**TIN--Triangulated
Irregular Network**

A TIN is a set of triangles each with X,Y, and Z coordinates. Because the points define a plane, it is easy to interpolate an elevation at every point in the triangle from the corner coordinates. TINS have been proposed as alternatives to DEMs or grids, but they have greater storage requirement and more complicated indexing to rapidly find the triangle that covers a particular point. Virtually no TINs have been produced by mapping agencies.

*Last revision 10/9/201*7