiometer (AMR)
Swath Width: 18.7 ghz
Description: The operating frequency which is aimed towards recovery of atmospheric attenuation due to sigma0
Swath Width: 23.8 ghz
Description: The operating frequency which is aimed towards recovery of atmospheric attenuation due to water vapor
Swath Width: 34.0 ghz
Description: The operating frequency which is aimed towards recovery of atmospheric attenuation due to cloud liquid water.

SWOT
Platform
Name: Surface Water Ocean Topography (SWOT)
/
DORIS
SENSOR
Name: Doppler Orbitography and Radiopositioning Integrated by Satellite (DORIS)

SWOT
Platform
Name: Surface Water Ocean Topography (SWOT)
/
GPSP
SENSOR
Name: Global Positioning System Payload (GPSP)

SWOT
Platform
Name: Surface Water Ocean Topography (SWOT)
/
LRA
SENSOR
Name: Laser Retroreflector Array (LRA)

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ProjectSurface Water Ocean Topography (SWOT)
Data ProviderPublisher: JPL NASA
Creator: Surface Water Ocean Topography (SWOT)
Release Place: Jet Propulsion Laboratory
Release Date: 2025-May-13
Resource: https://swot.jpl.nasa.gov/

FormatShapefile
Questions related to this dataset? Contact podaac@podaac.jpl.nasa.gov
Coverage
Region: GLOBAL
North Bounding Coordinate: 90 degrees
South Bounding Coordinate: -90 degrees
West Bounding Coordinate: -180 degrees
East Bounding Coordinate: 180 degrees
Time Span: 2022-Dec-16 to Present
Swath Width: 120 km
 
Citation is critically important for dataset documentation and discovery. Please cite the data as follows, and cite the reference papers when it is appropriate.
Citation Surface Water Ocean Topography (SWOT). 2025. SWOT Level 2 Lake Single-Pass Vector Unassigned Data Product, Version D. Ver. D. PO.DAAC, CA, USA. Dataset accessed [YYYY-MM-DD] at https://doi.org/10.5067/SWOT-LAKESP-D

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For more information see Data Citations and Acknowledgments.
Journal Reference JPL Internal Document. 2018. Surface Water and Ocean Topography Mission (SWOT) Project: Science Requirements Document, JPL D-61923, Rev. B, Jet Propulsion Laboratory.