# 2.2.4 Elevation

The Elevation command changes the elevation of track endpoints. After opening this dialog, you can click on the respective endpoint to set its elevation properties. The endpoint on which you work is indicated with a big red dot.

An endpoint can have one of several elevation types:

- None - no elevation defined.
- Defined - a defined elevation at a specified height.
- Hidden - a defined elevation but not displayed on the layout.
- Computed - height is based on height of closest neighbors.
- Grade - grade is based on height of closest neighbors.
- Ignored - endpoint is not considered in computations.
- Station - assigns a name to the endpoint.

Note: Only one of these attributes can be assigned to an endpoint. For example, an endpoint can not be defined as a Grade and a Station at the same time.

When an endpoint is selected on the layout by Left-Click, it is highlighted by a large red dot and its elevation type and values are displayed in the dialog.

Additionally, Defined Elevation endpoints are indicated on the layout by gold colored dots. Ignored Elevation endpoints are indicated by blue colored dots.

Shift+Left-Click splits the track at the specified point and adds an elevation point.

The grade at the specified endpoint is displayed next to the Grade radio button. For Defined Elevation endpoints, the grade on each side of the endpoint is displayed.

Defined Elevation endpoints are used to specify fixed heights of track endpoints. Typically, this would be where a grade changes or where clearances must be maintained. Computed Elevations and Grade markers can place between Defined Elevation endpoints. These values are not entered directly but are computed dynamically based on Defined Elevations of connected tracks. This allows labeling of elevations at intermediate endpoints without having the enter specific values. Computed markers can also placed between a Defined Elevation point and the end of a track.

Stations are used to provide information for the Profile (Section 2.2.10) command.

All Elevation labels (including Grade and Station) are drawn on the layout in outlined boxes. These may be moved by the Move Description (Section 2.2.9) command. In addition, Grade labels have an arrow indicating the upwards direction.

- 2.2.4.1 Computing Dynamic Elevations