Why do we need barrier classes in ArcGIS?
The time it takes to create or load a line or polygon barrier is proportional to the number of network elements it covers. Using barriers to cover dense or large regions of your network may not be feasible. Barrier classes are present in all network analysis layers.
How are barriers used in a network analysis?
Barriers are feature classes in network analysis layers that restrict or alter costs of the underlying edges and junctions of the associated network dataset. Barriers are split into three geometry types (point, line, and polygon) and are designed to model temporary changes to the network.
How to create a route analysis layer in ArcGIS?
You can create a route analysis layer from the Network Analyst toolbar by clicking Network Analyst > New Route. When you create a new route analysis layer, it appears in the Network Analyst window along with its five network analysis classes—Stops, Routes, Point Barriers, Line Barriers, and Polygon Barriers.
How are line barriers different from point barriers?
Line Barriers feature layer Whereas point barriers snap to the nearest edge or junction, line barriers don’t snap to the network; therefore, line barriers need to overlap edges and junctions to have any effect on them.
How is a restriction polygon barrier used in a network?
A restriction polygon barrier prohibits travel anywhere the polygon intersects the network. One use of this type of barrier is to model floods covering areas of the network and making road travel there impossible. The left side depicts the shortest path between two points.
How does a scaled cost polygon barrier work?
A scaled cost polygon barrier doesn’t restrict travel on the edges and junctions it covers; rather, it scales the cost of traversing the covered edges and junctions by a factor you specify, such as 0.25, which would mean travel is expected to be four times faster than normal.