In the S-57 Chart Data model, the object is divided into the feature object and the space object. A feature object is an object that has a real-world entity other than Position Info, has attributes, but does not have Geometry Info. Spatial object refers to the object with real world entity Position Info. Spatial object contains Geometry Info and can have attributes, which is mainly used to describe the spatial position characteristics of the entity. The geometry and position of a feature object is determined by its relationship to one or more spatial objects, i.e., the feature object must be located with reference to the spatial object.

The reference of the feature object to the space object embodies the Topology of the chart. The Topology of chart describes the spatial characteristics of real-world entities, that is, the reference information of feature objects to spatial objects. ENC product specification stipulates that ENC data must create Topology at the level of chain nodes for space objects. The SuperMap chart adopts the Topology of link node level. In the link node topology mode, the spatial object includes three types: isolated node, connecting node and edge. The isolated node and connecting node are point-like, and the edge is line-like. Each edge must start and end with a connecting node, and closed edges use the same connecting node. Point feature objects reference isolated or connected nodes, and line and area feature objects reference connected nodes and edges to determine their spatial position and shape.

provides the function of Topology check and Build Topological Relationship construction. This section will introduce the specific contents related to chart Topology in detail:

Executive summary:

This paper introduces the contents of chart Topology check and the specific operation of Topology check.

The specific operation of the Chart Data Build Topological Relationship is introduced.