osm_multilines: Extract all 'osm_multilines' from an osmdata object

In osmdatar/osmdata: Import 'OpenStreetMap' Data as Simple Features or Spatial Objects

Extract all osm_multilines from an osmdata object

Description

id must be of an osm_points or osm_lines object (and can not be the id of an osm_polygons object because multilines by definition contain no polygons. osm_multilines returns any multiline object(s) which contain the object specified by id.

Usage

osm_multilines(dat, id)

Arguments

dat	An object of class osmdata
id	OSM identification of one of more objects for which multilines are to be extracted

Value

An sf Simple Features Collection of multilines

See Also

Other search: osm_lines(), osm_multipolygons(), osm_points(), osm_polygons()

Examples

## Not run: 
dat <- opq ("London UK") %>%
    add_osm_feature (key = "name", value = "Thames", exact = FALSE) %>%
    osmdata_sf ()
# Get ids of lines called "The Thames":
id <- rownames (dat$osm_lines [which (dat$osm_lines$name == "The Thames"), ])
# and find all multilinestring objects which include those lines:
osm_multilines (dat, id)
# Now note that
nrow (dat$osm_multilines) # = 24 multiline objects
nrow (osm_multilines (dat, id)) # = 1 - the recursive search selects the
# single multiline containing "The Thames"

## End(Not run)

osmdatar/osmdata documentation built on April 14, 2024, 5:28 p.m.