SWOT Level 2 Radiometer Brightness Temperatures and Troposphere Data Product Version D

The SWOT Level 2 Radiometer Brightness Temperatures and Troposphere Geophysical Data Record (GDR) dataset produced by the Surface Water and Ocean Topography (SWOT) mission provides atmospheric water vapor and liquid water content from the Advanced Microwave Radiometer (AMR), a Jason-class radiometer that measures sea surface brightness temperatures at three microwave frequencies (18.7, 23.8 and 34 GHz). Brightness temperatures are processed to estimate the wet troposphere content, atmospheric attenuation to backscatter, cloud liquid water, water vapor content, and wind speed coincident with each range measurement from the nadir altimeter and applied to correct for altimeter range delays caused by atmospheric effects. SWOT is a joint mission between NASA and CNES that launched on December 16, 2022 and aims to measure ocean surface topography with unprecedented resolution and accuracy, as well as map inland water bodies globally. This radiometer dataset consists of discrete measurements along two tracks located approximately 30-km to the left and right of the satellite nadir. The data were processed using the Precise Orbit Ephemeris (POE) and analyzed calibrations. The data are available with latency of < 90 days and distributed in netCDF-4 file format.

Data and Resources

Additional Info

Field	Value
Maintainer	Earthdata Forum
Last Updated	November 5, 2026, 08:58 (UTC)
Created	May 12, 2025, 04:50 (UTC)
Identifier	10.5067/SWOT-RAD-GDR-D
Modified	2026-11-02T22:15:59Z
Theme	{"Earth Science"}
accessLevel	public
bureauCode	{026:00}
catalog_conformsTo	https://project-open-data.cio.gov/v1.1/schema
harvest_object_id	58b36d0b-cf42-4277-b896-3e244a491a38
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	5456f195bcd3418005391771db4a810ae7c58ae2a00c7c9db80b1d2ff604aa4a
source_schema_version	1.1
spatial	["CARTESIAN", [{"WestBoundingCoordinate": -180.0, "NorthBoundingCoordinate": 77.6, "EastBoundingCoordinate": 180.0, "SouthBoundingCoordinate": -77.6}]]