Department of Signal Processing and Acoustics

MetEOC4 project (2020-2023)

Metrology Research Institute is involved in project MetEOC4 - "Metrology to establish an SI-traceable climate observing system".

The overall goal of this project is to build on the outputs of previous projects (EMRP/EMPIR and others funded by EU and ESA for example) to create the metrology tools and framework needed to underpin a global climate observing system. This project is the follow-up of the EMPIR MetEOC3 where Metrology Research Institute (MRI) was contributing to develop a gonoreflectometer for the measurement bidirectional reflectance distribution function (BRDF) of sand of reference sites.

One of the objectives of the project is to upgrade and validate the open-source radiative transfer software Eradiate (originally specified in the MetEOC-3 project and operationally implemented through a project with ESA). Radiative Transfer models are used to simulate the interaction of light with the atmosphere and with complex real-world surfaces. Eradiate was developed to implement RT-model simulation and validation using modern, evolved software and computational technologies. To validate the new models and code so that it can be trusted and applicable for EO product calibrations, it requires a thorough validation against SI-traceable reference samples. This task will compare the new software’s RT models against actual measurements of appropriately designed, produced and characterised artificial targets. MRI will contribute to design and testing the properties of these 3D printed targets. The RT code simulated multi-angular reflectances will be compared with the measured multi-angular reflectances (BRDF measurements). The ultimate goal is to establish SI-traceability for new RT simulation software and ensure its suitability for EO calibrations.


Contact persons: Farshid Manoocheri and Robin Aschan

More information can be found at the project website:

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