Route Node Reduction rule sample results

The following samples show Route Node Reduction rule execution results on two diagrams.

With the Network Dataset builder, the diagrams can be generated with or without merging nodes—that is, each network element junction that occurs several times along the resultant route can be represented either by a single merged schematic node or several times in the generated diagram. When a diagram is generated without merging nodes, since all the schematic nodes are nodes with two connections, they are all route nodes. When nodes are merged, the degree of the merged nodes is more than 2 and the Route Node Reduction rule, which only operates on route nodes (degree 2 nodes), doesn't reduce the merged nodes. For a better understanding, the Route Node Reduction rule result samples are shown on two diagrams based on the same solved route network analysis: diagram A, generated without merged nodes, and diagram B, generated with merged nodes.

Figure A shows sample diagram A generated without merging nodes. In this case, each junction and edge that occur several times along the resultant network route is represented by several schematic nodes and links in the generated diagram. The multiplied schematic nodes and links overlap in the diagram.

Sample diagram A, generated without merged nodes

Figure B shows sample diagram B obtained when schematic nodes are merged. In this case, the junctions that occur several times along the resultant network route are not multiplied in the generated diagrams. Only the edges that connect these junctions are multiplied. Using the Separate Overlapping Links schematic layout algorithm on this diagram clearly highlights these merged schematic nodes and their connected links.

Sample diagram B, generated with merged nodes

Sample 1—Reducing all route nodes implemented by a given schematic feature class

For the schematic diagram template implementing these sample diagrams, the Route Node Reduction rule is defined to reduce the red route nodes related to ParisMultimodal_ND_Junctions:

Route Node Reduction rule properties specified to reduce the red ParisMultimodal_ND_Junctions

The following figures show the result obtained after updating diagrams A and B while this reduction rule is active:

Diagram A after reducing nodes with 2 connections
Diagram B after reducing nodes with 2 connections

Figure A.1.1 shows diagram A generated without merged nodes after rule execution. Since all the ParisMultimodal_ND_Junctions nodes contained in the diagram were schematic nodes with two connections, the rule reduced all of them. For the diagram generated with merged nodes, figure B.1.1, only the nodes with two connections have been reduced during rule execution. The merged nodes have been kept.

The following figures show diagram B, the one with merged nodes, after it has been laid out using the Hierarchical—Smart Tree schematic layout algorithm: figure B.1.2 shows diagram B content while the Route Node Reduction rule is not active, and figure B.1.3 shows the same diagram while the rule is active.

Diagram B laid out using the Smart Tree schematic layout algorithm before the Route Node Reduction rule execution
Diagram B laid out using the Smart Tree schematic layout algorithm after the Route Node Reduction rule execution

Figure B.1.4 shows the Attr_DriveTime attribute values for the two schematic links currently selected in diagram B while the Route Node Reduction rule is inactive.

Attr_DriveTime attribute values on the two currently selected schematic links in Diagram B before the Route Node Reduction rule execution

Figure B.1.5 shows information from the single schematic link that is kept after the Route Node Reduction rule is executed.

Checking the Attr_DriveTime attribute value and using the Identify tool on the schematic link that is kept after the Route Node Reduction rule execution on Diagram B

Sample 2—Reducing route nodes implemented by a given schematic feature class according to their incident angle

The following screen shots show the results obtained on diagrams A and B while the Route Node Reduction rule is executed to reduce the ParisMultimodal_ND_Junctions route nodes only when their incident links form an angle smaller than 30 degrees.

The Route Node Reduction rule attributes are specified as follows:

Route Node Reduction rule properties specified to reduce the red ParisMultimodal_ND_Junctions when their incident links formed an angle lower than 30 degrees

Figures A.2.1 and B.2.1 show the results obtained after the diagrams are updated while this Route Node Reduction rule is active.

Diagram A after the Route Node Reduction rule execution
Diagram B after the Route Node Reduction rule execution

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7/11/2012