2.5D

From zweieinhalbdimensional (short: 2 ½ D, 2 ½ -D or 2,5 D ), it is called with data models, in which the third dimension is not stored fully valid with respect to the 2D position information. Rather, the third dimension is only available as an attribute of the two-dimensional modeled objects. The term is, inter alia, used in geographic information systems and the design of databases.

For example, in digital elevation models usually the terrain elevation is modeled as a function of position. For each 2D position coordinate is only one height value in the model. Vertical walls, overhangs, cavities, tunnels, and bridges can be in such a model does not incorporate, as there are in reality points of various heights above the other. To put that in spite of a 3D model ( it is the position and height models ) not all 3D shapes are modeled, the term 3D by using 2.5D is weakened.