Boundaries

This repo uses premade lookup tables to generate boundary data files used by Active Travel England. See the .qmd files for reproducible source code.

Regenerate the boundary files using the following code:

lad_to_lta_lookup = readr::read_csv("./local_authority_district_to_local_transport_authority_lookup.csv")
local_authority_geometries = sf::read_sf("https://services1.arcgis.com/ESMARspQHYMw9BZ9/arcgis/rest/services/Local_Authority_Districts_May_2023_UK_BUC_V2/FeatureServer/0/query?outFields=*&where=1%3D1&f=geojson")
local_authority_geometries_joined = dplyr::left_join(local_authority_geometries, lad_to_lta_lookup)
ltas = local_authority_geometries_joined |>
  dplyr::group_by(LTA23NM) |>
  dplyr::summarise(local_authority_names = paste0(LAD23NM, collapse = ", ")) |>
  dplyr::filter(LTA23NM != "") 
plot(ltas$geometry)

sf::write_sf(ltas, "./transport_authorities.geojson", delete_dsn = TRUE)
fs::file_size("./transport_authorities.geojson")

399K