as_sp: Convert osmar object to sp object

Description

Convert an osmar object to a sp object.

Usage

as_sp(obj, what = c("points", "lines", "polygons"), crs = osm_crs(), simplify = TRUE)

Arguments

obj

An osmar object

what

A string describing the sp-object; see Details section

crs

A valid CRS object; default value is given by osm_crs-function

simplify

Should the result list be simplified to one element if possible?

Value

A list of one or more sp objects; see Details section.

Details

Depending on the strings given in what the osmar object will be converted into in a list of objects given by the sp-package:

what = "points"

the object will be converted in a SpatialPointsDataFrame. The data slot is filled with the attrs slot of obj$nodes.

what = "lines"

the object will be converted in a SpatialLinesDataFrame. It is build with all possible elements which are in obj$ways obj$relations. The data slot is filled with elements of both.

what = "polygons"

the object will be converted in a SpatialPolygonsDataFrame. It consists of elements which are in obj$ways slot.

Every conversion needs at least a non-empty obj$nodes$attrs-slot because spatial information are stored in there.

Examples

Run this code

data("muc", package = "osmar")
  muc_points <- as_sp(muc, "points")
  muc_lines <- as_sp(muc, "lines")
  muc_polygons <- as_sp(muc, "polygons")

  bbox(muc_points)