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

The SWOT Level 2 Radiometer Brightness Temperatures and Troposphere Interim Geophysical Data Record (IGDR) Version D 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. It aims to measure ocean surface topography with unprecedented resolution and accuracy, as well as map inland water bodies globally. The interim 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 Medium-accuracy (preliminary) Orbit Ephemeris (MOE) with preliminary calibrations applied. They are distributed as one file per half-orbit in netCDF4 file format with a nominal latency of < 1.5 days.

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-IGDR-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	3cf29b4d-bd24-4657-b469-a5b578d52f26
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	3a4895c27853c94f0f7617d2b11018a2ce4362c2b698e76adf4cfc88a24f7203
source_schema_version	1.1
spatial	["CARTESIAN", [{"WestBoundingCoordinate": -180.0, "NorthBoundingCoordinate": 77.6, "EastBoundingCoordinate": 180.0, "SouthBoundingCoordinate": -77.6}]]