Find all features around a given point, and optionally match specific 'key'-'value' pairs. This function is not intended to be combined with add_osm_feature, rather is only to be used in the sequence opq_around -> osmdata_xml (or other extraction function). See examples for how to use.
Longitude of desired point
Latitude of desired point
Radius in metres around the point for which data should be extracted. Queries with large values for this parameter may fail.
(Optional) OSM key of enclosing data
(Optional) OSM value matching 'key' of enclosing data
It may be necessary to increase this value for large queries, because the server may time out before all data are delivered.