The Gas data model contains the following two topologies:
- Gas network topology — Built from the node feature class GA_POINT and the edge feature class GA_LINE. A gas point can be related to a site (FID_SITE).
- Control cable topology — Built from the node feature class GA_C_POINT and the edge feature class GA_C_LINE. A cable point can be related to a site and to a control cabinet (FID_SITE, FID_CONTROL_CABINET).
The node and edge geometry feature classes are stored in the Topology topic.
Gas network topology. Network points are connected with lines. Network points must not lie on a network line.
Achieving a Valid Network Topology
The topology requires that network points always lie at the start or end of a network line. A network point must never lie on a line. If you insert a network point on a network line, the line must be split at the insertion point. The consistency of the topology is maintained by feature rules.
If a network point is removed, the connecting lines must be merged.
For more information, see Split Lines and Extract Points from Lines.
For more information about the feature rules, see Organization of Gas Functions and Features.