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This question is an exact duplicate of:

I am using SAR image and SNAP tool to extract water bodies. Followed the below link ( http://www.un-spider.org/advisory-support/recommended-practices/recommended-practice-flood-mapping/step-by-step) and could extract the water bodies successfully.

However, the problem what I am facing is along with the water bodies, standing water with crop fields are also extracted.

How can that be avoided?

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marked as duplicate by Kersten, Fezter Apr 12 '18 at 4:52

This question was marked as an exact duplicate of an existing question.

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Using Sentinel-1 data a flooded rice field is pretty much indistinguishable from any other water body.

If you want to stick to Sentinel-1 data and process it with SNAP you could exploit the fact that rice fields are only temporarily flooded.

  1. create the water mask for multiple satellite images on different times of the year

  2. create a stack of water masks and only keep the pixels that are masked as water in all/most images

This way you can differentiate permanent from temporary water bodies.

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