data-raw/boundaries_lhb20.R

In britishredcrosssociety/geographr: R package for mapping UK geographies

# ---- Load ----
library(tidyverse)
library(httr)
library(sf)
library(rmapshaper)
library(lobstr)
library(devtools)

# Load package
load_all(".")

# Set query url
query_url <-
  query_urls |>
  filter(id == "lhb20") |>
  pull(query)

lhb <-
  read_sf(query_url)

lhb <-
  lhb |>
  st_transform(crs = 4326)

# Select and rename vars
lhb <-
  lhb |>
  select(
    lhb20_name = LHB20NM,
    lhb20_code = LHB20CD,
    geometry
  )

# Make sure geometries are valid
lhb <- st_make_valid(lhb)

# Simplify shape to reduce file size
lhb <- ms_simplify(lhb)

# Check geometry types are homogenous
if (lhb |>
  st_geometry_type() |>
  unique() |>
  length() > 1) {
  stop("Incorrect geometry types")
}

if (lhb |>
  st_geometry_type() |>
  unique() != "MULTIPOLYGON") {
  stop("Incorrect geometry types")
}

# Check object is below 50Mb GitHub warning limit
if (obj_size(lhb) > 50000000) {
  stop("File is too large")
}

# Rename
boundaries_lhb20 <- lhb

# Save output to data/ folder
usethis::use_data(boundaries_lhb20, overwrite = TRUE)