Package 'rosm'

Deprecated interface

Description

The previous interface for rosm was written to support idioms that are no longer prevalent in modren r-spatial code. These functions may continue to exist; however, their use is not encouraged and the functions may be removed in a future release.

Usage

as.tile_source(x, ...)

is.tile_source(x)

source_from_url_format(
  url_format,
  max_zoom = tile.maxzoom.default(),
  min_zoom = 0,
  attribution = NULL,
  extension = tools::file_ext(url_format[1]),
  ...
)

register_tile_source(...)

set_default_tile_source(x, ...)

get_default_tile_source()

osm.types()

bmaps.types()

bmaps.plot(bbox, type = "Aerial", key = NULL, ...)

extract_bbox(x, tolatlon = TRUE, ...)

osm.plot(
  bbox,
  zoomin = 0,
  zoom = NULL,
  type = NULL,
  forcedownload = FALSE,
  stoponlargerequest = TRUE,
  fusetiles = TRUE,
  cachedir = NULL,
  res = 150,
  project = TRUE,
  progress = c("text", "none"),
  quiet = TRUE,
  ...
)

osm.image(
  x,
  zoomin = 0,
  zoom = NULL,
  type = NULL,
  forcedownload = FALSE,
  cachedir = NULL,
  progress = c("text", "none"),
  quiet = TRUE
)

osm.raster(
  x,
  zoomin = 0,
  zoom = NULL,
  type = "osm",
  forcedownload = FALSE,
  cachedir = NULL,
  progress = c("text", "none"),
  quiet = TRUE,
  projection = NULL,
  crop = FALSE,
  filename = NULL,
  resample = "bilinear",
  ...
)

osm.points(x, y = NULL, epsg = 4326, toepsg = 3857, ...)

osm.segments(x0, y0, x1 = x0, y1 = y0, epsg = 4326, toepsg = 3857, ...)

osm.lines(x, y = NULL, epsg = 4326, toepsg = 3857, ...)

osm.polygon(x, y = NULL, epsg = 4326, toepsg = 3857, ...)

osm.text(x, y = NULL, labels = seq_along(x), epsg = 4326, toepsg = 3857, ...)

makebbox(n, e, s, w)

zoombbox(bbox, factor = 1, offset = c(0, 0))

Arguments

x, y, x0, y0, x1, y1, url_format, max_zoom, min_zoom, attribution, extension	Deprecated
...	Arguments passed to other methods
bbox	A bounding box as generated by sp::bbox()
type	A map type; one of that returned by osm.types. User defined types are possible by defining tile.url.TYPENAME <- function(xtile, ytile, zoom){} and passing TYPENAME as the type argument.
key, tolatlon, epsg, toepsg, labels, n, e, s, w, factor, offset	Deprecated
zoomin	The amount by which to adjust the automatically calculated zoom (or manually specified if the zoom parameter is passed). Use +1 to zoom in, or -1 to zoom out.
zoom	Manually specify the zoom level (not reccomended; adjust zoomin or res instead.
forcedownload	TRUE if cached tiles should be re-downloaded. Useful if some tiles are corrupted.
stoponlargerequest	By default osm.plot will only load 32 tiles at a time. If plotting at a higher resolution it may be necessary to pass true here.
fusetiles	TRUE if tiles should be fused into a single image. This is the default because white lines appear between tiles if it is set to FALSE. PDFs appear not to have this problem, so when plotting large, high resolution PDFs it may be faster (and more memory efficient) to use fusetiles=FALSE.
cachedir	The directory in which tiles should be cached. Defaults to getwd()/rosm.cache.
res	The resolution used to calculate scale.
project	TRUE if tiles should be projected to a pseudo-mercator projection, FALSE if lat/lon should be maintained. Becuase sp::plot adjusts the aspect according to latitude for lat/lon coordinates, this makes little difference at high zoom and may make plotting overlays more convenient. Defaults to TRUE.
progress	A progress bar to use, or "none" to suppress progress updates
quiet	Pass FALSE to see more error messages, particularly if your tiles do not download/load properly.
projection	A map projection in which to reproject the RasterStack as generated by CRS() or Spatial*@proj4string. If a Spatial* object is passed as the first argument, this argument will be ignored.
crop	TRUE if results should be cropped to the specified bounding box (see x), FALSE otherwise.
filename	A filename to which the raster should be written (see raster::writeRaster()). Use a ".tif" extension to write as a GeoTIFF.
resample	One of "ngb" (nearest neighbour) or "bilinear". Passed to projectRaster.

