igraph object with geospatial attributes for the
geonetwork(edges, nodes, directed = TRUE, CRS = sp::CRS("+proj=longlat"))
data.frame. Edges list and attributes. See Details.
data.frame. Nodes list and attributes. See Details.
logical. Default is to build a directed graph.
CRS object. Coordinate Reference System, as built by
An object of class
geonetwork, which also inherits
The first two columns in
edges must be character or factor,
and match the node names in the first column of the
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
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)#> IGRAPH 473a4a5 DN-- 3 2 -- #> + attr: name (v/c) #> + edges from 473a4a5 (vertex names): #>  A->B A->C