[Send to a friend] [Print] Radar altimetry: 15 years of progress 28 March 2006 The international symposium on “15 years of progress in radar altimetry”, organized by CNES and Esa, reviewed the key advances made possible by altimetry satellites. More than 500 scientists from 60 countries presen ...Read more
From ship to satellite [Send to a friend] [Print] Until 30 years ago, voluntary observing ships were the only way to gather data about the oceans. While it is easy to see that satellites give us a bird's eye view for global observations, it is harder to imagine how they can help to refine analy ...Read more
Altimetry theory [Send to a friend] [Print] Altimetry measurements are acquired by an altimeter on a non-synchronous satellite in a repeating low-Earth orbit designed to fly over the same points at regular intervals. The altimeter is a radar instrument that emits a signal at very high frequenc ...Read more
[Send to a friend] [Print] From altimetry to operational oceanography Variations of sea surface-level Surface topography varies on several scales of time and space. Satellite altimetry is capable of measuring these variations globally and almost instantaneously with centimetre accuracy, all ...Read more
[Send to a friend] [Print] Charting and forecasting ocean conditions 12 June 2008 Satellite altimetry is the only space-based technology capable of penetrating below the ocean surface. This capability will benefit a broad rang ...Read more
[Send to a friend] [Print] Altika A high accurate oceanography altimeter Satellite radar altimetry is a technique used in oceanography to measure sea level on a large scale. The data obtained is vital to understanding ocean circulation and its variations. The AltiKa project, which was develope ...Read more
[Send to a friend] [Print] SARAL/AltiKa to enhance understanding of Earth's climate 30 January 2013 The French-Indian SARAL/AltiKa altimetry mission is scheduled to launch 25 February from the Satish Dhawan Space Centre in southern India. Its goal is to enable closer monitoring of sea-surface ...Read more
[Send to a friend] [Print] A leap forward for oceanography 3 June 2008 Over the last 15 years, altimetry satellites have been poring over the oceans in every detail, collecting more data in 10 days than could be gathered over ...Read more
How altimetry works [Send to a friend] [Print] Observation of the oceans most certainly began when the first mariners set out to sea. To begin with, observations would have been concerned with finding the best trade routes. Subsequently, as each new discovery by explorers raised new questions, ...Read more
[Send to a friend] [Print] Nearly 50,000 measurements per day How altimetry works The radar altimeters on the satellite send very short impulses, which are reflected by the ocean's surface. Measurements of the time that it takes for the return trip permit to calculate the distance, or range ...Read more
[Send to a friend] [Print] Successful French-US cooperation Satellite altimetry, a French centre of excellence The Topex/Poseidon programme reflects CNES's expertise in satellite altimetry over nearly 30 years. Starting in 1968-69, French researchers submitted proposals for an altimetric sa ...Read more
[Send to a friend] [Print] Topex/Poseidon takes its final curtain call 9 January 2006 The curtain has come down on the Topex/Poseidon satellite altimetry mission. After nearly 13 years in orbit studying ocean phenomena, the joint French-U.S. satellite has now handed over to its successor Jason ...Read more
[Send to a friend] [Print] Jason-2 takes to the air 7 may 2008 [The Jason-2 satellite. Crédits : CNES, juin 2005/Illust. D. Ducros] [/img/ 2008/imageZoom.gif] The Jason-2 satellite. Crédits : CNES, juin 2005/Illust. D. Ducro ...Read more
Charting ocean currents [Send to a friend] [Print] Mariners have studied ocean currents to find the best routes since ancient times. Benjamin Franklin was the first to chart the Gulf Stream in 1777, by measuring sea temperatures. He recommended following this warmer current to reduce trip time ...Read more
[Send to a friend] [Print] Jason-2: watching sea level and weather 20 May 2008 Satellites monitor sea level, wave height, wind speed and current movements from space. Like its predecessors, Jason-2 will obtain all these data ...Read more
[Send to a friend] [Print] From experimentation to operational oceanography Origins of the project US scientists proposed the first satellite altimetry observation projects in 1965 at a seminar in Athens, Greece. The programmes were inaugurated in 1975 with the US GEOS 3 satellite, followed ...Read more
Observe, understand, predict [Send to a friend] [Print] The significant advances made in the last 30 years have been made possible largely by new means of satellite- and ground-based observation, and by new processing techniques. Since the 1990s, an in-situ observation system has been set up i ...Read more
[Send to a friend] [Print] CryoSat all set to monitor sea ice 23 August 2005 [/img/2008/imageZoom.gif] Like the ocean, glaciers and sea ice play a key role in climate processes, so we need to monitor them. Europe's CryoSat satellite is set for launch this autumn to observe the cryosphere and ...Read more
[Send to a friend] [Print] DORIS The space surveyor In 1666, Jean-Baptiste Colbert, adviser to Louis XIV, ordered the French Royal Science Academy to establish and update geographic maps. Defining a coherent system of measurement therefore became a royal priority, and the metre was designated ...Read more
[Send to a friend] [Print] Jason 1 and 2 The ocean observatory The oceans are a vital element of our planet's equilibrium, occupying 70 % of the surface of the globe. Ever-changing, they are subject to influences from solar radiation, wind and atmospheric pressure at the surface, exchanges of ...Read more
Accents, capital letters as well as words with no proper meaning (the, that, of, a, etc.) will not be taken into account. The engine uses stemming search (horse equals horses, documentation equals documents and vice versa). Words beginning with a capital letter will be considered as proper nouns.
Refine your search:
The terms suggested to refine your search are important words from the first documents resulting from your search.
The link "Refine your search from this document" enables you to identify the most relevant documents and launch a new search taking them into account.
If the terms you use for your search include words in a foreign language, select this language to enable a better lexical analysis of your demand, hence better results.
|AND :||The resulting documents will respond to both terms.|
|OR :||The resulting documents will respond to one of the terms.|
|NOT :||The resulting documents will only respond to the word on the left.|
|XOR :||The resulting documents will respond to one of the words but not to both.|
|( and ) :||Allows you to use a group of words.|
|+ et - :||The resulting documents will respond to all the terms preceeded by + and to no term preceeded by a -. Example: +horse -car|
|NEAR :||The resulting documents will include both terms separated by no more than 10 words.
Exemple: horse NEAR car
|" " :||Allows to search for an exact sentence.|
|* :||Wildcard: Attention, the use of this sign may slow down your search.|
The following prefixes enable you to limit your search to some characteristics of documents. The word has to follow the prefix immediately, with no space between them. You can combine these prefixes with any kind of classic keyword search.
|"title:" :||The word following this prefix will be part of the document's title.
|"filetype:" :||This defines the type of document that will respond your search.
The available types of documents are: txt, csv
|"language:" :||This defines the language used in the documents that will respond your search. The available languages are: fr, en