Open geospatial environmental data, like that provided by the European Union Copernicus Programme, greatly benefit the economy, the environment and society. But how much and how far can these benefits be measured? With the goal to support improvements in the valuation of Copernicus Sentinels missions (and other Earth observing missions) end-use benefits, ESA is hosting a workshop to allow multidisciplinary discussions and sharing of experience among experts from different domains.