Stations and stops

Retrieve data on public transport stations and stops in Germany. Stations and stops are hierarchical. This means that stations represent the structural facilities as hierarchically superior objects and stops are hierarchically inferiors parts of a station (e.g., a single platform at a bus stop).

Usage

bkg_stations(
  ...,
  bbox = NULL,
  poly = NULL,
  predicate = "intersects",
  filter = NULL,
  epsg = 3035,
  properties = NULL,
  max = NULL
)

Arguments

...

Used to construct CQL filters. Dot arguments accept an R-like syntax that is converted to CQL queries internally. These queries basically consist of a property name on the left, an aribtrary vector on the right, and an operator that links both sides. If multiple queries are provided, they will be chained with AND. The following operators and their respective equivalents in CQL and XML are supported:

R	CQL	XML
==	=	PropertyIsEqualTo
!=	<>	PropertyIsNotEqualTo
<	<	PropertyIsLessThan
>	>	PropertyIsGreaterThan
>=	>=	PropertyIsGreaterThanOrEqualTo
<=	<=	PropertyIsLessThanOrEqualTo
%LIKE%	LIKE	PropertyIsLike
%ILIKE%	ILIKE
	%in%	IN

To construct more complex queries, you can use the filter argument to pass CQL queries directly. Also note that you can switch between CQL and XML queries using options(ffm_query_language = "xml"). See also wfs_filter.

bbox

An sf geometry or a boundary box vector of the format c(xmin, ymin, xmax, ymax). Used as a geometric filter to include only those geometries that relate to bbox according to the predicate specified in predicate. If an sf geometry is provided, coordinates are automatically transformed to ESPG:25832 (the default CRS), otherwise they are expected to be in EPSG:25832.

poly

An sf geometry. Used as a geometric filter to include only those geometries that relate to poly according to the predicate specified in predicate. Coordinates are automatically transformed to ESPG:25832 (the default CRS).

predicate

A spatial predicate that is used to relate the output geometries with the object specified in bbox or poly. For example, if predicate = "within", and bbox is specified, returns only those geometries that lie within bbox. Can be one of "equals", "disjoint", "intersects", "touches", "crosses", "within", "contains", "overlaps", "relate", "dwithin", or "beyond". Defaults to "intersects".

filter

A character string containing a valid CQL or XML filter. This string is appended to the query constructed through .... Use this argument to construct more complex filters. Defaults to NULL.

epsg

An EPSG code specifying a coordinate reference system of the output. If you're unsure what this means, try running sf::st_crs(...)$epsg on a spatial object that you are working with. Defaults to 3035.

properties

Vector of columns to include in the output.

max

Maximum number of results to return.

Value

A dataframe with the following columns:

• name: Geographical name of the POI

• gemeinde: Municipality name

• verwaltung: Administrative association name

• kreis: District name

• regierungs: Government region name

• bundesland: Federal state name

• stop_id: Identifier of the station or stop

• parent_st: Identifier of the parent station if applicable

• verkehrsm: Vehicle used at the station, comma-separated and sorted alphabetically

• art: Hierarchical position of a station. Can be:

  • Station: A physical structure and hierarchically superior

  • Haltestelle: Part of a structure and hierarchically inferior

• tag_f_awo: Mean departures per day in a work week

• tag_f_wo: Mean departures per day in a full week

Query language

By default, WFS requests use CQL (Contextual Query Language) queries for simplicity. CQL queries only work together with GET requests. This means that when the URL is longer than 2048 characters, they fail. While POST requests are much more flexible and able to accommodate long queries, XML is really a pain to work with and I'm not confident in my approach to construct XML queries. You can control whether to send GET or POST requests by setting options(ffm_query_language = "XML") or options(ffm_query_language = "CQL").

See also

wfs_poi_open documentation

wfs_poi_open MIS record

Other points of interest: bkg_airports(), bkg_crossings(), bkg_heliports(), bkg_kilometrage(), bkg_seaports(), bkg_trauma_centers()

Examples

if (FALSE) { # getFromNamespace("ffm_run_examples", ns = "ffm")()
# Get all long-distance train stations
bkg_stations(verkehrsm %LIKE% "%Fernzug%", art == "Station")

# Get all platforms of long-distance train stations
bkg_stations(verkehrsm %LIKE% "%Fernzug%", art == "Haltestelle")

# Get all stops with high traffic
bkg_stations(tag_f_awo > 1000, art == "Station")

# Get all bus stops with low traffic
bkg_stations(tag_f_awo < 1, verkehrsm %LIKE% "%Bus%", art == "Station")
}