Sign up for NPL updates
Sign up for NPL updates

NPL and UKRI investment for innovation in time resilience, dissemination and application.
Funding of up to £4.7 million available through joint initiative, call for applications now open.

Earth observation, climate and optical

TRUTHS satellite calibration mission

NPL in space

Improving Earth observation data to drive improved climate change modelling

TRUTHS is a climate mission, led by the UK Space Agency (UKSA), which will be delivered by the European Space Agency (ESA) to enable in-flight calibration of Earth observation (EO) satellites. TRUTHS will help deliver improved confidence in Earth Observation data gathered from space and the forecasts driven by this data.

TRUTHS stands for Traceable Radiometry Underpinning Terrestrial- and Helio- Studies and will enable upgrade of the performance of the EO system, both in space and on the ground. The  mission aims to enhance by an order of magnitude, our ability to estimate the earth’s radiation budget through direct measurement, establishing an SI-traceable reference data set which can be used to cross calibrate other satellites and improve overall data quality from the EO system.

TRUTHS - An introduction


TRUTHS will allow rigorous testing of model forecasts to support decision-making on climate adaption strategies. The  mission will enable a 10 fold improvement in accuracy of EO data, which will, in turn, drive a halving of the time required for climate scientists to make unequivocal determinations of changes to the earth’s temperature. The mission provides 'benchmark'  measurements with uncertainties small enough that future change, from a background of natural variability, can be detected in as short a time as possible.

Contact us

Missions goals

Satellite calibration

Learn more about TRUTHS

Mission development 

Lean more about earth observation and climate measurement at NPL

Work with us

Our research and measurement solutions support innovation and product development. We work with companies to deliver business advantage and commercial success.
Contact our Customer Services team on +44 20 8943 7070