Combining ground, atmosphere and space-based measurements to create metrology tools and frameworks to support a climate observing system able to support improved understanding of drivers of climate change.


Level 1 satellite traceability
Developing highly accurate, cost-effective, sensors for space-based climate observations, suitable for pre-and in-flight measurements, including TRUTHS and FORUM mission studies.

Atmospheric ECVs
Developing SI traceable measurement methods for bio-geophysical parameters, considering optical and Synthetic Aperture Radar sampling techniques.

Biophysical ECVs
Developing satellite-derived SI traceable measurement methods of greenhouse gas emissions and natural carbon sinks, including robust monitoring of carbon emissions reduction policies.
radiation ecvs
Radiation ECVs
Developing instrumentation and standards for traceable climate quality measurements, from surface-based networks operated by the WMO and UN.


MetEOC is an NPL coordinated series of collaborative European metrology projects supporting Earth Observation applications by establishing metrological techniques, including pre-flight calibration, post-launch on-board and vicarious calibration, and validation of higher level products.

ESA - The TRUTHS mission
September 2020 – August 2023

September 2017 – February 2021

September 2014 – August 2017

October 2011 – September 2014

These European Metrology Research Programme (EMPR) and the European Metrology Programme for Innovation and Research (EMPIR)  projects are supported by EURAMET’s European Metrology Research Programmes.