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Envisat Extension Orbit – Update

41.8N 12.4E

October 28th, 2010 Category: Earth Observation, Events

ESA Envisat-1

The Envisat mission was launched in March 2002 for 5-year nominal lifetime. Consequently the on-board hydrazine capacity was designed for a 5-year duration operation. Careful management of the satellite orbital manoeuvres allowed saving enough hydrazine for operating nominally Envisat for an additional 3.5 years, i.e. until end 2010.

The operations of the Envisat satellite beyond end 2010 require modifying the orbital characteristics of the mission. Careful trading between all possible options led to the selection a new orbit, called the “Envisat Extension Orbit“, which allows:
1) operating the mission for an additional 3 years, with a minimum amount of hydrazine,
2) ensuring the continuity of the maximum number of Envisat applications, with the exception of ASAR interferometry which will be degraded.

The Envisat extension orbit will be implemented through an altitude decrease of 17.4 km which will be reached through different orbital manoeuvres starting on 22 October 2010.

Consequently, the Envisat data flow will be suspended during the period 22 October to 01 November 2010. The data flow will resume on 02 November 2010.

The Envisat mission represents an important goal in the field of Earth Observation. Chelys will follow the entire operation attentively, as we are also the real time image generation software (Miravi) provider for the Meris sensor. This post will be updated in the next few days in order to provide a preview of the Envisat images at the end of the maneuver as soon as its sensors are reactivated.

Update

The last OCM (Orbit Control Manoeuvre) finished in time without problems on October 26th. The satellite instruments are gradually resuming their nominal condition and the dissemination to the users is started. However the ESA disclaimer is clear: users are invited to discard such data until November 2nd, 2010 as they are destined only for the ESA internal verification.

We started generating the first images using the “new” data, and the results, despite some geolocation problems, are very promising. Here below are some images generated after the completion of the manoeuvre.

Argentina from Andes to Ocean (ASAR Image Mode)

Richat Structure in the Sahara Desert (MERIS Full Resolution)

France, Spain and Pyrenees (MERIS Full Resolution)

Strait of Gibraltar (MERIS Full Resolution)

POLinSAR 2009, The 4th International SAR Workshop

December 3rd, 2008 Category: Earth Observation, Events

The 4th International Workshop on Science and Applications of SAR Polarimetry and Polarimetric Interferometry - POLinSAR 2009

The European Space Agency is organising POLinSAR 2009, the 4th International Workshop on Science and Applications of SAR Polarimetry and Polarimetric Interferometry, which will be hosted in ESRIN, Frascati, Italy on 26-30 January 2009.


Objectives

The main objectives of the workshop are to:

  • Provide a forum for scientific exchange and to initiate and encourage close collaboration between individual research groups
  • Exploitation of spaceborne missions
  • Present new results from the latest studies in the field and to assess the state-of-the-art
  • Present polarimetric and interferometric results from ALOS PALSAR, RADARSAT-2 and TerraSAR-X
  • Assess the available Pol-InSAR tools and datasets
  • Review the bio-geophysical parameters that can be retrieved and their accuracy
  • Make recommendations for algorithm development and new products, future missions and applications
  • Report on progress/status of recommendations of PolInSAR 2007

The workshop will focus on theory and methods in the fields of SAR Polarimetry and Polarimetric Interferometry around the following theme:

  1. SAR Polarimetric Interferometry (Pol-InSAR)
  2. Theoretical Modelling
  3. Applications of SAR Polarimetry
    • Land: Forest, Agriculture, Environment (Urban, global change, land cover), Wetlands
    • Ocean: Pollution Monitoring, Ship detection, Ocean Parameters Retrieval, Sea Features
    • Cryosphere: Snow, Land Ice and Sea Ice Monitoring
    • Hazards: Fire Monitoring, Volcanoes, Flooding, Earthquake
  4. Polarimetry and Persistent Scatterer Interferometry (PSI)
  5. Compact Polarimetry
  6. ALOS PALSAR, TerraSAR-X, RADARSAT-2, COSMO-SkyMed results
  7. Future Spaceborne missions for Pol-InSAR
  8. Airborne Pol-InSAR campaigns
source ESA

ALOS Symposium 2008

August 17th, 2008 Category: Earth Observation, Events

ALOS Symposium 2008The 2008 Joint PI Symposium of the ALOS Data Nodes follows the First Symposium, held in 2007 in Kyoto, Japan. The event, organised by ESA in cooperation with JAXA, ASF, GA and GISTDA, will be held on the island of Rhodes, Greece, from 3 to 7 November 2008.

The Symposium will offer a forum to exchange views on technical and scientific issues on the data exploitation. It will provide updates of the satellite status and will allow to present the progress in recent research of ongoing projects.

More ...

2nd Meris/(A)ATSR User Workshop

August 3rd, 2008 Category: Earth Observation, Events

2nd Meris/(A)ATSR User WorkshopThe European Space Agency is organising its second joint MERIS and (A)ATSR workshop, which will be hosted at ESA ESRIN in Frascati, Italy from 22 to 26 September 2008.

Chelys will attend the event presenting the work done in the field of the satellite image processing: MOSRI, a Real Time Mosaics generation system.

ESA meets increasing demand for Earth observation data

July 31st, 2008 Category: Earth Observation

2007 Envisat Symposium in Montreux, Switzerland

2007 Envisat Symposium

Earth observation satellite data have never been in more demand than today as missions have demonstrated their ability to enable better understanding and improved management of the Earth and its environment.

ESA is meeting this demand by providing additional data, serving large science programmes, enlarging network stations and making more data available in near-real time.

Responding to calls from ESA’s Principal Investigators (PI), the agency has released some 20 Announcement of Opportunity (AO) calls over the last decade that allow access to Earth observation (EO) data from ESA’s ERS-1, ERS-2, Envisat, Earth Explorers and Third Party Missions.

As a result, more than 1500 scientific projects for research and applications development have been accepted and are receiving data free of charge.

More ...

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