Convert Polyline to Alignment |
This command allows one to convert a drawing’s polyline into a horizontal alignment with all its analytical information. The result may have straight sections and circular curves but may never have clothoids.
The program initially launches following dialog box, whose features are described in detail below.
Name: Identifier the alignment to be created.
Station: Alignment’s initial station.
Length: This control provides information on the total length of the polyline selected.
Speed: The average speed of the road to be defined is entered. This value will later influence the superelevation’s generation. Depending on the road’s speed, one or other superelevation table will be used.
Category: The category best adapted to the road to be created according to the Road Instructions is entered. Depending on this value and the Speed, the program will use one or other superelevation table to generate the superelevation.
Insert curves between lines: The program can be made to automatically include circular curves between two consecutive lines. In the event that the radius specified is too large, the program uses a smaller radius.
Dimension Alignment: Finally, this option allows the command to be executed Dimension Alignment command.
Export to File: If this option is enabled, the program will request the file in which the horizontal alignment is to be saved once the dialog box has been validated.
MDT then draws the horizontal alignment in the ALIGNMENT layer, deleting the original polyline. The horizontal alignment can be checked by using the Segments > Superelevations> List Superelevations command. If an attempt is made to convert an already converted polyline, MDT will inform the user that the polyline is already a horizontal alignment.
When designing the polyline with CAD and arches are entered, care must be taken to respect the tangents between the straight line and curved sections. Otherwise, the program will indicate the poorly defined tangents and the angular error of each of them in the following list.
TcpMDT
