For two graphs G₁(V₁, R₁)  and  G₂(V₂, R₂)

where

2D-PIR distance based on distances of component relationships.

For two 2D-PIRs R_s,1 = (t₁,xp₁,yp₁)  and  R_s,2 = (t₂,xp₂,yp₂)