Geocode amenities in sf format — geo_amenity

This function search amenities as defined by OpenStreetMap on a restricted area defined by a bounding box in the form (<xmin>, <ymin>, <xmax>, <ymax>). This function returns the spatial object associated with the query using sf, see geo_amenity() for retrieving the data in tibble format.

Usage

geo_amenity_sf(
  bbox,
  amenity,
  limit = 1,
  full_results = FALSE,
  return_addresses = TRUE,
  verbose = FALSE,
  nominatim_server = "https://nominatim.openstreetmap.org/",
  progressbar = TRUE,
  custom_query = list(),
  strict = FALSE,
  points_only = TRUE
)

Arguments

bbox

The bounding box (viewbox) used to limit the search. It could be:

A numeric vector of longitude (x) and latitude (y) (xmin, ymin, xmax, ymax). See Details.
A sf or sfc object.

amenity

A character (or a vector of characters) with the amenities to be geolocated (i.e. c("pub", "restaurant")). See osm_amenities.

limit

Maximum number of results to return per input address. Note that each query returns a maximum of 50 results.

full_results

Returns all available data from the API service. If FALSE (default) only latitude, longitude and address columns are returned. See also return_addresses.

return_addresses

Return input addresses with results if TRUE.

verbose

If TRUE then detailed logs are output to the console.

nominatim_server

The URL of the Nominatim server to use. Defaults to "https://nominatim.openstreetmap.org/".

progressbar

Logical. If TRUE displays a progress bar to indicate the progress of the function.

custom_query

A named list with API-specific parameters to be used (i.e. list(countrycodes = "US")). See Details.

strict

Logical TRUE/FALSE. Force the results to be included inside the bbox. Note that Nominatim default behavior may return results located outside the provided bounding box.

points_only

Logical TRUE/FALSE. Whether to return only spatial points (TRUE, which is the default) or potentially other shapes as provided by the Nominatim API (FALSE). See About Geometry Types.

Value

A sf object with the results.

Details

Bounding boxes can be located using different online tools, as Bounding Box Tool.

For a full list of valid amenities see https://wiki.openstreetmap.org/wiki/Key:amenity and osm_amenities.

See https://nominatim.org/release-docs/latest/api/Search/ for additional parameters to be passed to custom_query.

About Geometry Types

The parameter points_only specifies whether the function results will be points (all Nominatim results are guaranteed to have at least point geometry) or possibly other spatial objects.

Note that the type of geometry returned in case of points_only = FALSE will depend on the object being geocoded:

Administrative areas, major buildings and the like will be returned as polygons.
Rivers, roads and their like as lines.
Amenities may be points even in case of a points_only = FALSE call.

The function is vectorized, allowing for multiple addresses to be geocoded; in case of points_only = FALSE multiple geometry types may be returned.

Examples

# \donttest{
# Usera, Madrid

library(ggplot2)
mad <- geo_lite_sf("Usera, Madrid, Spain", points_only = FALSE)


# Restaurants, pubs and schools

rest_pub <- geo_amenity_sf(mad, c("restaurant", "pub", "school"),
  limit = 50
)
#> 
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if (any(!sf::st_is_empty(rest_pub))) {
  ggplot(mad) +
    geom_sf() +
    geom_sf(data = rest_pub, aes(color = query, shape = query))
}

# }