Envisat

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The ENVISAT Mission Status and update
Ola Grabak ESA/ESRIN
20 April 2004
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ENVISAT mission phases since launch
Initial Operations Phase
450 served projects
Gradual opening of services and products to users
Release of Atm. Chemistry L2 products
Release of RA2 / AATSR / MERIS Level 2 products
Release of ASAR products
Data distribution to Cal/Val teams
Sep 03
Feb 04
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ENVISAT Mission Some numbers

• 10 000 orbits celebrated January 28, 2004
• Largest European satellite largest worldwide EO
  satellite - unique combination of 10
  instruments
• 77 different types of data products generated on
  a daily basis
• 140 Gigabytes of data products generated per day
• ASAR HR instruments operated with an average of
  15 min./orbit

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ENVISAT Mission Health status

• All service module elements working nominally
• Solar arrays show excellent performance providing
  power levels above expectations and panel
  degradations below the specifications
• Only 25 of the hydrazine (fuel) has been
  consumed, indicating a satellite life expectancy
  beyond the nominal 5 years. In the best case,
  this could mean operations until 2010-2011.
• Excellent performance by the gyroscopes is
  ensuring that the satellite pointing well inside
  specifications
• All instruments (except MIPAS) are working
  nominally

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ENVISAT 10 ways to monitor the Earth
ESA Developed Instruments ASAR Advanced
Synthetic Aperture Radar MERIS Medium
Resolution Imaging Spectrometer GOMOS Global
Ozone Monitoring by Occultation of Stars MIPAS
Michelson Interferometric Passive Atmospheric
Sounder RA-2 Radar Altimeter 2 MWR Microwave
Radiometer LRR Laser Retro Reflector Announceme
nt of Opportunity Instruments AATSR Advanced
Along Track Scanning Radiometer SCIAMACHY
Scanning Imaging Absorption Spectrometer for
Atmospheric Cartography DORIS Doppler
Orbitography and Radio-positioning Integrated by
Satellite
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ENVISAT Imaging Radar
ENVISAT ASAR Operation Modes
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C-19 iceberg monitoring in Antarctica (from May
to October 2002)
Generated using browse images
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ENVISAT and Antarctica ship rescue operation
Envisat ASAR wide swath Antarctica July 2002
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Synergy between ENVISAT imaging instruments
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Small low pressure system in Mediterranean
Sea (26 June 2002)
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ASAR Global Monitoring Mode

• 400 swath, 1 km resolution
• Form part of the background regional mission,
  I.e. it is acquired in chase of no ASAR HR
• HH over
• Antarctica
• Artic (above 70 deg. latitude North)
• - Greenland
• - Labrador Sea and North of Canada.

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ENVISAT Mission Data downlink
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ASAR / MERIS products generation
Production of on-request products
MERIS FR
ASAR HR
Number of distributed products
2003
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Envisat ASAR 37 High Rate sub-modes
What are the modes and sub-modes requested by
ASAR users ?
Statistics over 9 months (January to September
2003)
BRM Calibration requests excluded
The most requested sub-modes are those used by
the Background Regional Mission (BRM)
but 94 of projects also requested other modes
than ERS-like and WS, VV
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ENVISAT Mission Scientific projects

• 425 current active scientific projects receiving
  Envisat data
• Results from these projects will be presented at
  the forthcoming Envisat symposium in August.
• To learn about the results from the projects, go
  to http//eopi.esa.int/

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ASAR Acquisition priorities
ASAR Background Regional Mission
Acquisition priorities defined by the High Level
Operation Plan
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From the Envisat web site (http//cat.envisat.esa
.int)
On-line ordering for archived ASAR and MERIS data
available On-line ordering for ASAR and MERIS
planning foreseen during first quarter 04
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Envisat Data Software tools

• The Agency has prepared a number of software
  tools available in source code to facilitate the
  utilization of Envisat data
• - BEST (Basic ERS Envisat SAR Toolbox) Version
  4.0 has been delivered to ESA in March 2004 and
  is under acceptance testing. Version 4.0 includes
  ASAR specific calibration functions and several
  additional functions supporting the
  interferometric community.
• - BEAM (Basic ERS Envisat AATSR and MERIS
  toolbox) Version 2.2 is the current version. A
  new version is expected in July 2004 with
  improved geometric corrections and enhanced
  mosaicking tools for Full Resolution data.
• - BEAT (Basic ERS Envisat Atmospheric Toolbox)
  Version 3, including the visualization interface,
  shall be released in April 2004.
• These are freeware that ban be downloaded from
  the ESA web site

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Envisat Data costs

• Cat 1, Set by ESA
• 25 euro per ASAR and MERIS FR scene (10 euro for
  medium resolution images)
• 10 euro for the MERIS reduced resolution
• GMM and Wave Mode free from ftp server
• Programming fee for ASAR and MERIS is 80 euro for
  the first 60 seconds and then 15 euro for each 15
  seconds
• Details on http//eopi.esa.int
• Cat 2, prices set by ESA to the Distributing
  entities
• Reduction of price for archived data
• Increase in programming fee

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http//envisat.esa.int
eohelp _at_ esa.int
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