ABraun
2
what SAR data are you using?
Polarimetric decomposition works better when you have quad-pol data (HH HV VH VV).
This paper discusses how the parameters change with dual-pol data:
http://earth.esa.int/workshops/polinsar2007/papers/75_cloude.pdf
The decrease of information content could be due to this limited decomposition quality but also of the lower spatial resolution.
Maybe this is also helpful for you:
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