R: Extract all 'osm_multipolygons' from an osmdata object

osm_multipolygons {osmdata} | R Documentation

## Extract all `osm_multipolygons` from an osmdata object

### Description

`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

    ## Not run:
    # 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

    ## End(Not run)

[Package osmdata version 0.1.10 Index]