Delivery of Suomi National Polar-orbiting Partnership (Suomi NPP) satellite data products will cease on November 1, 2026. Data users should transition now to alternative products from NOAA-21 and NOAA-20. Suomi NPP data announcement

Poseidon-4 Radar Altimeter Resources

Earthdata resources for users working with NASA’s Poseidon-4 Radar Altimeter data include tutorials and other learning resources, news announcements such as instrument updates and data releases, user guides and related documents, and frequently asked questions.

Poseidon-4 Radar Altimeter Learning Resources

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Image captured on Jan 15, 2022, by the ABI instrument aboard the GOES-West satellite

The 2022 Hunga-Tonga Hunga-Ha′apai Eruption

Altimetry data and models reveal how a volcanic eruption generated a tsunami.

Data in Action

March 20, 2025

Jason 3 satellite mapping the ocean surface with its radar altimeter

The Rate of Global Sea Level Rise Doubled During the Past Three Decades

For more than 30 years, NASA and its partners have flown satellite altimeter missions providing essential sea level change data to inform coastal communities.

Data in Action

Feb. 5, 2025

comparison of sea level anomalies between el nino events of 2007 and 2015

Sea Level Satellites Monitor How This Year’s El Niño Is Shaping Up

Sea surface height data from the Sentinel-6 Michael Freilich mission reveal complex interactions between the ocean and the atmosphere that affect global weather and climate such as El Niño.

Data in Action

Oct. 31, 2023

El Nino conditions in the Pacific Ocean from 2023

Pacific Ocean Conditions Favorable for Winter 2023/2024 El Niño Development

Satellite data provides indicators of El Niño events.

Data in Action

June 15, 2023

Satellite Observations for Analyzing Natural Hazards on Small Island Nations

This ARSET training introduces data, methods, and tools useful for monitoring natural hazards on small island nations.

Training

Aug. 18-26, 2021

Observaciones de Satélites para el Análisis de Peligros Naturales en los Pequeños Estados Insulares

Esta capacitación de ARSET introduce datos, métodos y herramientas útiles para monitorear peligros naturales en pequeñas naciones insulares.

Training

Aug. 18-26, 2021

Webinar Banner Image- PO.DAAC (03/24/21)

An Open Ocean of Remote Sensing and In Situ Data for Science in the Cloud

Join us to learn about NASA's archive for physical oceanography data in the context of Open Science. We'll provide you with an introduction to remote sensing and in situ products at PO.DAAC and show you how to work with these data in the cloud.

Webinar

April 22, 2021

image of phytoplankton bloom in the Baltic Sea

Globally Averaged Sea Level

Charting global mean sea level rise since 1900.

Data in Action

Nov. 19, 2020

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Poseidon-4 Radar Altimeter News

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Gridded ocean height measurements from Sentinel-6 Michael Freilich (Sentinel-6A) observations from Oct. 8-17, 2025

Sentinel-6B Continues 30-Year Legacy of Sea Level Measurements

Sentinel-6B observations will also inform early warnings and forecasts systems.

News

Dec. 16, 2025

Black-and-white VIIRS day/night bands data visualization

Earth Science Data Roundup: May 2025

A summary of datasets, products, and resources released by NASA’s Distributed Active Archive Centers (DAACs) in April 2025.

News

May 13, 2025

Solving the Data Puzzle of Sea Level Rise

The new Sea Level Change Data Pathfinder highlights the different datasets used to piece together the status and drivers of sea level rise.

Feature Article

Feb. 18, 2022

NASA, Partners Name Satellite for Noted Earth Scientist Michael Freilich

NASA and several partners are renaming a key ocean observation satellite in honor of Dr. Michael Freilich, former head of NASA’s Earth Science Division.

News

Nov. 4, 2020

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QUESTIONS & SUPPORT

Have a question?

Get help with NASA Earth science data, datasets, tools, services, and metadata on the Earthdata Forum. Experienced staff in the data user community review and answer questions.

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Poseidon-4 Radar Altimeter Resources

Poseidon-4 Radar Altimeter Learning Resources

The 2022 Hunga-Tonga Hunga-Ha′apai Eruption

The Rate of Global Sea Level Rise Doubled During the Past Three Decades

Sea Level Satellites Monitor How This Year’s El Niño Is Shaping Up

Pacific Ocean Conditions Favorable for Winter 2023/2024 El Niño Development

Satellite Observations for Analyzing Natural Hazards on Small Island Nations

Observaciones de Satélites para el Análisis de Peligros Naturales en los Pequeños Estados Insulares

An Open Ocean of Remote Sensing and In Situ Data for Science in the Cloud

Globally Averaged Sea Level

Poseidon-4 Radar Altimeter News

Sentinel-6B Continues 30-Year Legacy of Sea Level Measurements

Earth Science Data Roundup: May 2025

Solving the Data Puzzle of Sea Level Rise

NASA, Partners Name Satellite for Noted Earth Scientist Michael Freilich

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