Why the overlapping area become smaller for: level-0 RAW to level-1 SLC to level-2 GRD？

s1tbx
#1

and can I use level-0 RAW to calculate river flow velocity by feature matching of SAR data？

#3

截屏2023-09-17 下午5.43.13
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截屏2023-09-17 下午5.45.04
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2023-09-17 5.45.49
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#4

RAW data is so blurred you will most probably not even be able to see the river.

#5

alright, so I should change to use other satellites’ SAR data?

#6

Level-1b SLC focused images is what you should using, with all sensors, if you are interested in high resolution.

#7

OK. Does the level-1 SLC data point have precise geographical information？Is it gridded data?