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Convert osmdata polygons into lines

Source: R/poly2line.R
osm_poly2line.Rd

Street networks downloaded with add_osm_object(key = "highway") will store any circular highways in osm_polygons. this function combines those with the osm_lines component to yield a single sf data.frame of all highways, whether polygonal or not.

Usage

osm_poly2line(osmdat)

Arguments

osmdat

An osmdata_sf object.

Value

Modified version of same object with all osm_polygons objects merged into osm_lines.

Note

The osm_polygons field is retained, with those features also repeated as LINESTRING objects in osm_lines.

See also

Other transform: osm_elevation(), trim_osmdata(), unique_osmdata(), unname_osmdata_sf()

Examples

if (FALSE) { # \dontrun{
query <- opq ("colchester uk") |>
    add_osm_feature (key = "highway")
# Then extract data from 'Overpass' API
dat <- osmdata_sf (query)
# colchester has lots of roundabouts, and these are stored in 'osm_polygons'
# rather than 'osm_lines'. The former can be merged with the latter by:
dat2 <- osm_poly2line (dat)
} # }
# 'dat2' will have more lines than 'dat', but the same number of polygons
# (they are left unchanged.)