slide 58

Temporal decorrelation refers to changes in the properties of scatterers in a pixel during two sub-acquisition times. The time interval between these times is called the temporal baseline. The differences in scatterer properties cannot be reduced by interference. For example, the surface changing from buildings to bare soil will cause changes in land objects. It is important to avoid using a side image with a long temporal baseline, especially in vegetated areas or forests where the structure can change second by second. Coherence and optical images can show regions with low decorrelation, which are usually vegetated areas. For the temporal decorrelation, it means the properties of the scatterers in the pixel change during two sub-acquisition times. Note that the time interval between two sub-acquisition times is called the temporal baseline. The difference properties of the scatterers means the spaces of random components are different. So the interference cannot reduce this. Such as example is the surface changing from buildings to bare soil. Because land objects are more likely to change if the temporal baseline is longer, we shouldn't use a side image with too long temporal baseline. In particular, vegetated area or forest is subject to temporal cortical relation because the structure of vegetation or forest canopy are even different second by second. You can see the coherence and optical images. The low decoherence regions are vegetated.