The network layer in MapWeave comes with a number of graph analysis functions which you can use to add insight to your data.
Using these functions, you can score your data and then use these scores for example to add meaningful node styling that identifies the most influential nodes or highlights the connections of a selected node.
The graph analysis functions are powered by a graph engine which runs separately from the graph rendering methods. The available functions are:
- Betweenness - Measures the number of times a node lies on the shortest path between other nodes. Shows important nodes that would have the greatest impact on the network connectivity if removed.
- Components - Calculates the separate 'connected components' of the graph.
- Degrees - Measures the number of direct, 'one hop' connections each node has to other nodes within the network. Shows very connected nodes which can quickly connect with the wider network.
- Neighbors - Finds the nodes that are linked to the node or nodes passed in.
Running Graph Analysis
Call the createGraphEngine() function to create a graph engine instance, and pass the data in the NetworkLayerData format to the function to analyze the data:
const graphEngine = networkLayer.createGraphEngine(networkData);And then use the graph engine to run the graph function, for example:
const results = graphEngine.betweenness();The graph function returns a result which you can use, for example, to style nodes.
Alternatively, you can call the getGraphEngine() function directly on a network layer.
Use this approach to work with the data loaded into the network layer:
- When the
timeFilterRangeoption is set, the analysis only runs on the filtered graph. - When
proximityCombineis set to true, the analysis only runs on the combined nodes and ignores their underlying children.
const graphEngine = networkLayer.getGraphEngine();
const results = graphEngine.betweenness();First you need to import the createNetworkGraphEngine() function to enable the graph engine in the network layer:
import { NetworkLayer, createNetworkGraphEngine } from 'mapweave/react/layers';Once it's imported, call createNetworkGraphEngine() to create a graph engine instance, and pass the data in the NetworkLayerData format to the function to analyze the data:
const graphEngine = createNetworkGraphEngine(networkData);And then use the graph engine to run any of the graph functions available, for example:
const results = graphEngine.betweenness();The graph function returns a result which you can use, for example, to style the nodes.