Fig. 1From: 2D PWV monitoring of a wide and orographically complex area with a low dense GNSS networkTotal extent of the GNSS network (a). The red rectangle corresponds to the French–Italian border region depicted in b in which the GNSS permanent stations (PSs) are denser. Common PSs are represented by red dots; net1, net2, and net3 are represented by yellow, blue, and green dots, respectivelyBack to article page