Description
By applying the interferometric technique (PSP-IFSAR) to radar satellite data, it is possible to measure the component of the ground displacement along the satellite’s line of sight, for a series of radiometrically stable points, called persistent scatterers (PS). The data is generated through the e-Geos processing chain. By combining the measurements obtained in two different acquisition geometries using a post-processing tool, the vertical and horizontal components are extracted to obtain the subsidence rate, while projecting the displacements measured along the direction of maximum slope of the land (with the help of a DEM) it is possible to get information on coastal landslide activities.
Operating scenarios
- Base knowledge
- Ordinary monitoring
Technical specification
| Requirement | Description |
| Spatial resolution | Sensor function used Sentinel 1A IW mode: 12 mx 4 m Cosmo- SkyMed HIMAGE: 3 mx 3 m |
| Coverage area | Sensor function used Sentinel 1A IW mode: 50 km x 50 km Cosmo- SkyMed HIMAGE: 10 km x 10 km |
| Geographic accuracy | Sensor function used Sentinel 1A IW mode: 12 m Cosmo- SkyMed HIMAGE: 1.5 m |
| Information Age | 4 months |
| Measurement uncertainty | Sensor function, number of images and time period Sentinel 1A IW mode, 30 images, 2 years: 2 mm / year Cosmo- SkyMed HIMAGE, 30 images, 2 years: 4 mm / year |
| Measurement / projection unit | mm / year geographical reference system |
| EO data in input | PS data obtained from satellite data processing Sentinel 1, Cosmo- SkyMed |
| Input data used | NA |
| Data used for validation | NA |
| Algorithm method | Breakdown of motion based on observation geometry |
| Format | Ascii files |
| Refresh rate | 4 months |
Example – subsidence rate
Example – Subsidence EW
Example – Subsidence VERT
