One can specify where the height information can be taken from to generate the longitudinal profile by clicking on Source button. This source can be:
Digital Model: Indicates the current surface of the drawing. This is where the object selected to obtain the profile will be projected. This option is advisable when the model has been correctly generated, since it includes all the height and break line orientation information, enabling a precise intersection with all the elements. The file model must be selected in the Surface option of the main dialog box.
Sections file: As in the digital height model, one can indicate a previously recorded Section file (.TRM extension) using the Section File button.
Layers List: This option can be used to cut any drawing element having a height. It is very useful when working with digital mapping without the need to create large surface files. In order to do so, the cursor is pointed at the layers containing 3D elements. The digital model can also be included in the selection by marking the MDT layer. This option enables the Layers List box, from which the layers containing the 3D information can be selected.
In this latter option, if the name of the layer of an element to be considered is unknown and its position in the drawing area is known, the Select button is simply clicked. Then it goes back to the drawing mode and the program requests the corresponding objects to be selected. This operation is executed for all the objects selected.
The Save option is used when one wishes the set of layers to be saved in an ASCII file with the .CAP extension. The program displays a window entitled Save Layers List with the project directory and a proposed name for the current drawing, which can be either validated or modified. When validated, one goes back to the previous window. Once this operation has been completed, the Load button is used, as layers can be selected by simply clicking this button by choosing the layers file for jobs in any subsequent longitudinal profile or cross-section operation.
When this option is selected, the Advanced button is enabled, so that information on the objects associated to the layers is included when profiles are obtained from the layers selected in the dialog box shown below. Object heights are interpolated.
By activating the corresponding option in configuration, one can decide whether or not polylines with a height of zero are to be cut.
TcpMDT
