Objectives The topological relationship is prone to appear inconsistent phenomenon in the incremental updating of urban dual-carriageway roads.

Methods Aiming at the problem of topological conflict detection and processing between single- and dual-carriageway roads, this paper proposes a topological conflict detection and processing method based on the extended polyline-polygon four-intersection model. First, we discuss possible topological relation types and expression between single- and double-carriageway roads. Then, a spatial relation expression model including the relation between polyline and polygon, the number of common intersections and whether it is the vertex of dual-carriageway roads is designed. Finally, the topological conflict types are determined by calculating the matrix difference between the correct topological relation and the updated topological relation of single- and carriageway-roads, and the corresponding topological conflict processing rules are constructed.

Results The experiment results show that the proposed method can effectively express the topological relationship between single- and dual-carriageway roads and finish the topological conflict detection and processing very well.

Conclusions The proposed method have the advantages of good pertinence and high precision.