The GCS is currently active in two large-scale scientific instruments or tools that have proven their effectiveness also for new Earth Observation remote sensing missions. These are the Valencia and the Alacant Anchor Stations, which are mainly dedicated to the validation of low spatial resolution remote sensing data and products. Both Anchor Stations are located in relatively large, reasonably homogeneous areas, with similar land uses, but with really different climatic conditions (annual rainfall of 450 mm in the area of the Valencia Anchor Station, VAS, in the natural region of Plana de Utiel-Requena, and only about 250 mm in the area of the Alacant Anchor Station, AAS, in the natural region of Vinalopo Mitja). The VAS belongs to the University of Valencia and the AAS belongs to the Consellería del Medio Ambiente, but is managed by the GCS.