---

Check for Internet

Description

Used to skip tests and examples for this package when offline.

Usage

has_internet()

Value

TRUE if the internet is available, false otherwise

Examples

has_internet()

---

Coordinate helpers

Description

Coordinate helpers

Usage

osm_native(x, y)

osm_lnglat(lng, lat)

osm_crs_native()

osm_ensure_lnglat(pt)

osm_ensure_native(pt)

Arguments

x, y	Ordinate values in EPSG:3857 (Spherical Mercator in meters)
lng, lat	Coordinate values for longitude/latitude in degrees.
pt	A vector of points as coerced by [wk::as_xy()]. The CRS for these points is considered.

Value

- 'osm_native()', 'osm_lnglat()', 'osm_ensure_native()', and 'osm_ensure_lnglat()' return a [wk::xy()] with the appropriate crs - 'osm_crs_native()' returns a value that can be used as the [wk::wk_crs()] of a vector.

Examples

osm_lnglat(-64, 45)
osm_ensure_native(osm_lnglat(-64, 45))
osm_ensure_lnglat(
  osm_ensure_native(osm_lnglat(-64, 45))
)

---

Load an Open Street Map image

Description

Load an Open Street Map image

Usage

osm_raster(
  bbox,
  spec,
  zoom = osm_zoom_num_tiles(6),
  cache_spec = NULL,
  quiet = NA
)

Arguments

bbox	A [wk::rct()] or object with a [wk::wk_bbox()] method.
spec	An [osm_url_spec()]
zoom	A zoom level or an auto zoom specifier like [osm_zoom_num_tiles()].
cache_spec	An optional [osm_url_spec()] or character vector to be used as the cache.
quiet	Use 'TRUE' for fewer messages or 'FALSE' for more messages.

Value

A [wk::grd_rct()] whose data member is a nativeRaster.

Examples

bounds <- wk::rct(
  -7476083, 5349058,
  -6594103, 6243203,
  crs = osm_crs_native()
)

(grd <- osm_raster(bounds, osm_url_spec()))
plot(grd)

---

Low-level tile math

Description

Open Street Map operates using a system of tiles whose value and bounds are easily calculated from WGS84 longitude/latitude. These functions convert between tile system coordinates and longitude/latitude.

Usage

osm_tile(pt, zoom)

osm_tile_quadkey(tile)

osm_tile_top_left(tile, crs = osm_crs_native())

osm_tile_envelope(tile, crs = osm_crs_native())

Arguments

pt	A vector of points as coerced by [wk::as_xy()]. The CRS for these points is considered.
zoom	A zoom level, generally between 0 and 21, with higher values representing a smaller (i.e., more detailed) tile.
tile	A 'data.frame()' with columns 'x', 'y', and 'zoom'.
crs	A target CRS. Either [wk::wk_crs_longlat()] or [osm_crs_native()].

Value

- 'osm_tile()': A 'data.frame()' with columns 'x', 'y', and 'zoom'. - 'osm_tile_top_left()': A [wk::xy()] of the top-left (northwest) corner of the tile. - 'osm_tile_envelope()': A [wk::rct()] of the tile bounds.

