Glossary for Geospatial Science

TIN object:  A TIN, or Triangulated Irregular Network, object represents a continuous surface as a set of conterminous triangles computed from irregularly spaced 3D points.  TIN topology is more restrictive than the topology of other coordinate data objects; every node is part of some polygon, every polygon is a triangle, and every triangle satisfies the Delaunay criterion.  (See also: Delaunay criterion.)