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I have clipped forest area from an image and apply NDVI classification on forest area and in the remaining, I have done unsupervised classification.

So, I want to know after NDVI and unsupervised classification, how do I mosaic or merge them to get a single classified image for further processing?

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You can merge raster bands into single image (with 2 bands) using Composite Bands tool. But is still unclear to me why do you need to do that. If you want to do mathemathical operations with raster's cell values - use Raster Calculator.

The other approach is:

  1. Convert your raster classification results to vector format.
  2. Use overlay tools.

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