Can I use SAR images for detecting groundwater and groundwater polution? If someone did that before can he or she give me some tips or help?
Thank you 
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Unfortunately, this is practically impossible at the moment. If you are interested in moving in this direction, I recommend to look throw the theoretical foundations of ground penetrating radar. Despite the fact that sensing is usually performed from the ground surface, researchers face a huge number of limitations of the method.
In addition, the reliability of GPR data without reference boreholes is extremely weak.
For example: https://www.researchgate.net/publication/318296301_Ground-Penetrating_Radar
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Thank you very much, I know about GPR or georadar I stud geophysics, but I want to try to detect a groundwater with satelite but from your replay I see that is very hard or impossible.
At least you can use satellite information to narrow down the presence of groundwater: https://www.austriaca.at/buecher/Open%20Access/GI_Forum/GI_Forum_2015___8211__Geospatial_Minds_for_Society/3_11_10185_FP_Wendt_10.pdf
Hi,
Have you looked at the AHP method for potential groundwater detection?
Mustafa