The InSAR technique in InSAR-Based services in rural areas is frequently plagued by a signal loss in rural areas that is called decorrelation.
It occurs for instance when the ground surface changes significantly between two SAR acquisitions that are used to form an interferogram.
This could be due to high displacement rates, to the rapid growth of vegetation, or to the presence of relatively wet snow cover at the ground surface.
Fragile Srl developed specific strategies and techniques that address these particular decorrelation problems and effectively overcome them and it’s able to provide very effective InSAR-based services in rural areas.
Thanks to these strategies it is possible to obtain information of ground displacement also in adverse conditions that are characterized by the absence of man-made structures, moderate vegetation or agricultural fields.
Phenomena like landslides, but also volcanoes or rock-glaciers, that may threaten roads, adjacent buildings, buried or linear infrastructures, occur almost exclusively in areas where only rare stable scatterers are present.
Our RAINS approach was specifically designed for achieving qualitative values of displacements in these adverse conditions and it is well suited to obtain spatially almost continuous deformation maps. It is however also possible to optimize processing parameters for the MT-SBA approach in order to obtain temporally more continuous information of displacement. This may be particularly important if the temporal behavior of the investigated phenomenon needs to be studied in order to plan mitigation measures (for instance a drainage system), but it is also a good way of cross-checking the RAINS results in conditions that are really at the limit of the technical feasibility.
A bit more on technical aspects check >> Our processing strategies