Extract all osm_multilines from an osmdata object

Source: R/osm-extract.R

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.

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

Examples

if (FALSE) {
dat <- opq ("London UK")
    add_osm_feature (key="name", value="Thames", exact=FALSE)
# 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"
}