Provide national boundaries of a country.

Source: R/create.boundary.prevR.r

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.

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

if (FALSE) {
boundary <- create.boundary()
}
# \dontshow{
par(ask = TRUE)
# }
boundary <- create.boundary("Burkina Faso")
#> Source: World Borders Dataset 0.3 (2008)
#> Provided by Bjorn Sandvik, The dataset was derived by Schuyler Erle from public domain sources.
#> Sean Gilles did some clean up and made some enhancements.
#> The dataset is available under a Creative Commons Attribution-Share Alike License.
#> https://creativecommons.org/licenses/by-sa/3.0/
#> The boundaries, names designations used do not imply official endorsement or acceptance by the authors.

boundary <- create.boundary("Burkina Faso",
  proj = "+proj=utm +zone=30 +ellps=WGS84 +datum=WGS84 +units=m +no_defs"
)
#> Source: World Borders Dataset 0.3 (2008)
#> Provided by Bjorn Sandvik, The dataset was derived by Schuyler Erle from public domain sources.
#> Sean Gilles did some clean up and made some enhancements.
#> The dataset is available under a Creative Commons Attribution-Share Alike License.
#> https://creativecommons.org/licenses/by-sa/3.0/
#> The boundaries, names designations used do not imply official endorsement or acceptance by the authors.

boundary <- create.boundary(countries = c("Burkina Faso", "Ghana", "Benin"))
#> Source: World Borders Dataset 0.3 (2008)
#> Provided by Bjorn Sandvik, The dataset was derived by Schuyler Erle from public domain sources.
#> Sean Gilles did some clean up and made some enhancements.
#> The dataset is available under a Creative Commons Attribution-Share Alike License.
#> https://creativecommons.org/licenses/by-sa/3.0/
#> The boundaries, names designations used do not imply official endorsement or acceptance by the authors.

# \dontshow{
par(ask = FALSE)
# }