| edgelist {shp2graph} | R Documentation |
A designed structure to denote edges from a spatial network
Description
“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