Tunnel segments

Dialog box

The Tunnel segments operation reduces the amount of intermediate points within segments in a segment map. The segments of the input map are copied into a new segment map. However, for every three consecutive intermediate points within a segment, the middle one is omitted if it falls within a user-defined tunnel-width. Redundant nodes can also be removed.

Dialog box options:

Input segment map:

Select an input segment map. Open the list box and select the desired input map, or drag a segment map directly from the Catalog into this box. No special input map requirements.

Tunnel width:

Type a value for the tunnel width in meters (real value >= 0). If a tunnel width of 0 is specified, no tunnelling is performed. For more information, see also Tunnel segments : functionality.

Remove superfluous nodes:

Select this check box if you want to remove superfluous nodes from the segment map (recommended). Clear this check box if you want all existing nodes to remain.

Output segment map:

Type a name for the output segment map that will contain the copied segments.

Description:

Optionally, type a description for the output map. The description will appear in the status bar of the Main window when moving the mouse pointer over the map in a Catalog, and in the title bar of a map window when the output map is displayed. If no description is supplied, the output map will use its own definition as description.

When you click the Show button, the dependent output map will be defined, calculated and shown. When you click the Define button, the dependent output map will only be defined; if necessary, the map will be calculated later, for instance when the map is opened to be displayed.

See also: