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|TanDEM-X Science Service System|
|Title||Investigations of Polarimetric and Interferometric Properties of Different Types of Land Surfaces using TerraSAR-X data|
|Investigator||Hajnsek, Irena - German Aerospace Center (DLR), Microwaves and Radar Institute|
|Summary||The objective of the project is the characterisation of different types of land surfaces with polarimetry and interferometry. The methods are adapted to the different types of land surfaces.
For agricultural surfaces a model based decomposition of polarimetric data into the scattering processes is applied in a first step. The scattering processes are surface, dihedral and volume scattering. The model yields information about the geometric and dielectric properties of the three components. From the dielectric properties of the ground soil moisture can be derived in a second step.
With multi-baseline data and interferometry forest height can be determined. This is of great importance to for ecological modelling and forest inventory.
Another interesting PolInSAR application is the identification of point-like scatterers - so called coherent scatterers - in urban environments. Coherent scatterers are deterministic scatterers located at different heights within the "urban volume" and can be identified by using spectral correlation of individual or multiple images.
A further application of PolInSAR is the characterisation of ice which acts as a volume scatterer (even at L-band) and has a strong dependence of the interferometric coherence on polarisation coherence. With an appropriate decomposition model depth and structure of ice can be investigated.
Hence dual polarimetric and also multi-baseline data are required to retrieve the characteristic parameters of different types of land surfaces.
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