hi,
I have just started my journey with Sentinel-data.
at present my aim is to identification of water bodies using sentinel data using open source GIS tools.
I need your valuable suggestions and guidelines in this…
–AJAY
You could calculate some indices like NDWI or others. 
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Check the IdePix processor.
It is in the menu at Optical / Preprocessing / Masking / IdePix.
It’s available for Sentinel-3 OLCI and Sentinel-2 MSI.
It provides a LAND flag. So where you don’t have land, you have water.
After starting the processor, first it seems that it is not responding but after a while you see progress.
Currently the documentation is not yet complete. Please ask if you have further questions
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thnq Mr. Marpet
let me try with it
With “Band Maths” (on right-click over my layer - or Raster > Band Maths) it could possible to perform Calculations as per the user choice.
In SNAP-5.0 version, common sort of indices are available to perform.
refer: Optical > Thematic land Processing or Thematic Water Processing
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hI abgbaumann,
How a alone with a single band is enough for computations of NDWI, NDVI!
A single band will not be enough to compute such indices.
The D means Difference and with a single band you can’t compute a difference.
To detect water bodies on a single band you can you a threshold. But this will not be very accurate.