Examples

(tiles <- osm_tile(osm_lnglat(-64, 45), zoom = 0:5))
osm_tile_envelope(tiles)

---

Get an OSM tile covering

Description

Get an OSM tile covering

Usage

osm_tile_covering(bbox, zoom = osm_zoom_num_tiles(6))

osm_zoom_num_tiles(num_tiles)

Arguments

bbox	A [wk::rct()] or object with a [wk::wk_bbox()] method.
zoom	A zoom level or an auto zoom specifier like [osm_zoom_num_tiles()].
num_tiles	The minimum number of tiles to use when choosing a zoom level.

Value

- 'osm_tile_covering()' returns a 'data.frame()' with columns x, y, and zoom.

Examples

bounds <- wk::rct(
  -7514064, 5009380,
  -6261722, 6261715,
  crs = osm_crs_native()
)

osm_tile_covering(bounds)

---

Resolve a tile into a URL

Description

Resolve a tile into a URL

Usage

osm_url(tile, spec)

Arguments

tile	A 'data.frame()' with columns 'x', 'y', and 'zoom'.
spec	An [osm_url_spec()]

Value

A character vector of URLs

Examples

bounds <- wk::rct(
  -7514064, 5009380,
  -6261722, 6261715,
  crs = osm_crs_native()
)

tiles <- osm_tile_covering(bounds, zoom = 6)
osm_url(tiles, osm_url_spec())

---

Load tile URLs

Description

Load tile URLs

Usage

osm_url_load_async(tile, spec, callback = NULL, cache_spec = NULL)

Arguments

tile	A 'data.frame()' with columns 'x', 'y', and 'zoom'.
spec	An [osm_url_spec()]
callback	A function to be run for each tile fetch or NULL to do nothing. The callback is always called with two arguments: the first is the subset of 'tile' for which this URL applies (typically one row but can be more than one in some corner cases); the second is the curl response object whose useful elements are url, status_code, type, and content.
cache_spec	An optional [osm_url_spec()] or character vector to be used as the cache.

Value

'tile', invisibly.

Examples

bounds <- wk::rct(
  252185, 4815826, 739729, 5210280,
  crs = "EPSG:32620"
)

tiles <- osm_tile_covering(bounds, zoom = 5)

osm_url_load_async(
  tiles,
  osm_url_spec_example(),
  function(tile, res) {
    str(tile)
    str(res)
  }
)

---

Tile URL Specification

Description

See <https://github.com/roblabs/xyz-raster-sources> for a number of useful values to use for 'server_url'.

Usage

osm_url_spec(
  server_url = "https://tile.openstreetmap.org/{z}/{x}/{y}.png",
  block_size = c(256, 256),
  min_zoom = 0,
  max_zoom = 18,
  content_type = NA_character_,
  name = NULL
)

osm_url_spec_example()

as_osm_url_spec(x, ..., name = NULL)

Arguments

server_url	A url using 'x', 'y', and 'z' for the x, y, and zoom level to be replaced. This can be any URL; non-URLs are assumed to be local file paths relative to the current working directory at the time of the download.
block_size	The pixel size of each image
min_zoom, max_zoom	The min/max zoom that this tile specification can handle
content_type	A MIME type or NA to guess the type from 'server_url'.
name	A name for this spec. Useful for cache specifications.
x	An object to convert to an osm_url_spec
...	Passed to S3 methods

Value

An object of class osm_url_spec.

Examples

osm_url_spec()

---

Set/Get the Default Tile Cache Location

Description

The default tile cache location is the "rosm.cache" folder in the current working directory, but for a variety of reasons it may be desirable to use one cache directory for all calls in a script. This must be called every time the namespace is loaded.

Usage

set_default_cachedir(cachedir)

get_default_cachedir()

Arguments

cachedir

A path to use as the cache directory (relative to the working directory). Use NULL to reset to the default.

Value

The previous cache directory, invisibly.

Examples

set_default_cachedir(tempfile())
get_default_cachedir()
(set_default_cachedir(NULL))

---