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Showing Progression/Migration using yearly data?

Question asked by matthewrusso on Oct 29, 2014

I am currently working a project to determine the movement/migration of the pine beetle here in Colorado.  What I have is data from each year from 1994-2013.  I would like to show this in a map.  I want to show the most recent migration over the last 3 years but other than just coloring the layers don't really know what to do.  My Co-worker suggested that I erase 2012 from 2013 for example to show just the new growth.  My problem with this is I will be deleting data.  I thought of an elaborate select by location setup might do the trip but don't want to drop that much time into it.


Any Ideas?