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Survey Menu. How to make a Longitudinal Profile with InnerSoft CAD for AutoCAD

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Published on Mar 15, 2012

The app will draw the longitudinal profile of a surface from an alignment. The surface may be composed by Lines, SPlines, 3D polylines, Arcs, Ellipses, Circles, triangular 3DFaces or planar quadrangular 3DFaces, planar 2D polylines or planar LW polylines. These elements must have an elevation or height in AutoCAD (a 3D terrain).

Set Alignment

The alignment may be a Line, SPline, 3D polyline, Arc, Ellipse, Circle, planar 2D polyline or planar LW polyline. Polylines can be composed by different element types (straight segments and arcs).
The alignment can be defined by two ways:
• By Points: alignment will be defined taking points on the AutoCAD screen (at least two points).
• By Objects: Select on AutoCAD screen the Line, SPline, 3D polyline, Arc, Ellipse, Circle, planar 2D polyline or planar LW polyline that defines the alignment.
If you select an AutoCAD object as alignment, the beginning of the alignment coincides with the starting point of the AutoCAD object; anyway, you can press button Reverse Alignt. if you want to change the direction of the alignment. Polyline alignments can contain arcs. The object that defines the alignment cannot belong to the terrain objects selection.

Press Get Alignment button to define it. Reverse Alignt. button will reverse the alignment direction. So, final point will become the starting point, and starting point will become the final point. Update Alignt. button will refresh all the information about all those alignments defined by an AutoCAD object. So, if you moved or edited the AutoCAD object, just press this button to update the information. Anyway, every time you compute the profile, the application will automatically update the alignment information.

Set Surface

Press Add Objects button to add AutoCAD objects to the surface selection. You can add objects by steps. You can also delete objects from the table by selecting them in AutoCAD: press Remove Objects ACAD button. You can also remove objects from the table by selecting the rows in the table and pressing Remove Objects Table button. At any time, you can check the selection of objects by highlighting them in AutoCAD. To remove all the objects, press Empty Table button. Press Select All button to select all rows in the table.

To start computing the longitudinal profile, you must enter the surface and the alignment in the desired order.
Compute Longitudinal Profile
This button computes the section that the alignment produces in the terrain/surface. In addition, the app draws a 3D polyline profile (NOT for curve elements).

The data table will show the following information:
• Index point.
• X coordinate of the point.
• Y coordinate of the point.
• Z coordinate of the point.
• Number of the element to which the point belongs (Id. Element).
• Partial Projected length between consecutive points (Partial Abscissa).
• Projected length of each point with respect to the origin of the Element to which it belongs (Abscissa on Element).
• Cumulative projected length of each point with respect to the Alignment origin (Abscissa on Alignment).
• Real length between consecutive points, measured along the profile (Partial Real Length).
• Real cumulative length of each point with respect to the origin of the profile: the profile length measured from the point in question until the first intersection point (Real Length along Profile).
• Partial Elevation Difference between consecutive points (Elevation Difference).
• Partial Tangent between consecutive points: tangent of the straight line that joins them (Partial Tangent).

Draw Auxiliary View

You can also draw a section on the XY projection plane (auxiliary view) using different fold line for each elements of the alignment. The fold line of each partial section will have the elevation of the lowest point of intersection that has been found for that segment.
In the next image you can see the auxiliary view of a longitudinal section: the axis is the magenta line, the terrain is drawn of gray polylines, green lines are auxiliary verticals and the auxiliary view of the longitudinal section of the surface is the red polyline.

Draw 2D Profile

App will asks for a point in the AutoCAD screen from which to draw the longitudinal profile with all the data of the table.

Export data to Excel
Export to a Microsoft Excel sheet all the data of the table.
Compute Profile by Interval

If you check “Compute Profile by Interval” box, a profile by intervals will be computed as well as the longitudinal profile.

The length of intervals must be introduced into the corresponding input box that appears in the form. From the beginning of the alignment, app will get section data by intervals (cyan lines in the image below). Then will draw in AutoCAD the longitudinal section of the surface (red polyline in the image below), and the longitudinal section computed by intervals (blue polyline in the figure below).

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