In Civil 3D, a 2D breakline lacks elevation data and is considered what type?

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Multiple Choice

In Civil 3D, a 2D breakline lacks elevation data and is considered what type?

Explanation:
When a breakline has no elevation data, it cannot impose a vertical change along its length. In Civil 3D, such 2D breaklines are treated as proximity breaklines. They refine the surface triangulation based on how close the triangles are to the line, not by enforcing a specific elevation along it. This is useful for features where the line defines a boundary or edge in plan view, but the elevation is determined elsewhere. If you were to assign elevations along the breakline, it would then behave as an elevation breakline, enforcing a defined elevation change along the line. So, a 2D breakline without Z values is categorized as a proximity breakline.

When a breakline has no elevation data, it cannot impose a vertical change along its length. In Civil 3D, such 2D breaklines are treated as proximity breaklines. They refine the surface triangulation based on how close the triangles are to the line, not by enforcing a specific elevation along it. This is useful for features where the line defines a boundary or edge in plan view, but the elevation is determined elsewhere. If you were to assign elevations along the breakline, it would then behave as an elevation breakline, enforcing a defined elevation change along the line. So, a 2D breakline without Z values is categorized as a proximity breakline.

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