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How to find forest cover area by using eCognition software?

I'm trying to find vegetation by using NDVI in the ruleset but it takes vegetation too with the forest.

Can I use any other filter along with the NDVI to identify only the forest cover area?

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Your question depends on which kind of image are you using, which sensor and its bandwidths. Using NDVI you can try finding a threshold. If it is not enough to separate your classes you will need a more complex approach, like using multiple thresholdings or try a classification algorithm.

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