DIVA - Demonstration of an Integrated approach for the Validation and exploitation of Atmospheric missions is setting-up of a pilot hub to collect, handle, archive, and exploit in a synergetic way observational data, as provided by the future integrated atmospheric composition ground-based network infrastructure, for the validation of ESA and Copernicus missions. Current advances in atmospheric composition measurements from space require access to independent, high-quality, global atmospheric composition ground-based data for the validation of the upcoming European EO missions and payloads S3, S5p, ADM-Aeolus, EarthCARE, S4, S5, MERLIN, GOME-2c, 3MI. To address the societal benefits and scientific objectives set forth by the missions, the downstream services and GEOSS, coordinated development of synergistic ground-based measurements techniques and algorithms are needed.