SWOT Level 2 Nadir Altimeter Operational Geophysical Data Record with Waveforms Version D

The SWOT Level 2 Nadir Altimeter Operational Geophysical Data Record (OGDR) with Waveforms Version D dataset produced by the Surface Water and Ocean Topography (SWOT) mission provides sea surface height, significant wave height and wind speed measurements from the Poseidon-3C nadir altimeter, a Jason-class dual frequency (Ku/C) altimeter. SWOT is a joint mission between NASA and CNES that launched on December 16, 2022. It aims to measure ocean surface topography with unprecedented resolution and accuracy, as well as map inland water bodies globally. The OGDR dataset consists of discrete measurements along the nadir track with sampling resolutions of approximately 6-km and 300-m at 1Hz and 20Hz, respectively. The data were processed using the onboard DORIS orbit ephemeris, with predicted values for certain auxiliary data and no GIM ionosphere model values. The OGDR data are distributed as one file per data downlink in netCDF-4 file format with a nominal latency of < 7 hours.

This collection is the parent collection to the following sub-collections:

https://podaac.jpl.nasa.gov/dataset/SWOT_L2_NALT_OGDR_SSHA_D

https://podaac.jpl.nasa.gov/dataset/SWOT_L2_NALT_OGDR_GDR_D

Data and Resources

Additional Info

Field Value
Maintainer Earthdata Forum
Last Updated November 5, 2026, 08:59 (UTC)
Created May 12, 2025, 04:50 (UTC)
Identifier 10.5067/SWOT-NALT-OGDR-D
Modified 2026-11-02T22:15:59Z
Theme {"Earth Science"}
accessLevel public
bureauCode {026:00}
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harvest_object_id e08fdca4-6ce4-4480-b4e9-c25a137d9172
harvest_source_id b99e41c6-fe79-4c19-bbc3-9b6c8111bfac
harvest_source_title Science Discovery Engine
license https://www.usa.gov/government-works
programCode {026:000}
publisher Jet Propulsion Laboratory;NASA/JPL/PODAAC
resource-type Dataset
source_datajson_identifier true
source_hash 0a42f1eb94c37914fc94b6688d48a52a3adea7bad191046e0d46b5db0b0bc57d
source_schema_version 1.1
spatial ["CARTESIAN", [{"NorthBoundingCoordinate": 77.6, "WestBoundingCoordinate": -180.0, "EastBoundingCoordinate": 180.0, "SouthBoundingCoordinate": -77.6}]]