points_to_od {od}

Convert a series of points into a dataframe of origins and destinations

Description

Takes a series of geographical points and converts them into a data.frame representing the potential flows, or 'spatial interaction', between every combination of points.

Usage

points_to_od(p, pd = NULL, interzone_only = FALSE, ids_only = FALSE)

points_to_odl(
  p,
  pd = NULL,
  interzone_only = FALSE,
  ids_only = FALSE,
  crs = 4326
)

Arguments

p

A spatial points object or a matrix of coordinates representing points

pd

Optional spatial points object or matrix objects representing destinations

interzone_only

Should the result only include interzonal OD pairs, in which the ID of the origin is different from the ID of the destination zone? FALSE by default

ids_only

Should a data frame with only 2 columns (origin and destination IDs) be returned? The default is FALSE, meaning the result should also contain the coordinates of the start and end points of each OD pair.

crs

The coordinate reference system of the output, if not known in z. 4326 by default.

Details

points_to_odl() generates the same output but returns a geographic object representing desire lines in the class sf.

Examples

library(sf)
p = od_data_centroids[1:3, ]
points_to_od(p)
points_to_od(p, ids_only = TRUE)
(l = points_to_odl(p, interzone_only = TRUE))
plot(l)
library(sf) # for subsetting sf objects:
points_to_od(od_data_centroids[1:2, ], od_data_centroids[3, ])
l = points_to_odl(od_data_centroids[1:2, ], od_data_centroids[3, ])
plot(l)
(od = points_to_od(p, interzone_only = TRUE))
l2 = od_to_sf(od, od_data_centroids)
l2$v = 1
(l2_oneway = od_oneway(l2))
plot(l2)