Grass GIS r.to.vect: Prevent neighboring cells with equal values from being unified

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I've got different satellite image bands as GRASS rasters, which I want to convert to vector dataset. As I want to compare the IDs of the cell polygons later on, the neighboring cells with coincidentally equal values should NOT be unified to one polygon like this:



Is there a way to prevent this case? I can't use the '-v' flag to use raster values as categories since I just need the unique IDs later on.



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