Batch geocoding in R

API conditions constantly change, but this should work right now.

OSM:

devtools::install_github("hrbrmstr/nominatim")
library(nominatim)
b1 <- osm_geocode("Berlin, Germany")
b1[c("lat", "lon")]

Yahoo:

devtools::install_github("trestletech/rydn")
library(rydn)
options(RYDN_KEY="yourAPIkey", RYDN_SECRET="yourSecret")
b2 <- find_place("Berlin, Germany")  
b2[c("latitude", "longitude")]

Bing: taRifx.geo (works with Google) and supposedly works with Bing, but I could never get it to work, so I wrote my own function.

bGeoCode <- function(str, BingMapsKey){
    require(RCurl)
    require(RJSONIO)
    u <- URLencode(paste0("http://dev.virtualearth.net/REST/v1/Locations?q=", str, "&maxResults=1&key=", BingMapsKey))
    d <- getURL(u)
    j <- fromJSON(d,simplify = FALSE) 
    if (j$resourceSets[[1]]$estimatedTotal > 0) {
      lat <- j$resourceSets[[1]]$resources[[1]]$point$coordinates[[1]]
      lng <- j$resourceSets[[1]]$resources[[1]]$point$coordinates[[2]]
    }
    else {    
      lat <- lng <- NA
    }
    c(lat,lng)
}  

bGeoCode("Berlin, Germany", "yourAPIkey")

Google:

library(ggmap)  
register_google(key = "yourAPIkey")
geocode("Berlin, Germany", source="google")