# Glossary for Geospatial Science

### Technical vocabulary defined by MicroImages

**Glossary**

**TIN elements:** TNTmips TIN objects contain four element types: nodes, edges, triangles, and hulls. Nodes are the most fundamental element of a TIN and the only element type that references spatial coordinates (x,y,z). An edge is an oriented line segment that connects two nodes. Three edges connect three nodes to form a triangle that satisfies the Delaunay criterion. Triangles represent elementary areas of the surface that describe topological relationships between all other elements of the TIN data. A hull represents the area covered by a TIN structure. Interpolation of z-values is only valid within a hull region.