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#' HERE Geocoder API: Geocode
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#'
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#' Geocodes addresses using the HERE 'Geocoder' API.
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#'
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#' @references
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#' \href{https://developer.here.com/documentation/geocoding-search-api/dev_guide/topics/endpoint-geocode-brief.html}{HERE Geocoder API: Geocode}
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#'
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#' @param address character, addresses to geocode.
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#' @param sf boolean, return an \code{sf} object (\code{default = TRUE}) or a
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#' \code{data.frame}?
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#' @param url_only boolean, only return the generated URLs (\code{default =
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#' FALSE})?
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#' @param addresses character, addresses to geocode (deprecated).
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#'
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#' @return
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#' If \code{sf = TRUE}, an \code{sf} object, containing the position coordinates
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#' geocoded addresses as geometry list column and the access coordinates as
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#' well-known text (WKT).
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#' If \code{sf = FALSE}, a \code{data.frame} containing the coordinates of the
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#' geocoded addresses as \code{lng}, \code{lat} columns.
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#' @export
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#'
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#' @examples
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#' # Provide an API Key for a HERE project
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#' set_key("<YOUR API KEY>")
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#'
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#' locs <- geocode(address = poi$city, url_only = TRUE)
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geocode <- function(address, sf = TRUE, url_only = FALSE, addresses) {
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if (!missing("addresses")) {
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warning("'addresses' is deprecated, use 'address' instead.")
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address <- addresses
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}
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# Input checks
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.check_addresses(address)
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.check_boolean(sf)
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.check_boolean(url_only)
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# Add API key
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url <- .add_key(
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url = "https://geocode.search.hereapi.com/v1/geocode?"
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)
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# Add addresses
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url = paste0(
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url,
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"&q=",
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address
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)
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# Return urls if chosen
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if (url_only) return(url)
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# Request and get content
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data <- .get_content(
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url = url
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)
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if (length(data) == 0) return(NULL)
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# Extract information
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geocoded <- .extract_geocoded(data, address)
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# Create sf object
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if (nrow(geocoded) > 0) {
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rownames(geocoded) <- NULL
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# Return sf object if chosen
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if (sf) {
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# Parse access coordinates to WKT
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geocoded$access <- .wkt_from_point_df(geocoded, "lng_access", "lat_access")
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geocoded[, c("lng_access", "lat_access") := NULL]
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# Parse position coordinates and set as default geometry
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return(
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sf::st_set_crs(
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sf::st_as_sf(
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as.data.frame(geocoded),
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coords = c("lng_position", "lat_position"),
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sf_column_name = "geometry"
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), value = 4326
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)
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)
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} else {
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return(as.data.frame(geocoded))
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}
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} else {
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return(NULL)
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}
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}
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.extract_geocoded <- function(data, address) {
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template <- data.table::data.table(
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id = numeric(),
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address = character(),
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type = character(),
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street = character(),
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house_number = character(),
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postal_code = character(),
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district = character(),
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city = character(),
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county = character(),
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state = character(),
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country = character(),
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lng_access = numeric(),
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lat_access = numeric(),
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lng_position = numeric(),
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lat_position = numeric()
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)
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ids <- .get_ids(data)
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count <- 0
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geocode_failed <- character(0)
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geocoded <- data.table::rbindlist(
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append(list(template),
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lapply(data, function(con) {
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count <<- count + 1
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df <- jsonlite::fromJSON(con)
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if (length(df$items) == 0) {
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geocode_failed <<- c(geocode_failed, address[count])
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return(NULL)
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}
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result <- data.table::data.table(
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id = ids[count],
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address = df$items$address$label,
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type = df$items$resultType,
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street = df$items$address$street,
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house_number = df$items$address$houseNumber,
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postal_code = df$items$address$postalCode,
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district = df$items$address$district,
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city = df$items$address$city,
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county = df$items$address$county,
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state = df$items$address$state,
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country = df$items$address$countryName,
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lng_access = if (is.null(df$items$access[[1]]$lng)) NA else df$items$access[[1]]$lng,
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lat_access = if (is.null(df$items$access[[1]]$lat)) NA else df$items$access[[1]]$lat,
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lng_position = df$items$position$lng,
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lat_position = df$items$position$lat
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)
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result[1, ]
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})
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), fill = TRUE
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)
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if (length(geocode_failed) > 0) {
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message(
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sprintf(
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"Address(es) '%s' not found.",
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paste(geocode_failed, collapse = "', '")
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)
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)
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}
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return(geocoded)
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}
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