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get_geodata.R
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get_geodata.R
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# Packages -----------------------------------------------------------------------------
require(httr)
require(stringr)
# Functions ----------------------------------------------------------------------------
check_geolevel <- function(geolevel, available_geolevels) {
if (!geolevel %in% available_geolevels) stop("Please select valid 'geolevel'.")
}
check_api_call <- function(call_res) {
if (httr::http_error(call_res)) stop("The API does not respond properly. Do you have an internet connection and an open proxy?")
}
call_api_geodata <- function() {
# Call
res <- httr::GET("https://opendata.swiss/api/3/action/package_show?id=geodaten-zu-den-eidgenoessischen-abstimmungsvorlagen")
# Check
check_api_call(res)
# Return
return(res)
}
get_geodata <- function(geolevel = "municipality", latest = T, verbose = F, call_res) {
# Check input
check_geolevel(geolevel, available_geolevels = c("national", "canton", "district", "municipality", "zh_counting_districts", "lakes"))
# Call geodata api
if (missing(call_res)) call_res <- call_api_geodata()
cnt <- httr::content(call_res)
# Get info
if (latest) {
gdInfo <- cnt[["result"]][["resources"]][[2]][["title"]]
gdUrl <- cnt[["result"]][["resources"]][[2]][["download_url"]]
gdLayers <- sf::st_layers(gdUrl)[1][["name"]]
} else {
gdInfo <- cnt[["result"]][["resources"]][[1]][["title"]]
gdUrl <- cnt[["result"]][["resources"]][[1]][["download_url"]]
gdLayers <- sf::st_layers(gdUrl)[1][["name"]]
}
if (verbose) cat(paste0(gdInfo[!gdInfo == ""], collapse = "\n"), "\n\n")
# Load geodata and join votes
if (geolevel == "municipality") {
# Load
gd <- sf::st_read(gdUrl, layer = gdLayers[stringr::str_detect(gdLayers, "voge_")], quiet = T)
# Mutate if variable vogenr exists
if ("vogenr" %in% names(gd)) {
gd <- gd %>%
dplyr::mutate(id = vogenr) %>%
dplyr::select(-vogenr)
}
if ("vogeId" %in% names(gd)) {
gd <- gd %>%
dplyr::mutate(id = vogeId) %>%
dplyr::select(-vogeId)
}
# Adjust variable mun_id
gd <- gd %>%
dplyr::rename(mun_id = id) %>%
dplyr::mutate(mun_id = as.character(mun_id)) %>%
dplyr::select(mun_id, geometry)
}
if (geolevel == "district") {
# Load
gd <- sf::st_read(gdUrl, layer = gdLayers[stringr::str_detect(gdLayers, "bezk_")], quiet = T)
# Mutate if variable vogenr exists
if ("bezkId" %in% names(gd)) {
gd <- gd %>%
dplyr::mutate(id = bezkId) %>%
dplyr::select(-bezkId)
}
# Adjust variable district_id
gd <- gd %>%
dplyr::rename(district_id = id) %>%
dplyr::mutate(district_id = as.character(district_id)) %>%
dplyr::select(district_id, geometry)
}
if (geolevel == "canton") {
# Load
gd <- sf::st_read(gdUrl, layer = gdLayers[stringr::str_detect(gdLayers, "kant_")], quiet = T) %>%
dplyr::rename(canton_id = id) %>%
dplyr::rename(canton_name = name) %>%
dplyr::mutate(canton_id = as.character(canton_id)) %>%
dplyr::select(canton_id, geometry)
}
if (geolevel == "zh_counting_districts") {
gd <- sf::st_read(gdUrl, layer = gdLayers[stringr::str_detect(gdLayers, "zaelhlkreise_")], quiet = T) %>%
dplyr::rename(mun_id = id) %>%
dplyr::rename(mun_name = name) %>%
dplyr::mutate(mun_id = as.character(mun_id)) %>%
dplyr::select(mun_id, geometry)
}
if (geolevel == "lakes") {
gd <- sf::st_read(gdUrl, layer = gdLayers[stringr::str_detect(gdLayers, "seen_")], quiet = T) %>%
dplyr::select(id, geometry)
}
if (geolevel == "national") {
gd <- sf::st_read(gdUrl, layer = gdLayers[stringr::str_detect(gdLayers, "suis_")], quiet = T) %>%
dplyr::select(id, geometry)
}
# Return
return(gd)
}