An elevation model will be automatically created in the background by the creation of sections and layouts, by unfolding irregular-shaped structures and by calculating deviations from a reference plane.

Each of these three tools are applied by selecting the area of interest by means of a clipping box. This clipping box is divided in three parts: the upper, the lower part and a red dotted line that seperates the upper and lower part of the clipping box

The upper and lower parts of the clipping box can be defined visually or by introducing the corresponding height in the Job Editor/ Clipping parameters.

The red dotted line represents the projection surface. The elevation model is computed based on the direction of the red arrow, i.e. the projection direction of the section to be processed. In the elevation model options the method/algorithm through which the model is computed can be changed.

If the elevation model is set on **“None”**, the elevation
is set to zero.

**Minimum** – the elevation model will be calculated
according to the minimum Z-value.

**Maximum** – the elevation model will be calculated
according to the maximum Z-value.

**Arithmetic mean** – the elevation model will be calculated
as the arithmetic mean of all points.

**Minimum/Maximum mean** – the elevation model will be
calculated as the middle value between the maximum and minimum z-value.

Setting the elevation model to Minimum or Maximum is particularly useful when calculating Digital Terrain Models or Digital Surface Models. Higher objects, such as vegetation and man-made structures, can be excluded or included from the computation.