Analyze graph

Graph networks can be analyzed by computing global integration, local integration and inbetween centrality. For each street these three values are computed and stored as object attribute "integrationGlobal", "integrationLocal" and "inbetweenCentrality". The values can be visualized or used to approximate street widths.


The default analyze graph settings.

In order to open the dialog, select a set of graph segments or a graph layer and choose Graph → Analyze Graph... from the main menu.

Settings

Definitions

All shortest paths between all selected street segments are computed. The shortest path cost function is the sum of all angles between the segments along the path.

Global integration

For each street segment, the shortest paths to all other segments are summed up. Each sum is then divided by the square of the number of segments. Next, each value is inverted. Finally, the values are normalized so that each value is in the range zero to one.

Local integration

For each street segment, the shortest paths to all other segments which are closer than (Depth of local integration) 90 degree turns are summed up. Each sum is then divided by the square of the number of visited segments. Next, each value is inverted. Finally, the values are normalized so that each value is in the range zero to one.

Inbetween centrality

For each street segment, the number of shortest paths which pass this segment is computed. Then, the values are normalized so that each value is in the range zero to one.

Example


The global integration of a typical street network.

Copyright ©2008-2016 Esri R&D Center Zurich. All rights reserved.