4.4 SLIDE Vectors Topological Relations

• Binary Topological Relationships

  • Logical - Return TRUE or False about the spatial relationships between two objects defined by ordered sets of points - (typically points,lines,polygons)

  • Fig 4.2 graphic discussion view in book code

    • Symmetrical relationships

    • function(x, y) is true, function(y, x) will also be true, 

      • equals, intersects, crosses, touches and overlaps

    • When order of x.y is important - not symmetrical

    -   contains, and within

Fig 4.2 Topological Relations between vector geometries