Download a shape file map — downloadMap • arear

This function downloads and caches a zipped shape file map, unpacks it, finds the correct shape file layer optionally simplifies it and converts it to `sf`.

Usage

downloadMap(zipUrl, mapName = NULL, simplify = FALSE, ...)

Arguments

zipUrl

the URL of the zipped shape file

mapName

(optional) the layer name or map name - this is `"xyz"` if a zip file contains `"xyz.shp"`. Usually there is one `.shp` file in a zip file, and by default it will be picked if this is not set.

simplify

do you want to simplify the map?

...

Named arguments passed on to .cached

.nocache: an option to defeat the caching which can be set globally as options("cache.disable"=TRUE)
.stale: the length of time in days to keep cached data before considering it as stale. can also be set by options("cache.stale")

Value

a `sf` object containing the map

Examples

if (FALSE) { # \dontrun{
downloadMap(
  zipUrl="https://bit.ly/3A9TnR1"
)
} # }