IRIS Segmentation guidelines

IRIS has segmentation guidelines to ensure a consistent road network.

These can be broken into four core areas

1. Road
2. Intersections
3. Elements
4. Inventory

Road

The is a simple representation of the road from start to end.

Segment Rules:

1. Start
2. End

Intersections (Nodes)

All real intersections and nodes in the network.

Segment Rules:

1. Junction Left
2. Junction Right
3. Cross Road
4. T -Junction
5. Roundabout
6. Thru Junction (LGA Boundary crossing)
7. Element Node

Element

Roads elements are used to make a symbolic representation of the road network.

Elements must have a unique "road number" / "element sequence number" pairs.

Segment Rules:

1. Start
2. Intersection
3. Carriageway split (single to dual carriageway)
4. End

Inventory

Road inventory represents the actual seal and pavement changes in the road network.

Segment Rules:

1. Start
2. Carriageway split (single to dual carriageway)
3. Seal change i.e Asphalt to Brick paving
4. Width change i.e. 5.2m to 6.3m
5. Kerbing change i.e. no kerbing to barrier kerbing
6. End