Using spaceborne radar platforms to enhance the homogeneity of weather radar calibration Accurate weather observations are the keystone to many quantitative applications such as precipitation monitoring and nowcasting hydrological modelling and forecasting climate studies as well as understanding precipitation driven natural hazards (i.e. floods landslides debris flow). Weather radars have been an increasingly popular tool since the 1940s to provide high spatial and temporal resolution precipitation data at the mesoscale bridging the gap between synoptic and point scale observations. Yet many institutions still struggle to tap the potential of the large archives of reflectivity as there is still much to understand about factors that contribute to measurement errors one of which is calibration. Calibration represents a substantial source of uncertainty in quantitative precipitation estimation (QPE). A miscalibration of a few dBZ can easily deteriorate the accuracy of precipitation estimates by an order of magnitude. Instances where rain cells carrying torrential rains are misidentified by the radar as moderate ...