edgelist function

A designed structure to denote edges from a spatial network

edgelist is an interchange structure of edges from a spatial network into an igraph object. It is a three-column matrix, of which each row is designed as [EdgeID,NodeID(from),NodeID(to)].

Details

Both nodelist and edgelist are interchange structures of nodes and edges extracted from a spatial network in a SpatialLines or SpatialLinesDataFrame object. They are always concerned together, and returned by the function readshpnw as initial results for the following steps.

Note

If the parameter Detailed specified in readshpnw is TRUE, all the endpoints of polyines will be extracted as nodes, then the converted graph will have the same spatial details with the transformed SpatialLines

or SpatialLinesDataFrame object. To retrieve the original attributes in the SpatialLinesDataFrame object, the original edge ID is also kept and the row structure will be [EdgeID,eid,NodeID(from),NodeID(to)], in which EdgeID refers to the new edge id while eid represents the original edge ID.

Author(s)

Binbin Lu binbinlu@whu.edu.cn