Geologic Mapping using ALOS Palsar

I have data from an specific region (ETM and ALOS Palsar1).
I want to use these datasets (both of them) for geological mapping. ETM is useful for geological unit segmentation and it is recommended for us to use ALOS data as ancillary data to combine with ETM for better results. According to the below points, what is your idea to do that?
ALOS Palsar: ALOS Palsar SLC quad pol

1- Is there any way to combine datasets in pixel level fusion to have better results?
2- Is there any way to process ALOS data to classify different regions based on their properties (such as texture, dielectric constant, polarimetry etc.)?
3- Is there any way to extract some feature from ALOS to combine with ETM for that reason?

Thanks a lot