mapdist: Compute map distances using Google

In KimByoungmo/modefiedggmap: Spatial Visualization with ggplot2

Description

Compute map distances using Google Maps. Note that in most cases by using this function you are agreeing to the Google Maps API Terms of Service at https://developers.google.com/maps/terms.

Usage

mapdist(from, to, mode = c("driving", "walking", "bicycling"),
  output = c("simple", "all"), messaging = FALSE, sensor = FALSE,
  language = "en-EN", override_limit = FALSE)

Arguments

from	name of origin addresses in a data frame (vector accepted)
to	name of destination addresses in a data frame (vector accepted)
mode	driving, bicycling, or walking
output	amount of output
messaging	turn messaging on/off
sensor	whether or not the geocoding request comes from a device with a location sensor
language	language
override_limit	override the current query count (.GoogleDistQueryCount)

Details

if parameters from and to are specified as geographic coordinates, they are reverse geocoded with revgeocode. note that the google maps api limits to 2500 element queries a day.

Value

a data frame (output="simple") or all of the geocoded information (output="all")

Author(s)

David Kahle [e-mail]

See Also

http://code.google.com/apis/maps/documentation/distancematrix/

Examples

## Not run:  online queries draw R CMD check times

mapdist("waco, texas", "houston, texas")

from <- c("houston, texas", "dallas")
to <- "waco, texas"
mapdist(from, to)
mapdist(from, to, mode = "bicycling")
mapdist(from, to, mode = "walking")

from <- c("houston", "houston", "dallas")
to <- c("waco, texas", "san antonio", "houston")
mapdist(from, to)


# geographic coordinates are accepted as well
(wh <- as.numeric(geocode("the white house, dc")))
(lm <- as.numeric(geocode("lincoln memorial washington dc")))
mapdist(wh, lm, mode = "walking")
distQueryCheck()


## End(Not run)

KimByoungmo/modefiedggmap documentation built on May 8, 2019, 4:49 p.m.