Cleanup graph

You can use the Cleanup graph tool for fast cleanup of graph networks by merging nodes, merging segments, and creating nodes at intersecting segments.

Often imported, merged, or self-drawn graph networks may contain the following issues:

• Duplicate or close-by nodes
• Duplicate or close-by segments
• Intersecting segments that do not have nodes where segments intersect

These graph networks produce a number of problems when creating street shapes or extracting lots.

You can run the Cleanup graph tool in the following ways:

• Click the Cleanup graph tool .
• Click Graph > Cleanup Graph from the main menu.

Note:

This tool operates on a selection of graph segments. Unselected segments stay unchanged. When merging, the nodes of the selected segments are merged.

Cleanup graph settings

The checked operations (intersect, snap, merge, and resolve shape conflicts) are run one after another. The following options can be set:

Option	Description
Intersect Segments	When checked, creates a new node at the intersection of segments.
Snap Nodes to Segments	When checked, nodes snap to segments. Note: Nodes with smaller street widths always snap to segments with larger street widths. Node street width is defined as the maximal street width of the adjacent segments.
Horizontal Snapping Distance	The maximal horizontal distance between a node and a target segment. This option is only relevant if the Snap Nodes to Segments option is checked.
Vertical Snapping Distance	The maximal vertical distance between a node and a target segment. This option is only relevant if the Snap Nodes to Segments option is checked.
Merge Nodes	When checked, nodes that are close to each other are merged.
Horizontal Merge Distance	Nodes that are closer than this distance in a horizontal direction are merged into one. This option is only relevant if the Merge Nodes option is checked.
Vertical Merge Distance	Nodes that are closer than this distance in a vertical direction are merged into one. This option is only relevant if the Merge Nodes option is checked.
Resolve Conflicting Shapes	When checked, the tool collapses all street segments that cause street shape conflicts. This is run iteratively until no conflicts exist. Note: Segments with the smallest minimal adjacent node valence are collapsed first; that is, this segment valence determines the order of the segment collapse iteration.

Note:

This tool operates planar in the x-z plane. The y-coordinate is ignored. Running this tool on graph networks containing segments on different y-levels is not recommended.

Examples

Simple intersections
Snap nodes to segments
Simple merge
Full cleanup
Resolve conflicting shapes