Integrated Multi-Mission Ocean Altimeter Data for Climate Research Version 6.1

The Integrated Multi-Mission Ocean Altimeter Sea Surface Height (SSH) Version 6.1 dataset provides level 2 along track sea surface height anomalies (SSHA) for 10-day cycles from the TOPEX/Poseidon, Jason-1, OSTM/Jason-2, Jason-3, and Sentinel-6A missions geo-referenced to a mean reference orbit. It is produced by NASA Sea Surface Height (NASA-SSH) project investigators at Goddard Space Flight Center and Jet Propulsion Laboratory with support from NASA’s Physical Oceanography program, and was developed originally as an Earth System Data Record (ESDR) under the Making Earth System Data Records for Use in Research Environments (MEaSUREs) program, which supported forward processing and incremental refinements through version 5.1 (released in April 2022).

Geophysical Data Records (GDRs) from each altimetry mission were interpolated to a common reference orbit with biases and cross-calibrations applied so that the derived SSHA are consistent between satellites to form a single homogeneous climate data record. The entire multi-mission data record covers the period from September 1992 to present; it is extended to include new observations approximately once each quarter. The current release (version 6.0) applies the following revisions: a) GSFC std2400 orbit for T/P and Jason-1 (cycles 169 – 259), b) JPL_igs20 orbit for Jason-1 (cycles 1 – 168), Jason-2, Jason-3, and Sentinel-6a, c) ITRF2020 terrestrial reference frame, d) Jason-2 GDR_F data, e) Sentinel-6a LR version F09/G01 data through cycle 166, f) GOT5.6D ocean tide model, g) Range latitudinal empirical correction for Jason-1,2, & 3 GDRs. More information about the data content and derivation can be found in the v6.0 User’s Handbook.

Data and Resources

Additional Info

Field	Value
Maintainer	Earthdata Forum
Last Updated	November 3, 2026, 05:20 (UTC)
Created	June 3, 2026, 02:34 (UTC)
Identifier	10.5067/ALTCY-TJA61
Modified	2026-10-26T22:16:12Z
Theme	{"Earth Science"}
accessLevel	public
bureauCode	{026:00}
catalog_conformsTo	https://project-open-data.cio.gov/v1.1/schema
harvest_object_id	dd8386a5-3725-45d2-85e7-8c739a868f70
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	NASA/GSFC/SED/ESD;NASA/JPL/PODAAC
resource-type	Dataset
source_datajson_identifier	true
source_hash	3d341b106520551f338bce02bce0e22e84957cbf25764eb5a88f76ab7bea1a9a
source_schema_version	1.1
spatial	["CARTESIAN", [{"NorthBoundingCoordinate": 66, "WestBoundingCoordinate": -180, "EastBoundingCoordinate": 180, "SouthBoundingCoordinate": -66}]]
temporal	1992-09-25/2026-01-04