Alias for match_points_to_graph

match_points_to_graph(verts, xy, connected = FALSE)

Arguments

verts

A data.frame of vertices obtained from dodgr_vertices(graph).

xy

coordinates of points to be matched to the vertices, either as matrix or sf-formatted data.frame.

connected

Should points be matched to the same (largest) connected component of graph? If FALSE and these points are to be used for a dodgr routine routine (dodgr_dists, dodgr_paths, or dodgr_flows_aggregate), then results may not be returned if points are not part of the same connected component. On the other hand, forcing them to be part of the same connected component may decrease the spatial accuracy of matching.

Value

A vector index into verts

Examples

net <- weight_streetnet (hampi, wt_profile = "foot") verts <- dodgr_vertices (net) # Then generate some random points to match to graph npts <- 10 xy <- data.frame ( x = min (verts$x) + runif (npts) * diff (range (verts$x)), y = min (verts$y) + runif (npts) * diff (range (verts$y)) ) pts <- match_pts_to_graph (verts, xy) pts # an index into verts
#> [1] 1799 739 760 443 762 748 435 1688 505 588
pts <- verts$id [pts] pts # names of those vertices
#> [1] "2588146136" "1204772804" "1204772780" "2398957895" "1388482473" #> [6] "1388481881" "1128374394" "2195425131" "1691495677" "3544918756"