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Download BDTOPO helper layers for manual georeferencing

get_georef_helpers.Rd

Download BDTOPO helper layers for manual georeferencing

Usage

get_georef_helpers(x, ..., filename = NULL, crs = 3857)

Arguments

x

Object of class sf or sfc

...

category names to select which helper layers to download:

  • "hydro": hydrography (nodes, river segments, lake, pond…)

  • "road": roads and railway lines)

  • "infra": linear / point / surface infrastructure

  • "building": building footprints

  • "other": miscellaneous landmarks (e.g. reference points)

filename

character or NULL; optional path to a file. If supplied, all downloaded layers are written to a single GeoPackage at this location. Extension is automatically forced to .gpkg.

crs

numeric or character; crs to convert layers to, see sf::st_transform

Value

A named list of sf objects.

Examples

if (FALSE) { # \dontrun{
library(sf)
x <- read_sf(system.file("extdata/penmarch.shp", package = "happign"))
hydro <- get_georef_helpers(x, "hydro")
all <- get_georef_helpers(x)

gpkg <- tempfile(fileext = ".gpkg")
save_to_gpkg <- get_georef_helpers(x, "road", "hydro", filename = gpkg)
} # }