A Comparative Analysis of Dinsar Results Achieved by the Sbas and Spinua Techniques: the Maratea Valley Case Study, Italy

We compare the results of two independent synthetic aperture radar differential interferometry (DInSAR) approaches to slope instability investigations in the Maratea valley (Southern Italy), based on different processing methods and software. The area selected for the comparison is well ground truthed and provides suitable examples of movements ranging from mm to cm per year. The DInSAR analyses are based on the Small Baseline Subset (SBAS) and Stable Point INterferometry over Unurbanised Areas (SPINUA) techniques. Both methods are applied to SAR images acquired by the ERS-1/2 satellites in the period 1992-2000. Despite the differences in the data processing and minor discrepancies between the displacement maps, mainly due to differences in data classification and thresholding, the results obtained from the two techniques are largely comparable and provide very similar ground surface motion information that leads to a clear distinction between stable and unstable areas and between the zones with different velocity of movement. Figure 1. Location map of the study area in Southern Italy. The inset shows a shaded relief DEM of the Maratea valley (in the centre) affected by slope movements.