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Extract all osm_multipolygons from an osmdata object

Source: R/osm-extract.R
osm_multipolygons.Rd

id must be of an osm_points, osm_lines, or osm_polygons object. osm_multipolygons returns any multipolygon object(s) which contain the object specified by id.

Usage

osm_multipolygons(dat, id)

Arguments

dat

An object of class osmdata

id

OSM identification of one or more objects for which multipolygons are to be extracted

Value

An sf Simple Features Collection of multipolygons

See also

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

Examples

if (FALSE) {
# find all multipolygons which contain the single polygon called
# "Chiswick Eyot" (which is an island).
dat <- opq ("London UK") %>%
    add_osm_feature (key = "name", value = "Thames", exact = FALSE) %>%
    osmdata_sf ()
index <- which (dat$osm_multipolygons$name == "Chiswick Eyot")
id <- rownames (dat$osm_polygons [id, ])
osm_multipolygons (dat, id)
# That multipolygon is the Thames itself, but note that
nrow (dat$osm_multipolygons) # = 14 multipolygon objects
nrow (osm_multipolygons (dat, id)) # = 1 - the main Thames multipolygon
}