osrm (version 3.5.1)

osrmIsometric: Get Polygons of Isodistances

Description

Based on osrmTable, this function buids polygons of isometric road distances.

Usage

osrmIsometric(
  loc,
  breaks = seq(from = 0, to = 10000, length.out = 4),
  exclude = NULL,
  res = 30,
  returnclass = "sf",
  osrm.server = getOption("osrm.server"),
  osrm.profile = getOption("osrm.profile")
)

Value

An sf MULTIPOLYGON of isochrones is returned. The data frame of the output contains four fields: id (id of each polygon), min and max (minimum and maximum breaks of the polygon), center (central values of classes).

Arguments

loc

a numeric vector of longitude and latitude (WGS84), an sf object of the origine point.

breaks

a numeric vector of isometric values (in meters).

exclude

pass an optional "exclude" request option to the OSRM API.

res

number of points used to compute isochrones, one side of the square grid, the total number of points will be res*res.

returnclass

class of the returned polygons.

osrm.server

the base URL of the routing server. getOption("osrm.server") by default.

osrm.profile

the routing profile to use, e.g. "car", "bike" or "foot" (when using the routing.openstreetmap.de test server). getOption("osrm.profile") by default.

See Also

osrmTable

Examples

if (FALSE) {
library(sf)
# Get isochones with lon/lat coordinates
iso <- osrmIsometric(loc = c(13.43,52.47), breaks = c(0,100,200, 500, 1000),
                     returnclass="sf")
plot(st_geometry(iso))
}