Most appropriate interpolation method?

Discussion created by slepk002 on Mar 15, 2012
Latest reply on Mar 29, 2012 by curtvprice
    I have a map of a number of modern sites that are used as comparisons for a fossil site.  They are all plotted with x,y,z coordinates, with the z being a measure of the 'distance' between that modern site's environment and that hypothesized for the fossil site.  My colleague plotted the points out in SAS using a joining linear interpolation, and we are trying to figure out the best way to plot this in ArcMap so that the results can be displayed on a map.  We basically need to connect regions with the lowest z values, then those with the next lowest, etc, with interpolation between our points.
Any thoughts on which techniques would be the most appropriate?  We first thought the global polynomial, but that doesn't look at all like our stats results.
Thank you so much for any advice...