The National Physical Laboratory (NPL) attended Cheltenham Science Festival and demonstrated how satellites can be used to observe the Earth’s surface. As one of the UK’s most prestigious and popular science festivals, the event was an ideal setting to explain the work of NPL, and to give the public the opportunity to see the Earth from a new perspective. An annual celebration of science Each summer, Cheltenham Science Festival holds six days of talks, practical demonstrations, debates and experiments. Speakers this year included Richard Dawkins, Alice Roberts and Jim al Khalili; and visiting institutions included the BBC and GCHQ, alongside NPL. Volunteers from NPL manned a stand at the Festival to demonstrate satellite Earth observation and spectroscopy to members of the public. A …

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NPL’s Joanne Nightingale is currently serving as an invited Science Advisory Panel (SAP) member for Alberta’s Environmental Monitoring, Evaluation and Reporting Agency (AEMERA) and recently attended a SAP meeting in Edmonton, Canada, to review the current science implementation strategy.

The CEOS-WGCV-IVOS meeting in Toulouse, France, was attended by more than 40 world experts from space agencies and associated industry across the globe, with additional attendance remotely via the internet. NPL was well-represented, with Nigel Fox chairing the Infrared and Visible Optical Sensors (IVOS) subgroup, and Javier Gorroño presenting work on using pseudo-invariant calibration sites for TRUTHS and work on the Sentinel-2 uncertainties. The RadCalNet working group also met during the IVOS week, where Tracy Scanlon presented her uncertainty analysis for the USA’s RadCalNet site.

Scientists from NPL’s Earth Observation, Climate and Optical (ECO) group have recently installed the Cryogenic Solar Absolute Radiometer (CSAR) at the Physikalisch-Meteorologisches Observatorium Davos / World Radiation Center (PMOD/WRC) in Switzerland. CSAR was developed in close collaboration with PMOD/WRC and METAS (NMI Switzerland). As a cryogenic radiometer, CSAR provides a direct link to the International System of Units (SI), and offers a much-reduced measurement uncertainty compared to the current standard. During the WMO International Pyrheliometer Comparison (IPC XII) CSAR was measuring Solar Irradiance alongside the existing World Standard Group (WSG) which currently provides the worldwide radiometric reference scale for Solar Irradiance measurements.

NPL’s Joanne Nightingale was an invited presenter at the University of Edinburgh seminar series in GIS, Remote Sensing, and Geo-Informatics that was organised by the Edinburgh Earth Observatory in conjunction with the Association for Geographic Information, Scotland. The seminar covered work carried out within the TREES (TRaceability in tErrestrial vEgetation Sensors and biophysical products) group at NPL, and was attended by postgraduate students and industry professionals across Edinburgh.

Tracy Scanlon visited the Railroad Valley RadCalNet site, Nevada. She accompanied a team from the University of Arizona who utilise the radiometric test site for the vicarious calibration of instruments on-board satellites. The methods used in both measuring the site and propagating the surface measurements to Top-of-Atmosphere will aid in developing a robust and complete uncertainty budget for the site.

B. Gutschwager, E. Theocharous, C. Monte, A. Adibekyan, M. Reiniger, N.P. Fox, J. Hollandt of PTB and NPL have their paper ‘Comparison of the radiation temperature scales of the PTB and the NPL in the temperature range from -57 °C to 50 °C‘ published in Measurement Science and Technology. S. Mekaoui and G. Zibordi of JRC have their paper ‘Cosine error for a class of hyper-spectral irradiance sensors‘ published in Metrologia. F. Olschewski, A. Ebersoldt, F. Friedl-Vallon, B. Gutschwager, J. Hollandt, A. Kleinert, C. Monte, C. Piesch, P. Preusse, C. Rolf, P. Steffens, and R. Koppmann of PTB and BUW have their paper ‘The in-flight blackbody calibration system for the GLORIA interferometer on board an airborne research platform’ published in Atmospheric …

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