R: Extract all 'osm_multilines' from an osmdata object

osm_multilines {osmdata}

R Documentation

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

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)