Package index • dodgr

Main functions

dodgr_distances(): Calculate matrix of pair-wise distances between points.

dodgr_dists(): Calculate matrix of pair-wise distances between points.

dodgr_dists_categorical(): Cumulative distances along different edge categories

dodgr_dists_nearest(): Calculate vector of shortest distances from a series of 'from' points to nearest one of series of 'to' points.

dodgr_flows_aggregate(): Aggregate flows throughout a network.

dodgr_flows_disperse(): Aggregate flows dispersed from each point in a network.

dodgr_flows_si(): Aggregate flows throughout a network using a spatial interaction model.

dodgr_isochrones(): Calculate isochrone contours from specified points.

dodgr_isodists(): Calculate isodistance contours from specified points.

dodgr_isoverts(): Calculate isodistance or isochrone contours from specified points.

dodgr_paths(): Calculate lists of pair-wise shortest paths between points.

dodgr_times(): Calculate matrix of pair-wise travel times between points.

Functions to Obtain Graphs

dodgr_streetnet(): Extract a street network in sf-format for a given location.

dodgr_streetnet_sc(): Extract a street network in silicate-format for a given location.

weight_railway(): Weight a network for routing along railways.

weight_streetnet(): Weight a street network according to a specified weighting profile.

Functions to Modify Graphs

dodgr_components(): Identify connected components of graph.

dodgr_contract_graph(): Contract graph to junction vertices only.

dodgr_uncontract_graph(): Re-expand a contracted graph.

Functions to Convert Graphs

dodgr_deduplicate_graph(): Deduplicate edges in a graph

dodgr_to_igraph(): Convert a dodgr graph to an igraph.

dodgr_to_sf(): Convert a dodgr graph into an equivalent sf object.

dodgr_to_sfc(): Convert a dodgr graph into an equivalent sf::sfc object.

dodgr_to_tidygraph(): Convert a dodgr graph to an tidygraph.

igraph_to_dodgr(): Convert a igraph network to an equivalent dodgr representation.

Graph Centrality

dodgr_centrality(): Calculate betweenness centrality for a 'dodgr' network.

estimate_centrality_threshold(): Estimate a value for the 'dist_threshold' parameter of the dodgr_centrality function.

estimate_centrality_time(): Estimate time required for a planned centrality calculation.

Matching Points to Graphs

add_nodes_to_graph(): Insert new nodes into a graph, breaking edges at point of nearest intersection.

match_points_to_graph(): Alias for match_pts_to_graph

match_points_to_verts(): Alias for match_pts_to_verts

match_pts_to_graph(): Match spatial points to the edges of a spatial graph.

match_pts_to_verts(): Match spatial points to the vertices of a spatial graph.

Miscellaneous Functions

compare_heaps(): Compare timings of different sort heaps for a given input graph.

dodgr_flowmap(): Create a map of dodgr flows.

dodgr_full_cycles(): Calculate fundamental cycles on a FULL (that is, non-contracted) graph.

dodgr_fundamental_cycles(): Calculate fundamental cycles in a graph.

dodgr_insert_vertex(): Insert a new node or vertex into a network

dodgr_sample(): Sample a random but connected sub-component of a graph

dodgr_sflines_to_poly(): Convert sf LINESTRING objects to POLYGON objects representing all fundamental cycles within the LINESTRING objects.

dodgr_vertices(): Extract vertices of graph, including spatial coordinates if included.

merge_directed_graph(): Merge directed edges into equivalent undirected edges.

summary(<dodgr_dists_categorical>): Transform a result from dodgr_dists_categorical to summary statistics

write_dodgr_wt_profile(): Write dodgr weighting profiles to local file.

Save, Load, and Caching

clear_dodgr_cache(): Remove cached versions of dodgr graphs.

dodgr_cache_off(): Turn off all dodgr caching in current session.

dodgr_cache_on(): Turn on all dodgr caching in current session.

dodgr_load_streetnet(): Load a street network previously saved with dodgr_save_streetnet.

dodgr_save_streetnet(): Save a weighted streetnet to a local file

Package Data

hampi: Sample street network from Hampi, India.

os_roads_bristol: Sample street network from Bristol, U.K.

weighting_profiles: Weighting profiles used to route different modes of transport.

The ‘dodgr’ package

dodgr-package dodgr: Distances On Directed GRaphs ("dodgr")