mp_directions function

Get directions from the Google Maps Directions API

mp_directions(
  origin,
  waypoints = NULL,
  destination,
  mode = c("driving", "transit", "walking", "bicycling"),
  arrival_time = NULL,
  departure_time = NULL,
  alternatives = FALSE,
  avoid = c(NA, "tolls", "highways", "ferries", "indoor"),
  region = NULL,
  traffic_model = c("best_guess", "pessimistic", "optimistic"),
  transit_mode = c("bus", "subway", "train", "tram"),
  transit_routing_preference = c(NA, "less_walking", "fewer_transfers"),
  language = NULL,
  key,
  quiet = FALSE
)

Arguments

• origin: Origin, as

  • character vector of length one with address to be geocoded
  • numeric vector of length two (lon, lat)
  • matrix with one row and two columns (lon, lat)
  • sf or sfc point layer with one feature

• waypoints: Waypoints, in one of the same formats as for origins but possibly with more than one location, i.e.

  • character vector with addresses to be geocoded
  • numeric vector of length two (lon, lat)
  • matrix with two columns (lon, lat)
  • sf or sfc point layer

• destination: Destination, in one of the same formats as for origins

• mode: Travel mode, one of: "driving" (default), "transit", "walking", "bicycling"

• arrival_time: The desired time of arrival for transit directions, as POSIXct

• departure_time: The desired time of departure, as POSIXct

• alternatives: Whether to return more than one alternative (logical, default is FALSE)

• avoid: NA (default, means avoid nothing) or one of: "tolls", "highways", "ferries" or "indoor"

• region: The region code, specified as a ccTLD ("top-level domain") two-character value (e.g. "es" for Spain) (optional)

• traffic_model: The traffic model, one of: "best_guess" (the default), "pessimistic", "optimistic". The traffic_model parameter is only taken into account when departure_time is specified!

• transit_mode: Transit preferred mode, one or more of: "bus", "subway", "train" or "tram"

• transit_routing_preference: Transit route preference. NA (default, means no preference) or one of: "less_walking" or "fewer_transfers"

• language: The language in which to return directions. See https://developers.google.com/maps/faq#languagesupport for list of language codes.

• key: Google APIs key

• quiet: Logical; suppress printing URL for Google Maps API call (e.g. to hide API key)

Returns

XML document with Google Maps Directions API response

Note

• Use function mp_get_routes to extract sf line layer where each feature is a route
• Use function mp_get_segments to extract sf line layer where each feature is a route segment

Examples

# Built-in reponse example
library(xml2)
doc = as_xml_document(response_directions_driving)
r = mp_get_routes(doc)
seg = mp_get_segments(doc)

## Not run:

# Text file with API key
key = readLines("~/key")

# Using 'numeric' input
doc = mp_directions(
  origin = c(34.81127, 31.89277),
  destination = c(34.781107, 32.085003),
  alternatives = TRUE,
  key = key
)

# Using 'character' and 'sf' input
library(sf)
doc = mp_directions(
  origin = "Beer-Sheva",
  destination = c(34.781107, 32.085003) |> st_point() |> st_sfc(crs = 4326),
  alternatives = TRUE,
  key = key
)

# Comparing traffic models
doc = mp_directions(
  origin = "Beer-Sheva",
  destination = "Tel Aviv",
  departure_time = Sys.time() + as.difftime(1, units = "hours"),
  traffic_model = "best_guess",
  key = key
)
mp_get_routes(doc)$duration_in_traffic_text
doc = mp_directions(
  origin = "Beer-Sheva",
  destination = "Tel Aviv",
  departure_time = Sys.time() + as.difftime(1, units = "hours"),
  traffic_model = "optimistic",
  key = key
)
mp_get_routes(doc)$duration_in_traffic_text
doc = mp_directions(
  origin = "Beer-Sheva",
  destination = "Tel Aviv",
  departure_time = Sys.time() + as.difftime(1, units = "hours"),
  traffic_model = "pessimistic",
  key = key
)
mp_get_routes(doc)$duration_in_traffic_text
## End(Not run)

References

https://developers.google.com/maps/documentation/directions/overview