The main goal of this thesis involves the development of a refined methodology toseparate the mass change signals associated with glacial isostatic adjustment (GIA)from those of surface ice/firn by exploiting the strengths of independent data sets,such as those from gravimetry, altimetry, climate data, and others. To achieve this,various research efforts were conducted addressing specific aspects of the methodology and subsequent data processing. This led to a number of new contributions to the topic,Physical and Space Geodes