Match accuracy to use
Planning maps and excavation records may require very different positional confidence.
Use layers with ownership
A map should identify source, date and responsible organization.
Link map objects to asset records
Spatial and maintenance data are more useful when they refer to the same stable identifier.
Do not infer hidden infrastructure from a schematic
Approximate maps should be clearly labelled and never treated as field locating information.
Scope. This page explains asset-management concepts, not operating procedures for critical infrastructure. Inspection methods, intervention thresholds and safety decisions must follow the asset owner’s standards, local rules and qualified professional judgement.