In recent years, some new technologies have been applied to dam deformation measurement, offering unprecedented opportunities to safety management and structural analysis. Among these, Areal Deformation Measurement techniques from terrestrial (Terrestrial Laser Scanning and Ground-Based InSAR) and spaceborne (InSAR) sensors may provide the chance to extend the observed region to a large portion of a structure, instead of merely measuring a set of a few control points. GNSS techniques have reached a consolidated maturity for dam deformation monitoring, either for the periodical measurement of networks, and for the implementation into continuously operating systems. Research in the field of data processing is still ongoing, especially for the robust solution of geodetic networks. Eventually, the development of sensor networks and methodologies for data integration has offered the opportunity to analyze different observations in a spatial and temporal context.