A designed structure to denote nodes from a spatial network
nodelist is an interchange structure of nodes from a spatial network into an igraph object. It is a two-column data frame, of which each row is designed as [NodeID,coordinate(X,Y)].
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.
Binbin Lu binbinlu@whu.edu.cn
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