National Physical Laboratory

Fiducial Reference Measurements for Validation of Surface Temperature from Satellites (FRM4STS)

Mobile radiometric measurements being taken across the gravel plains at Gobabeb, Namibia
Mobile radiometric measurements being taken across the gravel plains at Gobabeb, Namibia


FRM4STS is an ESA-funded project, to establish and maintain SI traceability of global Fiducial Reference Measurements (FRM) for satellite-derived surface temperature product validation.

The project will facilitate international harmonisation and interoperability through organisation of a set of inter-comparisons under the Committee for Earth Observation Satellites (CEOS) and its Working Group on Calibration and Validation (WGCV).

The project objectives are:

  • To undertake comparisons to ensure consistency between measurement teams
  • To provide common descriptions and evaluation of uncertainties between measurements
  • To robustly link measurements to SI
  • To undertake experiments to evaluate sources of bias / uncertainty under differing operational conditions
  • To provide guidance and best practice information as well as access to standards and comparisons

Funding source: ESA

Contacts: Nigel Fox

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