geonetwork function

Create geographic networks

Create an igraph object with geospatial attributes for the nodes.

geonetwork(edges, nodes, directed = TRUE, CRS = 4326)

Arguments

• edges: data.frame. Edges list and attributes. See Details.
• nodes: data.frame. Nodes list and attributes. See Details.
• directed: logical. Default is to build a directed graph.
• CRS: Coordinate Reference System, as a numeric or character code, an object of class [sf::sf] or [sf::sfc], or a src object as built by function [sf::st_crs].

Returns

An object of class geonetwork, which also inherits from igraph.

Details

The first two columns in edges must be character or factor, and match the node names in the first column of the nodes

data.frame. The third column, if any, will be used as edge weights. The remaining columns will be used as additional edge attributes.

The first column in nodes must be character or factor and provide node names or labels, not necessarily unique. Columns 2 and 3 must be numeric coordinates in the Coordinate Reference System specified in CRS.

Examples

e <- data.frame(from = c("A", "A"), to = c("B", "C"))
  n <- data.frame(id = LETTERS[1:3], x = c(0, 0, 1), y = c(0, 1, 0))
  geonetwork(e, n)