Altimetry and Doris applications in videos

Credits Cnes
  • Videos for the 20 Years of Progress in Radar Altimetry (2012): key dates in the Earth and Ocean observations, applications, see how this continuity of 20 years of research is one of the fundamental reasons for the success of satellite altimetry.
  • Download the video (8'30", 82 Mo)
(Credits Cnes, Mira Productions).
  • Doris, the space surveyor: serie of videos produced by Cnes on the occasion of the 20th anniversary of the Doris system in 2010. Learn more about the technics: how does Doris measure to the closest centimetre, about the network of stations and about the applications ranging from operational oceanography modelling to climate studies.

Doris, the space surveyor (.mpeg, 5'13'') How does Doris work : illustration of the principle of the Doppler effect. Main applications in geodesy, geophysics, or ocean levels.
Doris, autonomous navigation (.mpeg, 1'24'') Precision of the Doris system,  real-time on-board orbit determination Diode.
Doris, network of stations (2'01'') view on the network of the 60 stations spread across the globe. Control, maintenance of this network.

(Credits Cnes, Mira Productions).
  • "Altimetry applications in videos" produced by Cnes on the occasion of the Jason-2 launch in 2008, traces the many fields where this technique is involved: El Niño, the mean sea level, Venice, the ocean circulation, the Mediterranean Sea, operational oceanography, the oil spills, the maritime transport and safety, biology, the fishing management, the tsunamis, the monitoring hurricanes, hydrology (Aral Sea, lake Chad, rivers). Click on each title to see short video footages and further information to monitor the Earth pulse.
El Niño
El Niño and La Niña are well-known climate events occurring in the tropical Pacific Ocean. On the eve of the launch of Jason-2, what more can we learn about these phenomena?
Mean sea level
Altimetry satellites are a crucial tool for observing variations in mean sea level. With greater quantities of data, we are able to confirm trends, and attempt to mitigate their effects.
Aral Sea
Satellite altimetry is an efficient tool in monitoring the level of enclosed seas, lakes and even large rivers. Since 1991, the Aral Sea is flown over - or was overflown - by a serie of altimetry satellites that measure the two seas antagonistic fluctuations.
Venice
The city of Venice has suffered assaults from the sea for many years. By improving the quality and quantity of altimetry measurements, the Jason-2 satellite will contribute to its protection.
Oil spill
The contribution of satellites to the detection, monitoring and forecasting of oil drifts has been demonstrated. Thanks to synergies between stakeholders, a continuous monitoring procedure is about to become operational in certain pre-defined areas of interest.
Transport and security
The ocean is a challenging environment for sailors. Satellite altimetry is an important source of data for sea state forecasting models.
Life in the ocean
The ocean is very fertile. By combining biological data with circulation models it is now possible to simulate the complex interactions between ocean physics and chemistry and marine life.
Fishing management
Sustainable management of marine resources is important given the enormous stakes involved. The launch of the Jason-2 in June 2008 will contribute to this effort by providing a physical description of the oceans.
Mediterranean Sea
Observations of the Mediterranean sea by means of in situ or satellite measurements are essential for monitoring, forecasting and managing it.
Tsunamis
Tsunamis are huge waves which can result in devastating waves breaking on the shore. By measuring sea surface height, altimetry satellites can theoretically detect tsunami waves in open ocean.
Monitoring hurricanes
Cyclones are intense meteorological phenomena that get their energy from the ocean's heat. Altimetry satellites have made a significant contribution to the prediction of trajectories and intensities by collecting data on sea surface height, wind speed and wave height.
Hydrology
Although initially developed for studying ocean surfaces, satellite altimetry rapidly broadened its scope to include monitoring the levels of continental waters.
Lake Chad
Lake Chad's large surface in a topographical setting with low relief makes it an excellent object for study using altimetry satellites.
Ocean circulation
Because the currents transport heat and energy, they are major players in the Earth's climate. Observations by altimetry, combined with in situ surveys, give us a precise view of them, both at the surface and at depth.
Operational oceanography
The new Jason-2 altimetry satellite complements the constellation of satellites currently in flight, and provides Mercator Ocean with a resolution that is ideal for improving ocean forecasting in coastal areas, and for modelling smaller-scale phenomena.
Waves forecasting
By integrating satellites and in situ measurements in meteorological models, we can determine and forecast the sea state as well as the wave height at a global scale.
Seasonal forecasting
By integrating oceanographic and meteorological data in models, it is possible to describe major seasonal trends several months in advance.
Offshore activities
The launch of the OSTM/Jason-2 satellite, on June 2008, makes new data available, improving operational systems for ocean forecasts and marine meteorology and thus contributing to the safety of people and property in all offshore activities.
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