Generate an igraph object from a feature collection of linestrings
build_graph(lines, digits, line_weight, attrs = FALSE)A feature collection of lines
The number of digits to keep from the coordinates
The name of the column giving the weight of the lines
A boolean indicating if the original lines' attributes should be stored in the final object
A list containing the following elements:
graph: an igraph object;
linelist: the dataframe used to build the graph;
lines: the original feature collection of linestrings;
spvertices: a feature collection of points representing the vertices of the graph;
digits : the number of digits kept for the coordinates.
This function can be used to generate an undirected graph object (igraph object). It uses the coordinates of the linestrings extremities to create the nodes of the graph. This is why the number of digits in the coordinates is important. Too high precision (high number of digits) might break some connections.
data(mtl_network)
mtl_network$length <- as.numeric(sf::st_length(mtl_network))
graph_result <- build_graph(mtl_network, 2, "length", attrs = TRUE)