Topological Relationship Editing
Definition
Topological relationship editing ensures that spatial features obey rules about how they connect and share boundaries—no overlaps between parcels, roads connect at nodes, polygons share edges, and gaps are prevented. Editing tools allow snapping, splitting, merging, and validation against rule sets. Topology preserves logical consistency across complex datasets so analyses like routing, area accounting, and adjacency work correctly.
Application
Cadastral mapping maintains parcel fabric; utilities manage touching pipes and valves; transportation departments enforce connectivity; and conservation planners maintain non-overlapping habitat zones.
FAQ
Why is topology preferable to mere visual alignment?
Visual alignment can hide micro-gaps and overlaps that break analysis. Topology stores shared edges explicitly and validates relationships continuously.
How do you manage edits in multi-user environments?
Use versioning and conflict resolution; lock small areas during critical operations; and run automated topology checks on save.
What rules commonly catch parcel fabric errors?
No overlaps, no gaps, must share boundaries with neighbors, and closed rings for all polygons; additional checks enforce right-of-way adjacency.
How should tolerance be set for snapping?
Large enough to capture intended joins given data precision, but small enough to avoid unintended merges—document and standardize per dataset.