create.boundary {prevR}

Provide national boundaries of a country.

Description

This function uses the data set TMWorldBorders. One or several countries can be selected and will be returned as an object of class sp::SpatialPolygons.

Usage

create.boundary(
  countries = NULL,
  multiple = FALSE,
  proj = "+proj=longlat +datum=WGS84"
)

Arguments

countries

a vector of character string corresponding to the name of the countries you want to extract from the dataset. If NULL, a dialogue box will be appear in order to select the desired country.

multiple

should the dialog box allow multiple selection (unused if countries is specified)?

proj

projection of clusters coordinates used in data (longitude and latitude in decimal degrees by default). One of (i) character: a string accepted by GDAL, (ii) integer, a valid EPSG value (numeric), or (iii) an object of class crs, see sf::st_crs().

Value

Object of class sp::SpatialPolygons.

Note

The result will be automatically plotted.

See Also

TMWorldBorders.

Examples

## Not run: 
boundary <- create.boundary()

## End(Not run)

boundary <- create.boundary("Burkina Faso")
boundary <- create.boundary("Burkina Faso",
  proj = "+proj=utm +zone=30 +ellps=WGS84 +datum=WGS84 +units=m +no_defs"
)
boundary <- create.boundary(countries = c("Burkina Faso", "Ghana", "Benin"))