The Climateand EarthObservation(CEO)groupat NPL is a world leader in the theory,methods,and practice of metrological(measurement science)traceability ofEarthObservation(EO)instrumentation and their data products.CEO projectscover the metrology and quality assurance of satellitedata products – from the pre-flight calibration and onboard processingto the higher-level data products providing essential climate variables and other societal datasets. We also develop in-situ fiducial reference measurement (FRM) techniques for calibration and validation of satellite data products.We collaborate strongly with other teams within NPL, especially the Data Science team, and externally with a wide range of collaborators. 

Ourresearch programme in active satellitesensors(radar altimeters and related technologies)is growing rapidly, with recently wonprojects looking at the uncertainty assessmentandcharacterisation metrics for radar altimetry(including both the altimeter and the microwave radiometer)onCopernicus Sentinel 6, Sentinel3,and CRISTAL missions, along with the development ofsuitableFRMs, for oceans,inland water, sea ice and land icesurfaces. We have alsorecently started projects that consider how observational uncertainties can be used in Earth systems modelling. Weare looking to expand our efforts with suchactivesensors, and to develop new capability relating to SAR-mode processing(fully focused and interferometric)of radar altimeters. Additionally, weare keen to explore the metrological aspects of SAR itself, especially where SAR observations are complementary to our active research projects on vegetation and Nature Based Solutions.