TOPEX/POSEIDON: Satellite Altimetry Crossover Points for Ocean Circulation
Description
TOPEX/POSEIDON, a joint NASA-CNES satellite launched in 1992, provides highly precise sea level observations with altimeter accuracy better than 2 centimeters. The dataset contains crossover point files derived from Merged Geophysical Data Records, with over a hundred parameters per point for analyzing ocean currents, tides, and climate effects. It was a core element of the World Ocean Circulation Experiment and Tropical Ocean and Global Atmosphere programs.
Use Cases
Modeling basin-wide ocean current variations based on precise sea level measurements.
Studying the climatic impact of major currents like the Gulf Stream based on altimeter data.
Analyzing ocean tides and waves based on satellite radar altimetry observations.
Investigating marine geophysics and wind patterns based on crossover point parameters.
Strengths
Provides highly precise measurements with altimeter accuracy better than 2 centimeters and orbit accuracy better than 3 centimeters.
Covers 90% of ice-free oceans from 66°N to 66°S latitude, observing all major straits.
Contains over a hundred parameters per crossover point for detailed analysis.
Limitations
Column-level documentation is absent; field semantics must be inferred after download.
Row count is unknown, which may limit suitability assessment.
Last update date is unknown; freshness unverified.
Provenance
Source
NASA Earthdata (SCIOPS), derived from AVISO Merged Geophysical Data Records of the TOPEX/POSEIDON mission.
Collection Method
Computed from satellite radar altimetry, microwave radiometer, and precise tracking systems (DORIS, laser retroreflector, GPS).
Time Range
Mission launched August 10, 1992, with a nominal 3 to 5-year operational period.
Freshness
Data originates from a mission launched in 1992 with a nominal 3-5 year lifespan; temporal coverage is not specified in the input.
Geography
Global coverage from 66° North to 66° South latitude, covering ice-free oceans and major straits.
Data is considered research data; analysis software is the responsibility of the user.