bbox_to_poly: Coerce a bounding box to a 'sfc' 'POLYGON' object

In nominatimlite: Interface with 'Nominatim' API Service

Coerce a bounding box to a sfc POLYGON object

Description

Create a sfc object from the coordinates of a bounding box.

Usage

bbox_to_poly(bbox = NA, xmin = NA, ymin = NA, xmax = NA, ymax = NA, crs = 4326)

Arguments

bbox	Numeric vector of 4 elements representing the coordinates of the bounding box. Values should be c(xmin, ymin, xmax, ymax).
xmin, ymin, xmax, ymax	Alternatively, you can use these named parameters instead of bbox.
crs	coordinate reference system, something suitable as input to st_crs

Details

Bounding boxes can be located using different online tools, as Bounding Box Tool.

Value

A sfc object of class POLYGON.

See Also

sf::st_as_sfc() and sf::st_sfc().

Get sf objects: geo_address_lookup_sf(), geo_amenity_sf(), geo_lite_sf(), geo_lite_struct_sf(), reverse_geo_lite_sf()

Examples

# bounding box of Germany
bbox_GER <- c(5.86631529, 47.27011137, 15.04193189, 55.09916098)

bbox_GER_sf <- bbox_to_poly(bbox_GER)


library(ggplot2)

ggplot(bbox_GER_sf) +
  geom_sf()

# Extract the bounding box of a sf object
sfobj <- geo_lite_sf("seychelles", points_only = FALSE)

sfobj

# Need at least one non-empty object
if (any(!sf::st_is_empty(sfobj))) {
  bbox <- sf::st_bbox(sfobj)

  bbox

  bbox_sfobj <- bbox_to_poly(bbox)

  ggplot(bbox_sfobj) +
    geom_sf(fill = "lightblue", alpha = 0.5) +
    geom_sf(data = sfobj, fill = "wheat")
}

nominatimlite documentation built on Sept. 11, 2024, 7:47 p.m.