For nearly three decades, satellites have observed sea level change across the globe. Below are links to data from current and past altimeter missions used to understand the oceans.

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  TOPEX/Poseidon Geophysical Data Record Version F

  After an extensive effort by teams at JPL and CNES, data from the first precision altimeter, TOPEX/Poseidon, has been reprocessed to modern standards.

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  Jason-3 GPS-based orbit

  Near Real Time along track Sea Surface Height residuals

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  SARAL/AltiKa

  Near-Real-Time along track Sea Surface Height residuals

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  JPL Measures grids v2205

  This dataset provides gridded Sea Surface Height Anomalies (SSHA) above a mean sea surface, on a 1/6th degree grid every 5 days.

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  Measures along track data v5.1

  This dataset contains along track Sea Surface Height Anomalies (SSHA) for individual 10-day cycles from the TOPEX/Poseidon, Jason-1, OSTM/Jason-2, and Jason-3 missions geo-referenced to a mean reference orbit.

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  Measures GMSL time series based on along track data v5.1

  This dataset contains the Global Mean Sea Level (GMSL) trend generated from the Integrated Multi-Mission Ocean Altimeter Data for Climate Research Version 5.1.

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  Reconstructed Sea Level, 1950-2009

  Half degree, 7 day grids, 1950-Jun-16 to 2009-Jun-27, combining satellite altimetry with tide gages.

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  Data Providers

  Partner agencies who provide data from NASA and other altimeter missions.

  • PO.DAAC
  • AVISO
  • NOAA
  • RADS
  • CMEMS

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Altimeter data are used:

• As input into dynamic models for long term climate forecasting and prediction,
• To improve the knowledge of ocean tides and develop global tide models,
• To monitor the variation of global mean sea level and its relationship to changes in ocean mass and heat content, and
• To map the general circulation variability of the ocean, including the ocean mesoscale, over decades and in near real-time using multi-satellite altimetric sampling.

Other complementary data sources include sea surface temperature measurements from satellites, and in-situ measurements from buoys and drifters. For NASA's altimetry missions, taking measurements and turning them into usable scientific data products involves ground-based verification of the satellite measurements, an elaborate satellite telecommunications system for transmitting and receiving the data from its instruments, and a complex data processing effort involving two NASA centers, the French space agency, CNES, and our partners at NOAA and EUMETSAT.

Data from these missions are delivered to customers in map or digital form. Data products are generated for:

• Sea surface height
• Geostrophic velocity vectors
• Wind speed
• Wave Height