For the interferometric analysis during the period 1993-2010, the entire available archive of ERS-1/2 and ENVISAT data for the area of interest from both descending and ascending orbits was used.

Descending orbit (period 1993-2010)

For the interferometric analysis performed with data acquired by satellite from a descending orbit (track 208), 141 satellite images were used for the period May 1993 - September 2010; Figure 1 shows the distribution of these data in the perpendicular time/baseline plane (orbital separation). In particular, the black and red rhombuses represent the ERS-1/2 and ENVISAT data, respectively.
Table 1 shows the main characteristics of the dataset used.

Figure 1 - Distribution in the time/baseline-perpendicular plane of SAR ERS-1/2 and ENVISAT data acquired from descending orbits and related to the area of interest. The black and red rhombuses represent the ERS and ENVISAT data, respectively.

Table 1 - Main characteristics of ENVISAT SAR data used for descending orbits

Ascending orbit (period 1995-2010)

For the interferometric analysis performed with data acquired by satellite from an ascending orbit, 76 satellite images (26 ERS-1/2 and 50 ENVISAT) were used for the period June 1995 - October 2010, whose distribution in the perpendicular time/baseline plan is shown in Figure 2, where the black and red rhombuses represent the ERS-1/2 and ENVISAT data, respectively. Table 2 shows the main characteristics of the dataset used.

Figure 2 - Distribution in the time/baseline-perpendicular plane of SAR ERS-1/2 and ENVISAT data acquired from ascending orbits on the area of interest. The black and red rhombuses represent the ERS-1/2 and ENVISAT data, respectively.

TTable 1 - Main characteristics of SAR ERS-1/2 ed ENVISAT SAR data used for descending orbits