Virtual station

A virtual station consists in the intersection of a satellite track with a water body, making it possible to pick up the successive water levels at each pass of the satellite.

Sources
da Silva, Joecila, Stéphane Calmant, Frederique Seyler, Otto Filho, Gerard Cochonneau, and Webe Mansur. (10/2010AD) 2010. “Water Levels In The Amazon Basin Derived From The Ers 2 And Envisat Radar Altimetry Missions”. Remote Sensing Of Environment 114: 2160-2181. doi:https://doi.org/10.1016/j.rse.2010.04.020.