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Ocean Surface Topography from Space
DATA



OSTM/Jason-2 GPS based orbit near real time sea surface height
OSTM/Jason-2 GPS based orbit
Near Real Time along track Sea Surface Height residuals
SARAL/AltiKa Near-Real-Time along track Sea Surface Height residuals
SARAL/AltiKa
Near-Real-Time along track Sea Surface Height residuals
Global Mean Sea Level Trend
MEaSUREs Global Mean Sea Level
globally-averaged sea level, every 10 days.
MEaSUREs Gridded Sea Surface Height Anomalies
MEaSUREs Gridded Sea Surface Height Anomalies Interim (Near Real TIme) v1609
1/6 degree, 5 day grids, about 1 week old. Will be superseded by the "final" version.
MEaSUREs Gridded Sea Surface Height Anomalies
MEaSUREs Gridded Sea Surface Height Anomalies Final v1609
1/6 degree, 5 day grids, a few months behind real time.
MEaSUREs Multi-Mission Ocean Altimeter Data for Climate Research complete time series Version 4
MEaSUREs Multi-Mission Along Track Ocean Altimeter Data for Climate Research v4
along track sea level residuals above a mean sea surface, a few months behind real time
Reconstructed Sea Level, 1950-2009
Reconstructed Sea Level, 1950-2009
Half degree, 7 day grids, 1950-Jun-16 to 2009-Jun-27, combining satellite altimetry with tide gages.
Sea surface topography data sets.
PO.DAAC - Sea surface topography data sets.
Other altimetric data sets
Data Providers icon
Data Providers - Partner agencies who provide data from NASA and other altimeter missions.



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

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