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2 - Topological node

Algorithm ID: hedgetools:topologicalnode

This tool takes line geometries created from Topological arc and generates nodes at their junctions and extremities.

Nodes are characterized by their degree and associated node type:

Degree	Node type	Description
1	O	Node at the extremitry of a line
3	T	Node at a junction between three lines
4	X	Node at a junction between four lines
5+	M	Node at a junction between 5 or more lines

Parameters

Label	Name	Type	Description
Input arc layer	INPUT	[vector: line]	Line vector layer with a pid and eid fields to create the nodes from.
Output arc layer	OUTPUT_ARC	[vector: line] Default: [Create temporary layer]	Output line vector layer
Output node layer	OUTPUT_NODE	[vector: point] Default: [Create temporary layer]	Output point vector layer

Outputs

Label	Name	Type	Description
Output arc layer	OUTPUT_ARC	[vector: line]	Line vector layer of the main median axis with a src_vid (FK) and a tgt_vid (FK) field.
Output node layer	OUTPUT_NODE	[vector: point]	Point vector layer with a vid (PK), degree and node_type field.