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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).

A poster introducing the Project is now available. Covering the aims, needs and work of the project as well as the forthcoming workshop. The poster is available to download from here.

The number of Earth Observation (EO) satellites is rapidly growing, whilst measurements from satellite sensors are used to answer increasingly urgent global issues, making it imperative that scientists and decision-makers be able to rely on the accuracy of EO data products.

Where long data records are required, to establish for example Climate Data Records (CDRs) such as Sea Surface Temperature (SST) and Land Surface Temperature (LST), it is essential for the data and associated measurement systems to be rigorously tied to international physical standards (Systeme International, SI) to enable:

  • Confidence in the data
    sst2

    At Sea Comparison of 3 radioameters (R/V Walton Smith, University of Miami) (Credit: P. Minnett)

  • The means to assign appropriate weights when making judgements
  • Measurement consistent and independent of the time of measurement or those taking the measurements.
  • Potential for data gaps in the observation record
  • Measurements of the same measurand to be traceable to different base units without bias e.g. Thermal and Radiometric units

Fiducial Reference Measurements

“The suite of independent ground measurements that provide the maximum return on investment for a satellite mission by delivering, to users, the required confidence in data products, in the form of independent validation results and satellite measurement uncertainty estimation, over the entire end-to-end duration of a satellite mission”
(Sentinel-3 Validation Team)

SST

Prototype FICE comparison of ISAR and M-AERI aboard the Explorer of the Seas (Credit P. Minnett)

An FRM must:

– Document evidence of its traceability to SI

– Be independent from the satellite geophysical retrieval process

– Detail an uncertainty budget for the instrumentation and measurement process for the range of conditions it is used over.

– Adhere to community agreed measurement protocols and management practises.