Removes redundant (straight-line) vertices from graph, leaving only junction vertices.
A flat table of graph edges. Must contain columns labelled
Optional list of vertices to be retained as routing points.
These must match the
A contracted version of the original
graph, containing the same
number of columns, but with each row representing an edge between two
junction vertices (or between the submitted
verts, which may or may not be
1 2 3 4
graph <- weight_streetnet (hampi) nrow (graph) # 5,973 graph <- dodgr_contract_graph (graph) nrow (graph) # 662
 5973  662
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