_____________ are objects that prevent TIN lines from crossing them. This type of object is used to establish an edge within the surface by aligning TIN lines along it that otherwise would have crossed that location were this entity not in place.

_____________ are objects that prevent TIN lines from crossing them. This type of object is used to establish an edge within the surface by aligning TIN lines along it that otherwise would have crossed that location were this entity not in place.

• A. Breaklines
• B. Boundaries
• C. Contours
• D. Fence Lines

Answer: (A)

Breaklines are used to control how a TIN surface triangulates by creating edges along a given linear feature. When the surface is built, breaklines are treated as constraints that the triangulation must follow, so the triangles align with the line and do not cross it. This preserves the shape and elevation of features like roads, curbs, or streams and creates a defined edge where the surface would otherwise cut through. Boundaries merely set the overall extent of the surface, contours are elevation lines that don’t constrain triangulation, and fence lines define boundaries but don’t impose internal edge alignment in the same targeted way breaklines do.

Breaklines are used to control how a TIN surface triangulates by creating edges along a given linear feature. When the surface is built, breaklines are treated as constraints that the triangulation must follow, so the triangles align with the line and do not cross it. This preserves the shape and elevation of features like roads, curbs, or streams and creates a defined edge where the surface would otherwise cut through. Boundaries merely set the overall extent of the surface, contours are elevation lines that don’t constrain triangulation, and fence lines define boundaries but don’t impose internal edge alignment in the same targeted way breaklines do.