About IVOS

IVOS is the Infrared and Visible Optical Sensors Subgroup of WGCV, the CEOS Working Group on Calibration and Validation.

IVOS is chaired by Dr Nigel Fox of the UK’s National Physical Laboratory.
Contact: Optical Radiation Measurement Team, NPL, Hampton Road, Teddington, Middlesex TW11 0LW, UK.


The IVOS Mission
To ensure high quality calibration and validation of infrared and visible optical data from Earth observation satellites and validation of higher level products

Terms of Reference
The objectives of the Infrared and Visible Optical Sensors subgroup, beyond those of the WGCV, are to:

  • Promote international and national collaboration in the calibration and validation of all IVOS and, thus, to assist in the improved application of data from satellite sensors
  • Address all sensors (ground based, airborne, and satellite) for which there is a direct link to the calibration and validation of satellite sensors
  • Identify and agree on calibration and validation requirements and standard specifications for IVOS
  • Identify test sites and encourage continuing observations and intercomparison of data from these sites
  • Encourage the preservation, unencumbered and release of data relating to calibration and validation activities including details of pre-launch and in flight parameters

Action Plan
The subgroup activities are at present focussed towards the development of a strategy to establish improved data quality to meet the needs of the Earth Observation community as coordinated through GEO. 

This strategy is likely to involve the establishment and recommendation of “best practise” for the calibration and validation of EO sensors both at sensor level (pre-flight and in-flight) and associated vicarious calibration/validation techniques.  It will also seek to identify a set of reference test sites which can be “certified” and form a basis for cross-comparison activities.

The group is therefore working to identify current activities of the EO community, existing protocols, reference test sites etc and also opportunities for collaboration to improve efficiency and synergy between the international community.   

An early success in this plan was the agreement by CEOS plenary to encourage the use of a “reference standard” solar irradiance spectrum.

The group seeks to meet at least annually and encourages new members who can contribute to the groups activities. 


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