PostGIS 1.5.8 Manual - Fedora Project Packages GIT repositories

PostGIS 1.5.8 Manual32 / 310Given geometry a, where the I(a), B(a), and E(a) are the Interior, Boundary, and Exterior of a, the mathematical representationof the matrix is:Interior Boundary ExteriorInterior dim( I(a) ∩ I(b) ) dim( I(a) ∩ B(b) ) dim( I(a) ∩ E(b) )Boundary dim( B(a) ∩ I(b) ) dim( B(a) ∩ B(b) ) dim( B(a) ∩ E(b) )Exterior dim( E(a) ∩ I(b) ) dim( E(a) ∩ B(b) ) dim( E(a) ∩ E(b) )Where dim(a) is the dimension of a as specified by ST_Dimension but has the domain of {0,1,2,T,F,*}• 0 => point• 1 => line• 2 => area• T => {0,1,2}• F => empty set• * => don’t careVisually, for two overlapping polygonal geometries, this looks like: