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It seems to be a question not so related to GIS, that is since you are treating the raster as a "list" (or a vector) of values. Anyhow you can use the following workflow in R: Assume you have raster objects called r1 and r2. >r1Vals<-getValues(r1);r2Vals<-getValues(r2) # Extract values of r1 and r2 cells to verctors ...


After some research I came across a very promissing statistical approach: the Rand index. In R there are various implementations (package mclust & flexclust) - I will work them through in the next days and hopefully can deliver more information on the topic in a while.

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