On a corridor, you can specify and edit the values of subassembly target objects, such as surfaces, alignments, and profiles.
Targets are required when the geometry of one or more of an assembly’s subassemblies requires corresponding surface, offset, or elevation targets for defining that geometry.
A few subassemblies even use pipe networks as target objects. When a corridor contains subassemblies that use targets, the object names of the intended target objects must be mapped from the subassembly definition to the corresponding drawing objects. This task is referred to as setting targets or mapping targets.
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. For example, a subassembly ‘SideSlope’ parameter is used to define roadside grading, starting from the edge of shoulder, and sloping at a specified grade, until it intercepts with an existing ground surface. In the subassembly, references to the target surface are made by calling a surface object named ‘TargetDTM.’ However, when you create the corridor, and apply the subassembly to a corridor definition, there may not be a surface named ‘TargetDTM’, and there may be multiple ground surfaces. Therefore, after the assembly is applied to the corridor, you need to map the target name (TargetDTM) to an actual surface object name.
Typically, subassembly parameters that can use a target object to define a width or an offset can use the following types of objects to define that width or offset: alignments, polylines, feature lines, or survey figures.
Similarly, subassembly parameters that can use a target object to define an elevation can use the following types of objects to define that elevation: profiles, 3D polylines, feature lines, or survey figures.
Subassemblies that can use a target object to define a surface can only use a surface object to define that surface.
As previously mentioned, a few subassemblies allow you to use pipe network objects as targets, such as the TrenchPipe subassemblies.
The following table summarizes these capabilities:
| Target Type | Object types that can be used as targets |
|---|---|
| widths or offsets | alignments, polylines, feature lines, or survey figures Note: Polylines, feature lines, and survey figures can be selected from xrefs.
|
| elevations | profiles, 3D polylines, feature lines, or survey figures Note: 3D polylines, feature lines, and survey figures can be selected from xrefs.
|
| surfaces | surfaces |
| pipe networks | pipe networks |
The Help topic for each subassembly lists the parameters in the subassembly that can be associated with a target object.
Corridor Targets in Xrefs
Objects in xrefs can be selected as corridor targets. Supported objects that can be selected are 2D and 3D polylines, feature lines, and survey figures. To select an object in an xref, attach the xref to the drawing that contains the corridor. Then when you are selecting the corridor targets, you can select the objects in the xref either graphically or by layer.
