The **Plan Calculation** group provides several methods to determine where the position of the new points will be created. The fields in the **Parameters** group will change depending of the option selected.

**At Chainages - **Points are created at regular chainage intervals with a given start chainage, which is defined in the **Start Chainage** field. If the first point on the indicated feature has a chainage dimension, CHN, the dimension value will be placed into this field. The **Chainage Interval** field defines the frequency of points along the feature. Both methods of height calculation are available.

**Maximum Distance - **Points are created on each segment to ensure that a maximum length of each segment does not exceed a specified value. The value in the **Maximum Distance** field is used. New points are inserted where the segment length exceeds this value. If we take an example where there is a segment length of 9m and a maximum distance of 5m, a new point will be inserted at the midpoint of the segment, 4.5m along. Both methods of height calculation are available.

**Distance Along - **Creates a single point at a user-defined distance along the feature from the start point. The **Distance Along** field defines this value and both methods of height calculation are available.

**DTM Facet Edges - **Creates points wherever the feature intersects with a DTM triangle side. The height of points is always calculated from the DTM triangles. The DTM that is used is that specified in the **Reference DTM** combo box.

**DTM Intersection - **Creates points where the feature passes through a DTM. The height of points is always calculated from the DTM intersection point. The DTM that is used is that specified in the **Reference DTM** combo box.

**Datum Intersection - **Creates points along the feature where the feature passes through a given datum, specified in the **Datum Height** field. The height options are disabled as the height is already the datum value.

**Height Intervals - **Creates points at the intersection of the feature string and regular height intervals or contours. The **Height Interval** field defines this value. The height options are disabled as the height is already calculated.

**Number of Segments - **Creates points so that each segment of the feature is split into a number of smaller segments, defined in the **Number of Segments** field. The height options are disabled as the height for each point is always calculated by linear interpolation.

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