Abstract: In view of the problem that there is no space entity topology for the line data and area data found in the automatic synthesis of cartography, this paper proposes a context aware method for deriving linear object entities.First, establish a spatial topology proximity to fencelines, ancillary facilities, and buildings, clustering direct neighboring groups, it is divided into three modes, namely the topological connection between the two walls, the topological connection between the wall and the building, and the topological connection between the hanging wall line near the building and buildings; Finally, the shortest path, contour and the nearest point are used to connect the three models. Experiments with Fujian province data as an example show that this method can effectively build a spatial entity topology connection, help improve automatic map synthesis, at the same time can meet the requirements of production practice, with a high degree of practicality.

Key words: entity derivation, the fence line, building, the shortest path, outer contour line