TOPOLOGY

Topological Parcel Networks

One of the most important rules in the cadastral survey system is that there needs to be a basic layer or network of land parcels wherein overlaps and gaps are not allowed because it would lead to conflicting or ambiguous rights over the same piece of land. This is a topological rule and topology is used as the means of maintaining a network that complies with this basic requirement.

There are other layers or networks that have different topological rules - eg overlaps and gaps are allowed in some well defined circumstances. The rules applying to a particular parcel are defined by two parcel attributes: status and topology class. Refer Parcel Status and Parcel Topology Classes

Topological parcel networks are characterised by the twin attributes of parcel status and the topology class. Topological rules define how parcels are joined within a network and between overlapping networks. The most important parcel network is the live primary network. All parcels in this network have a status of live and a topology class of primary.

Parcels with a topology class of None are not spatially represented and have no topology definition. Therefore they do not form parcel networks.

Topology
Boundary Observations vs Boundary Lines
Accuracy of Boundary Toplogy
Parcel Dimensions
Topology vs Geometry
Geometry in Landonline
Role of Topology in Landonline
Parcel Status
Toplogy Line Layers
No Topology Layer
Primary Layer
Secondary Layer
Tertiary Layer
Parcel Topology Classes
Primary Parcel Networks
Provisional Primary Network
Approved Primary Network
Live Primary Network
Unregistered Gazette Primary Network
Strata Parcel Networks
Provisional Strata Network
Approved Parcel Network
Live Strata Network
Unregistered Gazette Strata Network
Secondary Parcel Networks
Tertiary Parcel Networks
Historic Parcel Networks