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Correlation between DEM, slope, and aspect

Question asked by eaelupus on Mar 14, 2018
Latest reply on Aug 20, 2018 by Dan_Patterson

I am building a suitability regression for a tree plantation.  Like many things related to flora, elevation, slope, and aspect are important variables for growth and thus site selection.   However, I am trying to wrap my head around how each of these can be used if 2 (slope and aspect) are derived from the 3rd (DEM).  Is this analytically acceptable?  Is there a way to account for the correlation and the error which must propagate?  


Any advice, opinion and insight is welcome.