I'm trying to create something like a cellular automaton land cover change model using QGIS, in which cells randomly change land cover based on probabilities determined from various input rasters. I've already have a map of probabilities of conversion, and I need to take the next step.
I found this question, Randomly altering raster map of habitat types?, which looks very similar to what I want to do. The suggested approach is to use a Markov chain or probabilistic cellular automaton, and the commenter writes: "The transitions can be implemented using Map Algebra statements, which makes this method practicable in any raster-based GIS, even those without direct or quick access to cell-level data."
Can anybody tell me how to do probabilistic map algebra in QGIS or one of its extensions? I don't see any probability tools in the Raster Calculator.
Failing that, is there a tool that will simply generate random rasters to be later combined using the Raster Calculator?