This is a structure for nodes extracted from the spatial network, and each node cooresponds to one row in the object; for each row, the structure is defined as [NodeID,coordinate(X,Y)].
This list is the immediate result of extracting nodes from a “SpatialLines” or “SpatialLinesDataFrame” object, see readshpnw. As a transition object, it is a necessary input for many functions in this package, like Degree.list, ME.simplification, Nodes.coordinates.