I interpolated the age of minerals for the Inner Tien Shan mountains (Kyrgyzstan) using the ArcGIS tool "spline with barriers". I use ~ 200 points for my interpolation. The barrier that I use is a fault map (polylines, green in example). For my further interpretations, I would like to estimate the quality of my interpolation. At the moment I am using the point density for this purpose, but this is only correct for regions where no barriers are (see example below).
Is there a solution, where I can calculate the point density with taking my barriers into account or are there maybe different approaches to estimate the quality of my interpolation?
Here D1,D2 and D3 have all the same point density of 36.5%, whereas my interpolation quality is different in each region.