SoMMet stands for Soil Moisture Metrology. It was a Joint Research Project carried out under EURAMET's European Partnership on Metrology programme.

The figure below illustrates how SoMMet connected soil moisture measurements across scales: from sensors measuring a small volume of soil, through cosmic-ray neutron sensing (CRNS) covering larger field areas, to satellite observations at kilometre scales.

To establish metrological traceability, point-scale sensors were calibrated in laboratories specialising in temperature and humidity metrology, while CRNS instruments and their digital-twin models were characterised and validated using neutron metrology. Simulations, soil sampling, reference measurements and field comparisons then provided the basis for harmonising and combining soil moisture data across spatial and temporal scales.

18 partners · 11 countries · 36 months · 3 test field sites · 8 public deliverables

The project 21GRD08 SoMMet has received funding from the European Partnership on Metrology, co-financed from the European Union's Horizon Europe Research and Innovation Programme and by the Participating States.

Funded by the European Union. Views and opinions expressed are however those of the author(s) only and do not necessarily reflect those of the European Union or the granting authority EURAMET e.V. Neither the European Union nor the granting authority EURAMET e.V. can be held responsible for them.