I am doing dissertation about [predicting future urban expansion for Shannon River Basin In Ireland using CA model and arcGIS] so at this stage I would like to calculation the conversion probability factor, as it is advised that the value of this probability can be generated fixed by overlaying two land use maps, so it can see the value of conversion rate of a certain land use to other land use. so that I enter it into the model. I am kinda stuck on which arcGIS tool of OVERLAYING should I use (union, erase,identify etc), knowing that I have two landuse/landcover maps from EPA website ready with almost 32 different landuse classes for the years 2000 and 2006 and how can I actually calculate the conversion rate ?
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